CN115241738B - Gravity-type high-voltage pulse discharge switch for coaxial cylindrical deflagration drive - Google Patents

Abstract

The invention discloses a gravity type high-voltage pulse discharge switch for a coaxial cylindrical surface detonation driving device, which comprises an insulating cylinder, an insulating slide block, a first power supply positive terminal, a second power supply positive terminal, an ignition filament terminal and a power supply negative terminal; an insulating sliding block is arranged in the insulating cylinder, and a conductive terminal is arranged on the insulating sliding block; the first power supply positive terminal and the power supply negative terminal are both provided with first sliding contacts which are in contact with the conductive terminals; the second power supply positive terminal and the ignition filament terminal are both provided with second sliding contacts which are in contact with the conductive terminals; the first power supply positive terminal and the second power supply positive terminal are connected in parallel, and the first power supply positive terminal, the second power supply positive terminal and the power supply negative terminal are respectively and electrically connected with the high-voltage capacitor. The invention can ensure the time precision of millisecond level and realize the accurate control of the electrifying time.

Description

Gravity-type high-voltage pulse discharge switch for coaxial cylindrical deflagration drive

technical field

The invention relates to the technical field of high-temperature high-speed gas dynamics, high-speed aircraft and other experimental research, and more specifically, relates to a gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device.

Background technique

The shock tube/wind tunnel is a kind of experimental equipment widely used in the fields of high-temperature and high-speed aerodynamics, high-speed aircraft, etc. The basic principle is: the high-pressure driving gas compresses the low-pressure test gas through the shock wave to make it reach the required test state. As shown in Figure 1, a typical shock tube/wind tunnel includes a driving section 1', a driven section 2', a nozzle 3' and a test section 4'; before the test, the driving section 1' and the driven section 2' are The diaphragm 5' is separated, and the driving section 1' is filled with high-pressure driving gas, and the driven section 2' is filled with low-pressure test gas; during the test, the diaphragm 5' ruptures, and the high-pressure gas expands and enters the driven section 2'. At the same time, a fast-moving shock wave is generated in the driven section 2'; if the gas after the shock wave is directly used to carry out the test, the equipment operates in the shock tube mode; if the gas accelerated by the nozzle 3' is used The test gas is used to carry out the test, and the equipment operates in the shock tunnel mode.

The total temperature and total pressure range of the test gas are the main indicators to measure the capability of the equipment, both of which depend on the driving ability of the high-pressure driving gas. Normal temperature and high pressure gas can no longer meet the increasingly demanding test requirements. Therefore, three high-performance drive technologies have been developed at home and abroad: piston drive, heated light gas drive and detonation drive. Among them, the detonation drive technology has the characteristics of low cost, simple structure and relatively safe, and is currently the mainstream technology in China.

The detonation-driven shock tube was first proposed by Bird in 1957. Mr. Yu Hongru from the Institute of Mechanics, Chinese Academy of Sciences built a 13.3m long detonation-driven shock tube in 1981 and put it into use in 1983. The Institute of Mechanics of the Chinese Academy of Sciences developed the JF-10 detonation-driven high-enthalpy shock tunnel in 1994 [see Yu Hongru, Zhao Wei, Yuan Shengxue, Performance of Hydrogen-Oxygen Detonation-Driven Shock Tunnel - Aerodynamic Test and Measurement Control, 1993, 7(3):38-42]. With the help of Mr. Yu Hongru, Gronig and others built a high-enthalpy shock tunnel (TH2-D) driven by reverse detonation at RWTH Aachen University in Germany in 1993. In 1994, NASA modified the original free-piston-driven design, and built a forward detonation-driven high-enthalpy shock tunnel (HYPULSE) in GASL. The wind tunnel can work in both reflection shock tunnel mode and expansion tube Mode [see ChueRSM, Tsai C-Y, Bakos RJ, Erdos JI, Rogers RC (2002) NASA's HYPULSE Facility at GASL-ADual Mode, Dual Driver Reflected-Shock/Expansion Tunnel. In: Lu F, Marren D (eds), Advanced Hypersonic Test Facilities, Progress in Astronautics and Aeronautics, Vol.198, AIAA, Chapter 3, pp29-71].

The detonation drive needs to form a detonation wave propagating in the axial direction in the driving section, and the uneven flow field behind the detonation wave causes the following problems in this drive technology: First, the gas mixing ratio range that can be detonated is lower than that of the gas that can be detonated. The range of the test gas is much narrower, and the range of temperature and sound velocity of the driving gas is correspondingly narrower, thus limiting the total temperature range of the test gas that the detonation drive can provide; second, the effective driving pressure provided by the detonation drive does not exceed the pressure limit of the equipment 40% limits the total pressure range of the test gas.

Due to the above-mentioned problems in the detonation drive, the above-mentioned problems need to be overcome, and the coaxial cylindrical deflagration drive technology needs to be introduced. Arrange an ignition wire along the center line of the driving section axis, and use the discharge system to supply power to the ignition wire. Among them, the required high-voltage pulse power supply uses a high-voltage capacitor as an energy storage element, and the time required for the charge in the high-voltage capacitor to be completely released The duration (on the order of 10 ms) is long, and the combustion products contain a large amount of ions and water, which is very prone to breakdown. In order to ensure the safety of equipment and personnel, the power-on duration needs to be controlled in milliseconds and requires good repeatability; ordinary mechanical relays are difficult to meet the requirements, and solid-state relays based on semiconductor technology are expensive and easily damaged.

Existing document 1 (CN201911027930.5) discloses a pulse discharge switch structure for downhole operations, including a fixed electrode part, an adjustable electrode part, and an insulating layer; the fixed electrode part includes an upper terminal, a fixed electrode, an inner hexagonal clamp screw. The adjustable electrode part includes a lower terminal, an adjustable electrode, a fixing nut, a set screw and a set nut. The insulating layer includes an upper insulating layer, a middle insulating layer and a lower insulating layer, but this solution still does not meet the above requirements.

Existing document 2 (CN102407947A) discloses a shock tunnel detonation dual-drive device, comprising: a shock tunnel, the shock tunnel has a detonation driving section, and one end of the detonation driving section is provided with a detonation section, The other end is provided with a driven section; a first diaphragm is arranged between the detonation unloading section and the detonation driving section, and a second diaphragm is arranged between the driven section and the detonation driving section; A section of the detonation drive section close to the detonation section is provided with a forward detonation drive ignition device, and a section of the detonation drive section close to the driven section is provided with a reverse detonation drive ignition device; A controllable delay trigger device is connected between the forward detonation driven ignition device and the reverse detonation driven ignition device, and the method is as follows: 1) near the detonation unloading section of the shock wave wind tunnel detonation drive section A positive detonation ignition device is arranged at one end, and a reverse detonation driving ignition device is arranged at the end of the detonation driving section close to the driven section; 2) ignition is carried out by the forward detonation ignition device to form a forward driving detonation wave; 3) After the forward detonation wave propagates along the detonation driving section for a predetermined time, the ignition device is driven by the reverse detonation to ignite to form a reverse drive detonation wave; 4) The reverse drive detonation wave will be set at the driven The diaphragm between the detonation driving section and the detonation driving section is torn, and the forward detonation wave intersects with the reverse detonation wave to form a moving shock wave, which enters the driven section to conduct a compression.

In order to meet the coaxial cylinder deflagration drive technology, the present invention proposes a gravity type high voltage pulse discharge switch for coaxial cylinder deflagration drive device, and the gravity type high voltage pulse discharge switch for coaxial cylinder deflagration drive device It is not easy for those skilled in the art to think of.

Contents of the invention

In view of this, the present invention provides a gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device, including an insulating cylinder, an insulating slider, a positive terminal of the first power supply, a positive terminal of the second power supply, an ignition Filament terminal and power supply negative terminal;

The bottom end of the insulating cylinder is provided with a buffer pad;

An insulating slider is arranged in the insulating cylinder, and a conductive terminal is arranged on the side of the insulating slider near the buffer pad;

The positive terminal of the first power supply and the negative terminal of the power supply are respectively installed on the side of the insulating cylinder close to the buffer pad, and the positive terminal of the first power supply corresponds to the negative terminal of the power supply;

The positive terminal of the second power supply is installed on the side of the insulating cylinder close to the positive terminal of the first power supply and away from the buffer pad, and the terminal of the ignition wire is installed on the negative terminal of the insulating cylinder close to the negative terminal of the power supply. The post is far away from the side of the buffer pad, wherein the positive terminal of the second power supply corresponds to the terminal of the ignition filament;

Both the positive terminal of the first power supply and the negative terminal of the power supply are provided with a first sliding contact in contact with the conductive terminal, and the first sliding contact of the positive terminal of the first power supply passes through the conductive terminal. The terminal is electrically connected to the first sliding contact of the negative terminal of the power supply;

Both the positive terminal of the second power supply and the terminal of the ignition wire are provided with a second sliding contact in contact with the conductive terminal, and the second sliding contact of the positive terminal of the second power supply passes through the conductive terminal electrically connected to the second sliding contact of the ignition wire terminal;

The positive terminal of the first power supply and the positive terminal of the second power supply are connected in parallel, and the positive terminal of the first power supply, the positive terminal of the second power supply and the negative terminal of the power supply are respectively electrically connected to a high-voltage capacitor;

The shapes of the insulating cylinder and the insulating slider are cylinders respectively, and the cross-section of the cylinders along the first direction is circular or square;

The length of the insulating slider along a first direction is greater than the diameter of the insulating slider, and the first direction is a direction from the insulating slider to the buffer pad;

The height of the conductive terminal along the first direction is d1, the length between the first sliding contact and the second sliding contact along the first direction is d2, and the first sliding contact The length along the first direction between the buffer pad and the buffer pad is d3, wherein, d2>d1>d3.

Optionally, the first sliding contact includes a first sub-sliding contact connected to the positive terminal of the first power supply and a second sub-sliding contact connected to the negative terminal of the power supply;

The first sub-sliding contact includes a first contact segment and a first contact segment connected to the first contact segment, and the first contact segment is located at the first sub-sliding contact close to the first power supply On the side of the positive terminal, the first contact segment is located on the side of the first sub-sliding contact away from the positive terminal of the first power supply, the angle between the first contact segment and the first contact segment θ1, 180°>θ1>90°;

The second sub-sliding contact includes a second contact segment and a second contact segment connected to the second contact segment, and the second contact segment is located at the second sub-sliding contact close to the power supply On the side of the negative terminal, the second contact segment is located on the side of the second sub-sliding contact away from the negative terminal of the power supply, the angle between the second contact segment and the second contact segment θ2, 180°>θ2>90°;

Among them, θ1=θ2.

Optionally, the length between the first contact segment and the second contact segment along the second direction is slightly smaller than the diameter of the conductive terminal, wherein the slightly smaller range is 0.5-1 cm , the second direction intersects the first direction.

Optionally, the second sliding contact includes a third sub-sliding contact connected to the positive terminal of the second power supply and a fourth sub-sliding contact connected to the ignition filament terminal;

The third sub-sliding contact includes a third contact segment and a third contact segment connected to the third contact segment, and the third contact segment is located at the third sub-sliding contact close to the second power supply On the side of the positive terminal, the third contact segment is located on the side of the third sub-sliding contact away from the positive terminal of the second power supply, the angle between the third contact segment and the third contact segment θ3, 180°>θ3>90°;

The fourth sub-sliding contact includes a fourth contact segment and a fourth contact segment connected to the fourth contact segment, and the fourth contact segment is located at the fourth sub-sliding contact close to the ignition On the side of the filament terminal, the fourth contact segment is located on the side of the fourth sub-sliding contact away from the ignition filament terminal, and between the fourth contact segment and the fourth contact segment The included angle is θ4, 180°>θ4>90°; wherein, θ3=θ4.

Optionally, the length between the first contact segment and the second contact segment along the second direction is slightly smaller than the diameter of the conductive terminal; the third contact segment and the fourth contact The length between point segments along the second direction is slightly smaller than the diameter of the conductive terminal, wherein the slightly smaller range is 0.5-1 cm, and the second direction intersects the first direction.

Optionally, the length of the insulating slider along the first direction is 5-10 cm, and the diameter of the insulating slider is 3-4 cm.

Optionally, d1=2-3cm, d2=4-5cm, d3=1-2cm.

Optionally, the buffer pad is a foam pad, a rubber pad or an inflatable pad.

Optionally, the insulating slider is made of plastic, rubber or wood.

Compared with the prior art, the gravity-type high-voltage pulse discharge switch for the coaxial cylindrical deflagration driving device provided by the present invention at least achieves the following beneficial effects:

First, the power supply to the ignition wire is realized by connecting the positive pole of the high-voltage capacitor, the positive terminal of the second power supply, the second sliding contact, the conductive terminal and the terminal of the ignition wire in series, which can ensure the time accuracy of milliseconds and realize precise control of the power-on time. And through the positive pole of the high-voltage capacitor, the positive pole of the first power supply, the first sliding contact, the conductive terminal, the negative pole of the power supply, and the negative pole of the high-voltage capacitor in series, and at the same time, the positive pole of the first power supply is connected in parallel with the positive pole of the second power supply, so that the high voltage The residual charge in the capacitor is directly neutralized to ensure the safety of equipment and personnel;

Second, the buffer pad is used to prevent the rebound of the conductive terminal from causing the second sliding contact to be turned on again, so as to avoid accidental breakdown;

Third, through the cooperation of the insulating cylinder and the insulating slider, it can withstand high voltage of tens of thousands of volts, and the structure is strong, safe and reliable;

Fourth, the materials and processes used are relatively cheap, and the cost is much lower than that of solid state relays with the same voltage and current level.

Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned technical effects at the same time.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a structural schematic diagram of a shock tube/wind tunnel provided in the prior art;

Fig. 2 is a schematic structural diagram of a gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device provided by an embodiment of the present invention;

Figure 3 is an enlarged view of A in Figure 2;

Fig. 4 is a schematic structural diagram of a coaxial cylindrical deflagration driving device for a shock tube/wind tunnel provided by an embodiment of the present invention;

Figure 5 is an enlarged view of the structure at B in Figure 4;

Fig. 6 is a schematic structural diagram of a shock tube/wind tunnel provided by an embodiment of the present invention;

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

Fig. 2 is a schematic structural diagram of a gravity-type high-voltage pulse discharge switch used in a coaxial cylindrical deflagration drive device provided by an embodiment of the present invention; Fig. 3 is an enlarged view of A in Fig. 2; see Fig. 2 and Fig. 3, this The embodiment provides a gravity-type high-voltage pulse discharge switch 1000 for a coaxial cylindrical deflagration drive device, including an insulating cylinder 100, an insulating slider 200, a first power supply positive terminal 300, a second power supply positive terminal 400, an ignition Filament terminal 500 and power supply negative terminal 600;

The bottom end of the insulating cylinder 100 is provided with a buffer pad 101;

An insulating slider 200 is arranged inside the insulating cylinder 100, and a conductive terminal 201 is arranged on the side of the insulating slider 200 close to the buffer pad 101;

The first positive terminal 300 of the power supply and the negative terminal 600 of the power supply are respectively installed on the side of the insulating cylinder 100 close to the buffer pad 101, and the positive terminal 300 of the first power supply corresponds to the negative terminal 600 of the power supply;

The second power positive terminal 400 is installed on the side of the insulating cylinder 100 close to the first power positive terminal 300 away from the buffer pad 101, and the ignition wire terminal 500 is installed on the side of the insulating cylinder 100 close to the power negative terminal 600 away from the cushion 101. , wherein, the positive pole terminal 400 of the second power supply corresponds to the ignition wire pole terminal 500;

The first positive terminal 300 of the first power supply and the negative terminal 600 of the power supply are both provided with a first sliding contact 301 in contact with the conductive terminal 201. The first sliding contact 301 of the positive terminal 300 of the first power supply is connected to the power supply through the conductive terminal 201. The first sliding contact 301 of the negative terminal 600 is electrically connected;

The second positive terminal 400 of the second power supply and the terminal 500 of the ignition wire are both provided with a second sliding contact 401 in contact with the conductive terminal 201, and the second sliding contact 401 of the positive terminal 400 of the second power supply is connected to the conductive terminal 201. The second sliding contact 401 of the ignition filament terminal 500 is electrically connected;

The positive terminal 300 of the first power supply and the positive terminal 400 of the second power supply are connected in parallel, and are connected to the positive pole of the high-voltage capacitor 71 together; the negative terminal 600 of the power supply is connected to the negative pole of the high-voltage capacitor 71;

The shapes of the insulating cylinder 100 and the insulating slider 200 are cylinders respectively, and the cross-section of the cylinders along the first direction can be circular or square;

The length of the insulating slider 200 along the first direction E is greater than the diameter of the insulating slider 200, and the first direction E is the direction from the insulating slider 200 to the buffer pad 101;

The length of the conductive terminal 201 along the first direction E is d1, the length between the first sliding contact 301 and the second sliding contact 401 along the first direction E is d2, and the length between the first sliding contact 301 and the buffer pad 101 is d2. The length along the first direction E is d3, wherein, d2>d1>d3.

Specifically, the gravity-type high-voltage pulse discharge switch 1000 for a coaxial cylinder deflagration drive device includes an insulating cylinder 100, an insulating slider 200, a first power positive terminal 300, a second power positive terminal 400, and an ignition wire. The terminal 500 and the negative terminal 600 of the power supply, wherein the insulating cylinder 100 can be placed vertically or obliquely during use;

In order to make the positive and negative conduction time of the first power positive terminal 300 and the negative terminal 600 of the power supply long enough, a cushion 101 is arranged at the bottom of the insulating cylinder 100, and the cushion 101 is located in the insulating cylinder 100. 101 can be a foam pad, a rubber pad or an inflatable pad;

An insulating slider 200 is arranged in the insulating cylinder 100. The insulating slider 200 can slide the insulating slider 200 from the top, and accelerates to fall in the insulating cylinder 100 under the action of gravity. A conductive terminal 201 is provided, and the conductive terminal 201 can be a section of metal column, and the material of the insulating slider 200 is plastic, rubber or wood;

The first positive terminal 300 of the power supply and the negative terminal 600 of the power supply are respectively installed on the side of the insulating cylinder 100 close to the buffer pad 101, that is to say, the positive terminal 300 of the first power supply and the negative terminal 600 of the power supply are located at the bottom of the insulating cylinder 100, Wherein, the positive terminal 300 of the first power supply corresponds to the negative terminal 600 of the power supply;

The second power supply positive terminal 400 is installed on the side of the insulating cylinder 100 close to the first power positive terminal 300 and away from the buffer pad 101, and the ignition wire terminal 500 is installed on the side of the insulating cylinder 100 close to the power negative terminal 600 and away from the cushion 101. Wherein, the second power supply positive terminal 400 corresponds to the ignition filament terminal 500 , that is to say, the second power supply positive terminal 400 and the ignition filament terminal 500 are also located at the bottom of the insulating cylinder 100 ;

The first sliding contact 301 in contact with the conductive terminal 201 is arranged on the positive terminal 300 of the first power supply and the negative terminal 600 of the power supply, and the first sliding contact 301 of the positive terminal 300 of the first power supply passes through the conductive terminal 201 It is electrically connected with the first sliding contact 301 of the negative terminal 600 of the power supply, that is to say: the first sliding contact 301 of the positive terminal 300 of the first power supply, the conductive terminal 201 and the first sliding contact of the negative terminal 600 of the power supply 301 is connected in series;

Both the positive terminal 400 of the second power supply and the terminal 500 of the ignition wire are provided with a second sliding contact 401 in contact with the conductive terminal 201, and the second sliding contact 401 of the positive terminal 400 of the second power supply passes through the conductive terminal 201. It is electrically connected with the second sliding contact 401 of the ignition wire terminal 500, that is to say: the second sliding contact 401 of the second power positive terminal 400, the conductive terminal 201 and the second sliding contact of the ignition wire terminal 500 The contacts 401 are connected in series;

The first positive terminal 300 of the power supply and the positive terminal 400 of the second power supply are connected in parallel. 500 is electrically connected to the positive pole of the ignition wire 13, and the negative terminal 600 of the power supply is electrically connected to the negative pole of the high-voltage capacitor 71, and the high-voltage capacitor 71 is used to store high-voltage electricity and discharge to the ignition wire;

The shapes of the insulating cylinder 100 and the insulating slider 200 are cylinders respectively, and the cross section of the cylinder along the first direction can be circular or square, and the cross section can also adopt other shapes. In this example, the insulating cylinder 100 and the insulating slider 200 are both is a cylinder;

In order to prevent the conductive terminal 201 from turning over during the falling process, the length of the insulating slider 200 along the first direction E is greater than the diameter of the insulating slider 200, and the first direction E is the direction from the insulating slider 200 to the buffer pad 101, such as The length of the insulating slider 200 along the first direction E may be 5-10 cm, and the diameter of the insulating slider 200 may be 3-4 cm;

The height of the conductive terminal 201 along the first direction E is d1, the length between the first sliding contact 301 and the second sliding contact 401 along the first direction E is d2, and the distance between the first sliding contact 301 and the buffer pad 101 is The length along the first direction E is d3, wherein, d2>d1>d3, that is to say, the distance between the first sliding contact 301 and the second sliding contact 401 is the largest, and the distance between the first sliding contact 301 and the buffer The distance between the pads 101 along the first direction E is slightly smaller than the height d1 of the conductive terminal 201, such as d1=2-3cm, d2=4-5cm, d3=1-2cm, specifically, such as d1=3, d2=5 , d3=2, or d1=2, d2=5, d3=1, the values of d1, d2 and d3 can be adjusted according to the actual situation, so that the conductive terminal 201 stays directly at the negative pole of the power supply without rebounding On the first sliding contact 301 of the binding post 600 , and then the positive and negative terminals of the first power supply positive terminal 300 and the power supply negative terminal 600 are conducted for a long enough time.

During specific use, the insulating cylinder 100 can be placed vertically or obliquely; first, the first power supply positive pole terminal 300 and the second power supply positive pole terminal 400 are electrically connected to the positive pole of the high voltage capacitor 71 respectively, and the ignition wire pole terminal 500 is connected to the positive pole of the high voltage capacitor 71. The positive pole of the ignition wire 13 is electrically connected, and the negative terminal 600 of the power supply is electrically connected with the negative pole of the high-voltage capacitor 71; the insulating slider 200 is dropped from the top, and the insulating slider 200 is accelerated to fall under the action of gravity; when the conductive terminal 201 and the second When the positive terminal 400 of the power supply is in contact with the second sliding contact 401 on the terminal 500 of the ignition wire, the positive pole of the high-voltage capacitor is connected to the positive pole of the ignition wire 13, and the power supply supplies power to the ignition wire 13; as the conductive terminal 201 continues to fall, The conductive terminal 201 is separated from the second sliding contact 401, and the power supply to the ignition wire 13 is stopped; later on, the conductive terminal 201 contacts the first sliding contact 301 on the positive terminal 300 of the first power supply and the negative terminal 600 of the power supply. When the positive and negative poles of the power supply are connected, the remaining charge in the capacitor is directly neutralized. Since the cushion pad 101 is provided at the bottom of the insulating cylinder 100, the conductive terminal 201 stays directly on the first sliding contact 301 without rebounding. , so that the positive and negative terminals of the first power supply positive terminal 300 and the power supply negative terminal 600 are conducted for a long enough time; time.

Compared with the prior art, the gravity-type high-voltage pulse discharge switch for the coaxial cylindrical deflagration driving device provided by the present invention at least achieves the following beneficial effects:

First, the ignition wire is powered by connecting the positive pole of the high-voltage capacitor 71, the positive terminal 400 of the second power supply, the second sliding contact 401, the conductive terminal 201, and the terminal 500 of the ignition wire in series, which can ensure millisecond-level time accuracy and realize Precisely control the power-on time, and connect the positive pole of the high-voltage capacitor 71, the positive pole of the first power supply 300, the first sliding contact 301, the conductive terminal 201, the negative pole of the power supply 600, and the negative pole of the high-voltage capacitor in series, and at the same time, the positive pole of the first power supply 300 It is connected in parallel with the positive terminal 400 of the second power supply, so that the residual charge in the high-voltage capacitor 71 can be directly neutralized, thereby ensuring the safety of equipment and personnel;

Second, the buffer pad 101 is used to prevent the conductive terminal 201 from rebounding and causing the second sliding contact 401 to conduct again, so as to avoid accidental breakdown;

Third, through the cooperation of the insulating cylinder 100 and the insulating slider, it can withstand a high voltage of tens of thousands of volts, and the structure is strong, safe and reliable;

Fourth, the materials and processes used are relatively cheap, and the cost is much lower than that of solid state relays with the same voltage and current level.

In an optional embodiment of the present invention, the first sliding contact 301 includes a first sub-sliding contact 302 connected to the positive terminal 300 of the first power supply and a second sub-sliding contact 302 connected to the negative terminal 600 of the power supply. sliding contact 303;

The first sub-sliding contact 302 includes a first contact segment 304 and a first contact segment 305 connected to the first contact segment 304, the first contact segment 304 is located at the first sub-sliding contact 302 close to the first power supply On the positive terminal 300 side, the first contact segment 305 is located on the side of the first sub-sliding contact 302 away from the positive terminal 300 of the first power supply, the angle between the first contact segment 304 and the first contact segment 305 θ1, 180°>θ1>90°;

The second sub-sliding contact 303 includes a second contact segment 306 and a second contact segment 307 connected to the second contact segment 306. The second contact segment 306 is located at the second sub-sliding contact 303 and is close to the negative pole of the power supply. On the side of the column 600, the second contact segment 307 is located on the side of the second sub-sliding contact 303 away from the negative terminal 600 of the power supply, and the angle between the second contact segment 306 and the second contact segment 307 is θ2, 180 °＞θ2＞90°;

Among them, θ1=θ2.

Specifically, the first sliding contact 301 includes a first sub-sliding contact 302 and a second sub-sliding contact 303, the first sub-sliding contact 302 is connected to the positive terminal 300 of the first power supply, and the second sub-sliding contact 303 is connected with the power negative terminal 600;

The first sub-sliding contact 302 includes a first contact segment 304 and a first contact segment 305, the first contact segment 305 is connected to the first contact segment 304, the first contact segment 304 is located at the first sub-sliding contact The point 302 is close to the side of the positive terminal 300 of the first power supply, the first contact section 305 is located on the side of the first sub-sliding contact 302 away from the positive terminal 300 of the first power supply, the first contact section 304 is connected to the first contact section The angle between 305 is θ1, 180°>θ1>90°, that is to say, the first contact segment 305 is in direct contact with the conductive terminal 201, and the distance between the first contact segment 304 and the first contact segment 305 is obtuse angle, the first contact segment 305 is inclined downward, and the included angle θ1 faces the buffer pad 101;

The second sub-sliding contact 303 includes a second contact segment 306 and a second contact segment 307, the second contact segment 306 is connected to the second contact segment 307, and the second contact segment 306 is located at the second sub-sliding contact. The point 303 is close to the side of the negative terminal 600 of the power supply, the second contact segment 307 is located on the side of the second sub-sliding contact 303 away from the negative terminal 600 of the power supply, the distance between the second contact segment 306 and the second contact segment 307 The included angle is θ1, 180°>θ2>90°; that is to say: the second contact segment 307 is in direct contact with the conductive terminal 201, the second contact segment 306 and the second contact segment 307 form an obtuse angle, and the second The contact segment 307 is inclined downward, and the included angle θ2 faces the buffer pad 101, and the first contact segment 305 and the second contact segment 307 are mirror-symmetrically arranged; wherein, θ1=θ2, adopting this scheme, it is possible to make The insulating slider 200 of 201 slides down smoothly.

In an optional embodiment of the present invention, the second sliding contact 401 includes a third sub-sliding contact 402 connected to the positive terminal 400 of the second power supply and a fourth sub-sliding contact connected to the terminal 500 of the ignition filament. Sub sliding contact 403;

The third sub-sliding contact 402 includes a third contact segment 404 and a third contact segment 405 connected to the third contact segment 404, the third contact segment 404 is located at the third sub-sliding contact 402 close to the second power supply On the positive terminal 400 side, the third contact segment 405 is located on the side of the third sub-sliding contact 402 away from the positive terminal 400 of the second power supply, the angle between the third contact segment 404 and the third contact segment 405 θ3, 180°>θ3>90°;

The fourth sub-sliding contact 403 includes a fourth contact segment 406 and a fourth contact segment 407 connected to the fourth contact segment 406, the fourth contact segment 406 is located at the fourth sub-sliding contact 403 close to the ignition wire On the side of the terminal 500, the fourth contact segment 407 is located on the side of the fourth sub-sliding contact 403 away from the ignition wire terminal 500, and the angle between the fourth contact segment 406 and the fourth contact segment 407 is θ4 , 180°>θ4>90°; where, θ3=θ4.

Specifically, the second sliding contact 401 includes a third sub-sliding contact 402 and a third sub-sliding contact 403, the third sub-sliding contact 402 is connected to the second power supply positive terminal 400, and the fourth sub-sliding contact 403 is connected with the ignition filament terminal 500;

The third sub-sliding contact 402 includes a third contact segment 404 and a third contact segment 405, the third contact segment 404 is connected to the third contact segment 405, and the third contact segment 404 is located at the third sub-sliding contact The point 402 is close to the side of the positive terminal 400 of the second power supply, the third contact section 405 is located on the side of the third sub-sliding contact 402 away from the positive terminal 400 of the second power supply, the third contact section 404 is connected to the third contact section The included angle between 405 is θ3, 180°>θ3>90°, that is to say, the third contact segment 405 is in direct contact with the conductive terminal 201, and the distance between the third contact segment 404 and the third contact segment 405 is obtuse angle, the third contact segment 405 is inclined downward, and the included angle θ3 faces the buffer pad 101;

The fourth sub-sliding contact 403 includes a fourth contact segment 406 and a fourth contact segment 407, the fourth contact segment 406 and the fourth contact segment 407 are connected, and the fourth contact segment 406 is located at the fourth sub-sliding contact The point 403 is close to the side of the ignition wire terminal 500, the fourth contact segment 407 is located on the side of the fourth sub-sliding contact 403 away from the ignition wire terminal 500, between the fourth contact segment 406 and the fourth contact segment 407 The angle between them is θ4, 180°>θ4>90°; that is to say: the fourth contact segment 407 is in direct contact with the conductive terminal 201, and the angle between the fourth contact segment 406 and the fourth contact segment 407 is an obtuse angle. The fourth contact segment 407 is inclined downward, and the included angle θ4 faces the buffer pad 101; wherein, θ3=θ4, and the fourth contact segment 407 and the fourth contact segment 407 are arranged symmetrically as mirror images. Using this scheme, the belt with The insulating slider 200 of the conductive terminal 201 slides down smoothly. Since the cushion pad 101 is provided at the bottom of the insulating cylinder 100, the positive and negative conduction time between the first power positive terminal 300 and the power negative terminal 600 can be long enough, so that The conductive terminal 201 stagnates at the second sliding contact 401 , so as to better neutralize the residual charge in the capacitor.

In an optional embodiment of the present invention, the length d4 along the second direction F between the third contact segment 405 and the fourth contact segment 407 is slightly smaller than the diameter of the conductive terminal 201, wherein the range of slightly smaller than is 0.5-1cm; if it is less than 0.5cm, the third contact segment 405 and the fourth contact segment 407 are not in sufficient contact with the conductive terminal 201, and if it is greater than 1cm, the conductive terminal 201 cannot slide down smoothly; The range of less than 0.5-1cm, the second direction F intersects the first direction E, of course, the length d5 of the first contact segment 305 and the second contact segment 307 along the second direction F is also slightly smaller than that of the conductive terminal 201 The diameter, which is slightly smaller than 0.5-1cm, if it is less than 0.5cm, then the contact between the first contact segment 305 and the second contact segment 307 and the conductive terminal 201 is insufficient; if it is larger than 1cm, the conductive terminal 201 It cannot slide down smoothly; therefore, limiting the range slightly smaller than 0.5-1cm can make the first contact segment 305 and the second contact segment 307 more fully contact with the conductive terminal 201, so that the positive and negative poles of the power supply can be connected. The remaining charge in the capacitor is directly neutralized; the third contact segment 405 and the fourth contact segment 407 are more fully in contact with the conductive terminal 201, so that the positive pole of the high-voltage capacitor is connected to the positive pole of the ignition wire 13, and the power supply is connected to the ignition wire 13 powered by.

Fig. 4 is a schematic structural view of a coaxial cylindrical deflagration driving device for a shock tube/wind tunnel provided by an embodiment of the present invention; Fig. 5 is an enlarged view of the structure at B in Fig. 4; as shown in Fig. 4-Fig. 5 As shown, this embodiment provides a coaxial cylindrical deflagration driving device for a shock tube/wind tunnel, including a deflagration driving section 1, a driven section 2, and is used to separate the deflagration driving section 1 from the driven section 2 Diaphragm 5, blind plate 14 and discharge system 7, wherein one end of the deflagration driving section 1 is connected to the driven section 2, and the other end is connected to the blind plate 14;

The deflagration driving section 1 is a straight tube with equal cross-section. The first electrode 11 and the second electrode 12 extending along the radial direction Y are inserted into the deflagration driving section 1. The first electrode 11 is located on the side of the deflagration driving section close to the blind plate 14. The two electrodes 12 are located on the side of the deflagration driving section 1 close to the driven section 2, and the ignition wire 13 extending along the axial direction X is electrically connected between the first electrode 11 and the second electrode 12, and the axial direction X is directed by the deflagration driving section 1. The direction of the shaft centerline of the driven section 2, where the radial direction Y intersects the axial direction X;

Along the axis X, the length between the first electrode 11 and the blind plate 14 is L1, the length between the second electrode 12 and the diaphragm 5 is L2, and the lengths of L1 and L2 are limited to 0.5cm-20cm;

The deflagration driving section 1 is provided with an opening 8 matching the first electrode 11 and the second electrode 12, and a sealing ring 81 is provided on the contact surface of the first electrode 11, the second electrode 12 and the opening 8;

The deflagration driving section 1 is filled with combustible gas mixture;

The discharge system 7 includes a gravity-type high-voltage pulse discharge switch 1000 and a high-voltage capacitor 71. The gravity-type high-voltage pulse discharge switch 1000 includes an insulating cylinder 100, an insulating slider 200, a first power supply positive terminal 300, a second power supply positive terminal 400, an ignition Filament pole terminal 500 and power supply negative pole terminal 600, the gravity type high voltage pulse discharge switch 1000 is the above gravity type high voltage pulse discharge switch 1000 for the coaxial cylindrical deflagration driving device;

The positive pole of the high-voltage capacitor 71, the positive terminal 400 of the second power supply, the second sliding contact 401, the conductive terminal 201, the terminal 500 of the ignition wire pole, the first electrode 11, the ignition wire 13, the second electrode 12, and the negative pole of the high-voltage capacitor 71 Constitute an ignition circuit; the unloading circuit is composed of the positive pole of the high-voltage capacitor 71, the positive pole of the first power supply 300, the first sliding contact 301, the conductive terminal 201, the negative pole of the power supply 600, and the negative pole of the high-voltage capacitor 71, and the positive pole of the first power supply 300 is connected in parallel with the positive terminal 400 of the second power supply, and the high voltage capacitor 71 is used to store high voltage electricity and discharge it to the ignition wire, wherein the high voltage capacitor 71 can generate a high voltage of 2000V.

Specifically, the coaxial cylindrical deflagration driving device for a shock tube/wind tunnel includes a deflagration driving section 1 and a driven section 2. One end of the deflagration driving section 1 is connected to the driven section 2, and the other end is connected to a blind plate 14. A diaphragm 5 is set between the driving section 1 and the driven section 2, the driven section 2 is connected to the test section 4 through the nozzle 3, the blind plate 14 is a flange cover, and the end of the deflagration driving section 1 is blocked by the blind plate 14, It is no longer necessary to use the traditional deflagration section and to set a diaphragm between the deflagration section and the deflagration driving section, which not only helps to reduce the occupied space, but also reduces the cost;

A first electrode 11 and a second electrode 12 extending along the radial direction Y are plugged into the deflagration driving section 1. The first electrode 11 is located on the side of the deflagration driving section 1 close to the blind plate 14, and the second electrode 12 is located on the side of the deflagration driving section 1 close to the blind plate 14. One side of the driven section 2, that is to say, the first electrode 11 and the second electrode 12 are plugged into the two ends of the deflagration driving section 1; between the first electrode 11 and the second electrode 12 is electrically connected a The ignition wire 13, the axial direction X is the direction from the blind plate 14 to the axis centerline of the driven section 2, and the radial direction Y intersects the axial direction X. Optionally, the ignition wire 13 can be made of copper, silver, nickel chromium, Any metal material in tungsten and alloy, the length of the ignition wire 13 is adjusted according to the length of the deflagration driving section 1;

The axial distance between the first electrode 11 and the blind plate 14 is L1, and the axial distance between the second electrode 12 and the diaphragm 5 is L2. If the length of L1 and L2 is less than 0.5 cm, breakdown may occur, resulting in equipment damage or Dangerous to personnel safety; if the length of L1 and L2 is greater than 20cm, it may lead to unstable combustion of the combustible gas mixture in the deflagration driving section 1. Therefore, the length of L1 and L2 is limited to 0.5cm-20cm, not only the ignition wire 13 is arranged longer in the axial direction in the deflagration driving section, which can further make the combustion of the combustible gas mixture in the deflagration driving section 1 more complete, and can avoid the gap between the first electrode 11 and the end of the deflagration driving section and the second electrode. The distance between 12 and diaphragm 5 is too short to avoid breakdown and ensure the safety of equipment and personnel;

On the deflagration driving section 1, there is an opening 8 matched with the first electrode 11 and the second electrode 12. In Fig. 5, in order to show the opening 8 on the figure, the aperture of the opening 8 is drawn larger than the actual one, The opening 8 is matched with the first electrode 11, and the second electrode 12 is matched with the opening 8. Through the opening 8, the first electrode 11 and the second electrode 12 are conveniently plugged into the combustion driving section 1. In order to ensure that the deflagration driving section 1, after the first electrode 11 is plugged into the deflagration driving section 1, a sealing ring 81 is provided on the contact surface of the deflagration driving section 1 where the first electrode 1 contacts the opening 8, and a sealing ring 81 is provided between the second electrode 12 and the deflagration driving section 1. A sealing ring 81 is provided on the contact surface of the deflagration driving section 1 that is in contact with the opening 8;

The deflagration driving section 1 is filled with a combustible gas mixture, which can include fuel, oxidant and inert gas, wherein the fuel is hydrogen, carbon monoxide or alkenyne, and can also be other combustible gases; the oxidant is oxygen or dioxide Nitrogen can also be other oxidizing gases, and inert gases can be nitrogen, rare gases or carbon dioxide, or other gases that do not participate in combustion reactions; the ratio of fuel: oxidant: inert gas can be 1:1:1, fuel : The ratio between oxidant: inert gas can also be 2:1:1, the ratio between fuel: oxidant: inert gas can also be 2:1:7, and the ratio of fuel, oxidant and inert gas is based on experiments require determination;

The discharge system 7 includes a gravity-type high-voltage pulse discharge switch 1000 and a high-voltage capacitor 71. The gravity-type high-voltage pulse discharge switch 1000 includes an insulating cylinder 100, an insulating slider 200, a first power supply positive terminal 300, a second power supply positive terminal 400, an ignition Filament pole terminal 500 and power supply negative pole terminal 600, the gravity type high voltage pulse discharge switch 1000 is the above gravity type high voltage pulse discharge switch 1000 for the coaxial cylindrical deflagration driving device;

Specifically, the bottom end of the insulating cylinder 100 is provided with a buffer pad 101; the insulating cylinder 100 is provided with an insulating slider 200, and the insulating slider 200 is provided with a conductive terminal 201 on the side close to the buffer pad 101; the positive terminal of the first power supply 300 and power supply negative terminal 600 are respectively installed on the side of the insulating cylinder 100 close to the buffer pad 101, the first power supply positive terminal 300 corresponds to the power supply negative terminal 600; the second power supply positive terminal 400 is installed on the insulation cylinder 100 close to the second A power supply positive terminal 300 is away from the side of the buffer pad 101, and an ignition wire terminal 500 is installed on the side of the insulating cylinder 100 close to the power negative terminal 600 away from the cushion 101, wherein the second power supply positive terminal 400 is connected to the ignition wire The terminal 500 corresponds to the terminal 300 of the first power supply and the negative terminal 600 of the power supply. The conductive terminal 201 is electrically connected to the first sliding contact 301 of the power negative terminal 600; the second power positive terminal 400 and the ignition wire terminal 500 are both provided with a second sliding contact 401 in contact with the conductive terminal 201 , the second sliding contact 401 of the positive pole terminal 400 of the second power supply is electrically connected to the second sliding contact 401 of the ignition wire terminal 500 through the conductive terminal 201;

The positive pole of the high-voltage capacitor 71, the positive terminal 400 of the second power supply, the second sliding contact 401, the conductive terminal 201, the terminal 500 of the ignition wire pole, the first electrode 11, the ignition wire 13, the second electrode 12, and the negative pole of the high-voltage capacitor 71 Constitute an ignition circuit; the unloading circuit is composed of the positive pole of the high-voltage capacitor 71, the positive pole of the first power supply 300, the first sliding contact 301, the conductive terminal 201, the negative pole of the power supply 600, and the negative pole of the high-voltage capacitor 71, and the positive pole of the first power supply 300 is connected in parallel with the positive pole terminal 400 of the second power supply, that is to say, the ignition circuit is connected in parallel with the unloading circuit; the high-voltage capacitor 71 is used to store high-voltage electricity and discharge it to the ignition wire.

After the high-voltage capacitor 71 is charged, when the conductive terminal 201 is in contact with the second sliding contact 401 on the second power supply positive terminal 400 and the ignition wire terminal 500, the positive pole of the high-voltage capacitor 71 is connected to the first electrode 11, and the high-voltage capacitor 71 Supply power to the ignition wire 13; as the conductive terminal 201 continues to fall, the conductive terminal 201 is separated from the second sliding contact 401, and the power supply to the ignition wire 13 is stopped; The first sliding contact 301 on the power supply negative pole terminal 600 is in contact. At this time, the positive and negative poles of the power supply are connected, and the residual charge in the capacitor is directly neutralized to complete the unloading. The above-mentioned predetermined time can be 5-30 milliseconds.

The assembly sequence for this Coaxial Cylindrical Deflagration Drive for Shock Tube/Wind Tunnel is as follows:

Provide deflagration driving section 1;

Firstly, the opening 8 for placing the first electrode 11 and the second electrode 12 is provided on the deflagration driving section 1; secondly, a sealing ring 81 is installed on the contact surface between the first electrode 11 and the second electrode 12 and the opening 8, and then Insert the first electrode 11 and the second electrode 12 in the opening 8, the first electrode 11 is located on the side of the deflagration driving section close to the blind plate 14, and the second electrode 12 is located on the side of the deflagration driving section 1 close to the driven section 2, insert After connecting the first electrode 11 and the second electrode 12; then connect the ignition wire 13 extending along the axial direction X between the first electrode 11 and the second electrode 12;

A diaphragm is installed between the deflagration driving section 1 and the driven section 2, and one end of the deflagration driving section 1 close to the diaphragm 5 is connected to the driven section 2, and the other end is connected to a blind plate 14;

The deflagration driving section 1 is filled with combustible gas mixture;

Assemble the discharge system 7, electrically connect the positive terminal 300 of the first power supply and the positive terminal 400 of the second power supply to the positive pole of the high-voltage capacitor 71, the terminal 500 of the ignition wire is electrically connected to the first electrode 11, and the second electrode 12 is connected to the high-voltage capacitor 71. The negative electrode of the capacitor 71 is electrically connected, and the first positive terminal 300 of the power supply is connected in parallel with the positive terminal 400 of the second power supply. The ignition wire terminal 500, the first electrode 11, the ignition wire 13, the second electrode 12, and the negative pole of the high-voltage capacitor 71 constitute an ignition circuit; The conductive terminal 201, the negative pole terminal 600 of the power supply, and the negative pole of the high-voltage capacitor 71 constitute an unloading circuit.

Assembling the coaxial cylindrical deflagration driving device for the shock tube/wind tunnel according to the above assembly sequence can not only better insert the first electrode and the second electrode, but also make the position of the ignition wire 13 more accurate. Moreover, it can avoid leakage of combustible gas mixture, ensure personal safety, and is convenient for operation.

Of course, without considering the discharge of the high-voltage capacitor to the ignition wire, the above-mentioned assembly sequence can be adjusted appropriately. After the driven section 2 or the blind plate 14 is installed, the discharge system 7 can be assembled first, and then the deflagration driving section 1 can be assembled. It is filled with combustible gas mixture, as follows:

First, provide a deflagration driving section 1;

Second, at first, on the deflagration driving section 1, there are openings 8 for placing the first electrode 11 and the second electrode 12; secondly, a sealing ring is installed on the contact surface between the first electrode 11 and the second electrode 12 and the opening 8 81, and then insert the first electrode 11 and the second electrode 12 in the opening 8, the first electrode 11 is located on the side of the deflagration driving section close to the blind plate 14, and the second electrode 12 is located on the side of the deflagration driving section 1 close to the driven section 2 side, after plugging the first electrode 11 and the second electrode 12; then connecting the ignition wire 13 extending along the axial direction X between the first electrode 11 and the second electrode 12;

Thirdly, a diaphragm is installed between the deflagration driving section 1 and the driven section 2, and one end of the deflagration driving section 1 close to the diaphragm 5 is connected to the driven section 2, and the other end is connected to a blind plate 14;

Fourth, assemble the discharge system 7, electrically connect the positive terminal 300 of the first power supply and the positive terminal 400 of the second power supply to the positive pole of the high-voltage capacitor 71, the terminal 500 of the ignition wire is electrically connected to the first electrode 11, and the second electrode 12 is electrically connected to the negative pole of the high-voltage capacitor 71, and the positive terminal 300 of the first power supply is connected in parallel with the positive terminal 400 of the second power supply, wherein the positive pole of the high-voltage capacitor 71, the positive terminal 400 of the second power supply, the second sliding contact 401, Terminal 201, ignition wire terminal 500, first electrode 11, ignition wire 13, second electrode 12, and high-voltage capacitor 71 negative constitute an ignition circuit; The point 301, the conductive terminal 201, the negative terminal 600 of the power supply, and the negative pole of the high-voltage capacitor 71 form an unloading circuit;

Fifth, the deflagration driving section 1 is filled with combustible gas mixture.

It should be noted that: first, a deflagration driving section 1 is provided; secondly, firstly, openings 8 for placing the first electrode 11 and the second electrode 12 are provided on the deflagration driving section 1; secondly, the first electrode 11 and the A sealing ring 81 is installed on the contact surface between the second electrode 12 and the opening 8, and then the first electrode 11 and the second electrode 12 are inserted in the opening 8. The first electrode 11 is located at the side of the deflagration drive section close to the blind plate 14, and the second The second electrode 12 is located on the side of the deflagration driving section 1 close to the driven section 2, after the first electrode 11 and the second electrode 12 are plugged in; then the first electrode 11 and the second electrode 12 are connected between the first electrode 11 and the second electrode 12. Ignition wire 13; Third, a diaphragm is installed between the deflagration driving section 1 and the driven section 2, and one end of the deflagration driving section 1 close to the diaphragm 5 is connected to the driven section 2, and the other end is connected to a blind plate 14; the above three The assembly sequence of the steps is irreversible, that is, the above assembly sequence cannot be reversed, and it cannot be implemented after being reversed.

The working principle is as follows: in the deflagration driving section 1 there is an ignition wire 13 arranged along the axial direction X. After the high-voltage capacitor 71 is charged, the ignition circuit is closed first, and the high-voltage capacitor 71 passes through the first electrode 11 and the second electrode 12 and the ignition wire 13 When the ignition wire 13 is turned on, a high voltage of thousands to tens of thousands of volts is applied to both ends of the ignition wire 13. When the ignition circuit is energized, the ignition wire 13 heats up violently, and the combustible gas mixture near the ignition wire 13 is ignited within a time of microseconds. Finally, a columnar flame surface is formed and expanded in the radial direction; by making the ignition wire 13 strictly coaxial with the pipeline of the deflagration driving section 1, it is guaranteed to burn out everywhere in the axial direction; because the discharge process of the high-voltage capacitor 71 is longer than the combustion process , it is necessary to unload the remaining charge in the high-voltage capacitor 71 before the end of combustion, so after a predetermined period of time, close the unloading circuit and short-circuit the positive and negative poles of the high-voltage capacitor 71, and the charge in the high-voltage capacitor 71 will pass through the unloading circuit instantaneously Return to the high-voltage capacitor 71 to complete unloading, thereby preventing the breakdown of combustion products near the positive electrode of the high-voltage capacitor 71 and causing safety accidents.

It should be noted that the detonation drive needs to form a detonation wave propagating axially in the pipeline of the driving section, while the deflagration drive is to ignite the gas in the pipeline of the deflagration driving section 1 simultaneously in the axial direction, so as to detonate instead of detonate. The combustion is completed in a bombing manner, and the combustion is simultaneously completed along the axis X.

Generally, the effective working time of the shock tube/wind tunnel is on the order of a few milliseconds to 100 milliseconds. In order to provide accurate test conditions, it is necessary to strictly ensure that the combustible gas mixture in the deflagration driving section is ignited and burned out at the same time.

It can be seen from the above embodiments that the coaxial cylindrical deflagration driving device for shock tube/wind tunnel provided by the present invention at least achieves the following beneficial effects:

First, in the prior art, the detonation drive forms a detonation wave propagating axially in the pipeline of the driving section. Since the extremely high pressure peak of the detonation wave cannot be used for driving, the effective pressure provided by the detonation drive is much lower. Due to the pressure limit of the equipment, detonation is replaced by detonation in the present invention, there is no pressure peak in detonation, and the combustion pressure can be 100% used to compress the test gas, thus increasing the pressure of the test gas;

Second, the mixture ratio limit of deflagration is much wider than that of detonation, and the range of temperature and sound velocity of the driving gas is larger, and the corresponding total temperature range of the test gas is therefore larger than that of detonation driving.

Third, the power supply to the ignition wire is realized through the positive pole of the high-voltage capacitor, the positive terminal of the second power supply, the second sliding contact, the conductive terminal and the terminal of the ignition wire in series, which can ensure the time accuracy of milliseconds and realize precise control of the power-on time. And through the positive pole of the high-voltage capacitor, the positive pole of the first power supply, the first sliding contact, the conductive terminal, the negative pole of the power supply, and the negative pole of the high-voltage capacitor in series, and at the same time, the positive pole of the first power supply is connected in parallel with the positive pole of the second power supply, so that the high voltage The residual charge in the capacitor is directly neutralized to ensure the safety of equipment and personnel;

Fourth, the conductive terminal stays directly on the first sliding contact with almost no rebound through the buffer pad, which avoids accidental breakdown caused by the conductive terminal turning on the ignition circuit again.

Fig. 6 is a schematic structural diagram of a shock tube/wind tunnel provided by an embodiment of the present invention; an embodiment of the present invention also has a shock tube/wind tunnel, including a shock tube/wind tunnel provided by an embodiment of the present invention The coaxial cylindrical deflagration drive device.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (9)

1. A gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device, characterized in that it comprises an insulating cylinder, an insulating slider, a positive terminal of the first power supply, a positive terminal of the second power supply, and an ignition wire Binding post and negative terminal of power supply; The bottom end of the insulating cylinder is provided with a buffer pad; An insulating slider is arranged in the insulating cylinder, and a conductive terminal is arranged on the side of the insulating slider near the buffer pad; The positive terminal of the first power supply and the negative terminal of the power supply are respectively installed on the side of the insulating cylinder close to the buffer pad, and the positive terminal of the first power supply corresponds to the negative terminal of the power supply; The positive terminal of the second power supply is installed on the side of the insulating cylinder close to the positive terminal of the first power supply and away from the buffer pad, and the terminal of the ignition wire is installed on the negative terminal of the insulating cylinder close to the negative terminal of the power supply. The post is far away from the side of the buffer pad, wherein the positive terminal of the second power supply corresponds to the terminal of the ignition filament; Both the positive terminal of the first power supply and the negative terminal of the power supply are provided with a first sliding contact in contact with the conductive terminal, and the first sliding contact of the positive terminal of the first power supply passes through the conductive terminal. The terminal is electrically connected to the first sliding contact of the negative terminal of the power supply; Both the positive terminal of the second power supply and the terminal of the ignition wire are provided with a second sliding contact in contact with the conductive terminal, and the second sliding contact of the positive terminal of the second power supply passes through the conductive terminal electrically connected to the second sliding contact of the ignition wire terminal; The positive terminal of the first power supply and the positive terminal of the second power supply are connected in parallel, and the positive terminal of the first power supply, the positive terminal of the second power supply and the negative terminal of the power supply are respectively electrically connected to a high-voltage capacitor; The shapes of the insulating cylinder and the insulating slider are cylinders respectively, the cross section of the cylinder along the first direction is circular or square, and the length of the insulating slider along the first direction is longer than that of the insulating slider. Diameter, the first direction is the direction from the insulating slider to the buffer pad; The height of the conductive terminal along the first direction is d1, the length between the first sliding contact and the second sliding contact along the first direction is d2, and the first sliding contact The length along the first direction between the buffer pad and the buffer pad is d3, wherein, d2>d1>d3. 2. The gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device according to claim 1, wherein the first sliding contact includes a positive terminal connected to the first power supply. a first sub-sliding contact and a second sub-sliding contact connected to the negative terminal of the power supply; The first sub-sliding contact includes a first contact segment and a first contact segment connected to the first contact segment, and the first contact segment is located at the first sub-sliding contact close to the first power supply On the side of the positive terminal, the first contact segment is located on the side of the first sub-sliding contact away from the positive terminal of the first power supply, the angle between the first contact segment and the first contact segment θ1, 180°>θ1>90°; The second sub-sliding contact includes a second contact segment and a second contact segment connected to the second contact segment, and the second contact segment is located at the second sub-sliding contact close to the power supply On the side of the negative terminal, the second contact segment is located on the side of the second sub-sliding contact away from the negative terminal of the power supply, the angle between the second contact segment and the second contact segment θ2, 180°>θ2>90°; Among them, θ1=θ2. 3. The gravity-type high-voltage pulse discharge switch for a coaxial cylinder deflagration drive device according to claim 2, characterized in that, between the first contact segment and the second contact segment along the second The length in the direction is slightly smaller than the diameter of the conductive terminal, wherein the range of the slightly smaller is 0.5-1 cm, and the second direction intersects the first direction. 4. The gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device according to claim 2, wherein the second sliding contact includes a positive terminal connected to the second power supply. a third sub-sliding contact and a fourth sub-sliding contact connected to the ignition filament terminal; The third sub-sliding contact includes a third contact segment and a third contact segment connected to the third contact segment, and the third contact segment is located at the third sub-sliding contact close to the second power supply On the side of the positive terminal, the third contact segment is located on the side of the third sub-sliding contact away from the positive terminal of the second power supply, the angle between the third contact segment and the third contact segment θ3, 180°>θ3>90°; The fourth sub-sliding contact includes a fourth contact segment and a fourth contact segment connected to the fourth contact segment, and the fourth contact segment is located at the fourth sub-sliding contact close to the ignition On the side of the filament terminal, the fourth contact segment is located on the side of the fourth sub-sliding contact away from the ignition filament terminal, and between the fourth contact segment and the fourth contact segment The included angle is θ4, 180°>θ4>90°; wherein, θ3=θ4. 5. The gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device according to claim 4, characterized in that, between the first contact segment and the second contact segment along the second The length in the direction is slightly smaller than the diameter of the conductive terminal; the length in the second direction between the third contact segment and the fourth contact segment is slightly smaller than the diameter of the conductive terminal, wherein the A slightly smaller range is 0.5-1cm, and the second direction intersects the first direction. 6. The gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device according to claim 1, wherein the length of the insulating slider along the first direction is 5-10 cm, and the insulating slider is 5-10 cm long. The diameter of the slider is 3-4cm. 7. The gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device according to claim 1, characterized in that d1=2-3cm, d2=4-5cm, d3=1-2cm. 8. The gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration driving device according to claim 1, wherein the buffer pad is a foam pad, a rubber pad or an inflatable pad. 9. The gravity-type high-voltage pulse discharge switch for a coaxial cylindrical deflagration drive device according to any one of claims 1-8, wherein the material of the insulating slider is plastic, rubber or wood.

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