CN112867219A - Underwater pulse discharge plasma exciter and flow control method - Google Patents
Underwater pulse discharge plasma exciter and flow control method Download PDFInfo
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- CN112867219A CN112867219A CN202110224509.4A CN202110224509A CN112867219A CN 112867219 A CN112867219 A CN 112867219A CN 202110224509 A CN202110224509 A CN 202110224509A CN 112867219 A CN112867219 A CN 112867219A
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- 230000015556 catabolic process Effects 0.000 claims description 9
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- 230000009471 action Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
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- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Spectroscopy & Molecular Physics (AREA)
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Abstract
The invention discloses an underwater pulse discharge plasma exciter which comprises an insulating substrate and a high-voltage-resistant cable, wherein a channel and a pore channel are processed on the insulating substrate, a first insulating layer and a second insulating layer which are grouped are installed in the channel in a matched mode, a discharge electrode slice is clamped between the first insulating layer and the second insulating layer, a discharge slit is formed between one end, far away from the bottom of the channel, of the discharge electrode slice and the first insulating layer and between the first insulating layer and the second insulating layer, one end of the high-voltage-resistant cable is connected with the discharge electrode slice in a sealing mode after passing through the pore channel and the first insulating layer, and the other end of the high-voltage. The invention also discloses a flow control method of the underwater pulse discharge plasma exciter, and the flow control is realized by using the underwater pulse discharge plasma exciter. The invention has stable flow control effect and is beneficial to the large-scale use of the plasma exciter.
Description
Technical Field
The invention relates to a plasma exciter, in particular to an underwater pulse discharge plasma exciter and a flow control method.
Background
The flow control is one of the methods for realizing the resistance reduction and the noise reduction of the underwater vehicle, and has an important function for improving the working performance of the underwater vehicle.
At present, the flow control method for underwater vehicle mainly includes active and passive methods. The active flow control method includes a wall surface electromagnetic force method, a porous wall suction/blow method, a wall surface heating/cooling method, a flexible deformable wall surface method, and the like; passive flow control includes: bionic wall surface method, surfactant method, optimum appearance design method, etc.
The underwater flow control technology and method still have a plurality of technical problems and restrict the deep development of the underwater flow control and the practical application and deployment of engineering. For example, as a classical passive flow control method, compared with an active control method, a bionic wall surface drag reduction and noise reduction method has insufficient adaptability to a flow field, and generally cannot be adjusted along with the change of an incoming flow working condition, and the drag reduction efficiency may decrease under a high maneuvering working condition. The surfactant drag reduction mainly faces closed pipeline flow, and when the surfactant drag reduction agent is applied to drag reduction of an underwater vehicle, the problem of surfactant loss is faced, continuous addition is needed, and the consumption is overlarge. The bubble/air curtain/supercavitation technology has the problems of bubble escape, difficult generation and maintenance of bubbles in deep water, low energy utilization rate and the like, and particularly has the problems that partial bubbles and cavitation bubbles near a machine body are difficult to stabilize and control when an underwater vehicle yaws and has high maneuverability, the resistance reduction capability is suddenly reduced, the noise level is improved and the like, so that the improvement of the underwater maneuverability and the survival capability is restricted. In addition, the previous experimental research indicates that the normal electromagnetic force control method has obvious resistance reduction effect only at a lower Reynolds number, and the resistance reduction is not obvious at a higher Reynolds number, so that the application range of the method is influenced.
Disclosure of Invention
The invention aims to provide an underwater pulse discharge plasma exciter and a flow control method, and aims to solve the problems of insufficient adaptability to a flow field, high control difficulty and narrow application range of the existing underwater flow control technology and method.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an underwater pulse discharge plasma exciter, includes insulating substrate and high voltage resistant cable, insulating substrate processing has channel and pore, the adaptation is installed in the channel is organized first insulating layer and second insulating layer, it accompanies a discharge electrode piece to adorn between first insulating layer and the second insulating layer, the one end that the channel bottom was kept away from to the discharge electrode piece is formed with the discharge slit between first insulating layer and the second insulating layer, the one end of high voltage resistant cable is connected with discharge electrode piece sealing behind pore and the first insulating layer, high voltage pulse source is connected to the other end of high voltage resistant cable.
Preferably, an edge of the discharge electrode sheet is a surface having a radius of curvature.
Preferably, positioning fastening screws made of an electrically insulating material are arranged among the first insulating layer, the discharge electrode plate and the second insulating layer at intervals, the first insulating layer is provided with a first positioning hole, the bottom of the channel is provided with a bulge matched with the first positioning hole, and the discharge electrode plate is provided with a second positioning hole matched with the positioning fastening screws.
Preferably, the walls of the channels and ducts are pre-coated with a waterproof sealant.
Preferably, the discharge slit has a line groove shape or a ring groove shape.
Preferably, the plasma exciters are arranged on the underwater vehicle test model in an array along the flowing direction or the spreading direction, and the exposed surfaces of the plasma exciters are flush with the outer wall surface of the underwater vehicle test model.
Another object of the present invention is to provide a flow control method for an underwater pulse discharge plasma exciter, applied to the plasma exciter, including:
the plasma exciter is installed in a mounting groove prefabricated by an underwater vehicle experimental model, a discharge electrode plate is connected with the anode of a high-voltage pulse source through a high-voltage resistant cable, and the metal conductive wall surface of the underwater vehicle experimental model is connected with the cathode or the grounding electrode of the high-voltage pulse source; after the current is switched on, the field intensity generated in the discharge slit enables the residual micro bubble medium in the discharge slit to be firstly subjected to discharge breakdown, and further causes the water medium in the discharge slit to be subjected to discharge breakdown, so that a pulse discharge plasma region is formed in the discharge slit; and after the last discharge period is finished, supplementing the water body medium in the discharge slit, and remaining the micro bubbles to realize the flow control in the pulse discharge process.
The invention has the beneficial technical effects that:
the underwater pulse discharge plasma exciter is constructed by using the discharge slit, so that stable pulse discharge can be realized in the discharge slit and a nearby flow field, a regulation and control effect can be generated on the flow nearby the wall surface of the underwater navigation body, and an active control means is provided for realizing flow control and resistance reduction; the width of the discharge slit is small, the edge of the discharge electrode slice is thin, a high discharge electric field can be generated, the discharge can be promoted, and the discharge difficulty is reduced; the underwater pulse discharge plasma exciter is composed of an insulating layer and a discharge electrode plate, so that modularization, integration and high-precision assembly are facilitated, the array arrangement and batch production manufacturing of the underwater pulse discharge plasma exciter are facilitated, and large-area and large-volume stable generation of underwater plasma can be realized; the exciter has low requirements on water quality, can realize stable discharge in tap water and deionized water, and provides convenience for the operation of the underwater vehicle in various water environments; the underwater pulse discharge plasma exciter is driven by an external high-voltage pulse power supply to perform discharge work, and the average power required by a single exciter module is low, so that the large-scale use of the exciter is facilitated; the discharge slits of the underwater pulse discharge plasma exciter can be arranged in various forms such as a linear groove form or a ring groove form, and the like, so that the exciter arrangement requirements of test models with different shapes and test models with complex wall surface structures are fully met.
Drawings
Fig. 1 is a schematic layout of an application scenario of an underwater pulse discharge plasma exciter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an underwater pulse discharge plasma exciter according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the underwater pulse discharge plasma exciter of FIG. 2, which is partially cut along a horizontal direction;
fig. 4 is a schematic structural diagram of the underwater pulse discharge plasma exciter of fig. 2, which is partially cut along a vertical direction.
Detailed Description
The invention is described in further detail below with reference to the following figures and embodiments:
reference numerals in the drawings of the specification include: the underwater vehicle test model comprises an underwater vehicle test model 1, a steel wire 2, a plasma exciter 3, an insulating substrate 4, a first insulating layer 5, a discharge electrode plate 6, a second insulating layer 7, a wire core 8 of a high-voltage-resistant cable, an insulating layer 9 of the high-voltage-resistant cable, a positioning fastening screw 10, a first positioning hole 11 and a second positioning hole 12.
As shown in fig. 1, the plasma exciter 3 is installed in a mounting groove prefabricated on the wall surface of the underwater vehicle test model 1, the exposed surface of the plasma exciter 3 is flush with the outer wall surface of the underwater vehicle test model 1, for simplicity, only one plasma exciter 3 is shown in the figure, and the plasma exciter can be developed according to the flow field characteristics and the geometric layout characteristics of the underwater vehicle test model 1, is arranged in an array along the flow direction or the span direction, and realizes the concurrent or sequential output of the array of the plasma exciter 3 under the action of an external synchronous trigger control signal, so as to achieve a better active flow control effect. The underwater vehicle test model 1 is suspended on a water tunnel test section through a steel wire 2 and is used for carrying out related test tests of the plasma exciter 3.
As shown in fig. 2, 3 and 4, an underwater pulse discharge plasma exciter 3 comprises an insulating substrate 4 and a high-voltage-resistant cable, wherein the insulating substrate 4 is made of an electrical insulating material with good thermochemical stability and is a frame for supporting the whole underwater pulse discharge plasma exciter 3, a channel and a pore channel are processed on the insulating substrate 4, a group of first insulating layer 5 and a group of second insulating layer 7 are installed in the channel in a matched mode, a discharge electrode piece 6 is clamped between the first insulating layer 5 and the second insulating layer 7, and a discharge slit is formed between one end, far away from the bottom of the channel, of the discharge electrode piece 6 and the first insulating layer 5 and the second insulating layer 7.
In order to ensure the waterproof sealing effect, the walls of the channel and the duct in the insulating substrate 4 can be coated with waterproof sealant in advance, and then the first insulating layer 5, the second insulating layer 7 and the high-voltage-resistant cable are installed.
The first insulating layer 5 and the second insulating layer 7 are a group of two structural blocks made of electric insulating materials, and in order to avoid influencing underwater pulse discharge, except for the discharge slit part, the matching surfaces among the first insulating layer 5, the second insulating layer 7 and the discharge electrode slice 6 should avoid water from entering.
The sum of the thicknesses of the first insulating layer 5, the second insulating layer 7 and the discharge electrode plate 6 is equal to the width of the channel of the insulating substrate 4, so that the first insulating layer 5 and the second insulating layer 7 can be installed in the channel of the insulating substrate 4 of the exciter in an adaptive mode after the discharge electrode plate 6 is clamped tightly, an overlarge fit clearance is avoided, and the influence on a near-wall-surface flow field of the underwater vehicle test model 1 is reduced.
The discharging electrode slice 6 is a thin slice made of metal stainless steel, the thickness of the thin slice meets the requirement of an electric field for generating breakdown discharge in the discharging slit, and the edge of the discharging electrode slice 6 can form a surface with a curvature radius by a precision machining method to enhance a partial discharge electric field; the sizes of the first insulating layer 5 and the second insulating layer 7 are larger than that of the discharge electrode sheet 6, so that after the bottom ends of the discharge electrode sheet 6, the first insulating layer 5 and the second insulating layer 7 are aligned, the heights of the upper ends of the first insulating layer 5 and the second insulating layer 7 are higher than that of the upper end of the discharge electrode sheet 6, and the first insulating layer 5, the second insulating layer 7 and the discharge electrode sheet 6 jointly form a discharge slit.
One end of the high-voltage resistant cable is hermetically connected with the discharge electrode plate 6 after passing through the pore channel and the first insulating layer 5, the other end of the high-voltage resistant cable is connected with the anode of a high-voltage pulse source to provide the high-voltage pulse source for the discharge electrode plate 6, and the high-voltage pulse source is composed of a wire core of the high-voltage resistant cable inside and an insulating layer of the high-voltage resistant cable wrapped outside, so that waterproof and electric insulation are realized.
Positioning and fastening screws 10 made of electric insulation materials are arranged among the first insulation layer 5, the discharge electrode plate 6 and the second insulation layer 7 at intervals and used for positioning and fastening the first insulation layer 5, the second insulation layer 7 and the discharge electrode plate 6, and size and shape maintenance of a discharge slit is achieved. The positioning fastening screw 10 is made of an electrically insulating material so as to prevent the discharge electrode plate 6 from being directly and electrically communicated with an external water medium through a metal fastener. The first insulating layer 5 is provided with a first positioning hole 11, the bottom of the channel is provided with a bulge matched with the first positioning hole 11, and the discharge electrode plate 6 is provided with a second positioning hole 12 matched with the positioning fastening screw 10.
The grounding electrode is a metal conductive wall surface of the underwater vehicle experimental model, is connected with a negative electrode or a grounding electrode of the high-voltage pulse source, and establishes a partial discharge electric field between the high-voltage pulse source and the discharge electrode slice 6 after the high-voltage pulse source is electrified so as to realize high-voltage pulse discharge breakdown of media in the discharge slit and nearby the discharge slit; the minimum distance between the grounding electrode and the discharge electrode plate 6 in the discharge slit meets the requirement of electrical parameters of discharge breakdown.
The discharge slit is in a wire groove shape, and can also be designed into various shapes such as a ring groove shape and the like, so that the arrangement requirements of test models in different shapes are met. The inside of the discharge slit is aqueous medium, when the discharge electrode plate 6 is not connected with a high-voltage power supply, most of the inside of the discharge slit is aqueous medium, and trace bubbles are remained; when the discharge electrode plate 6 is connected with a high-voltage power supply, because the wall surface is a grounding electrode, strong field intensity is generated in the discharge slit, so that trace bubble media remained in the discharge slit are firstly subjected to discharge breakdown, and then the water body media in the whole slit are subjected to discharge breakdown, so that a pulse discharge plasma region is formed in the discharge slit; and after the last discharge period is finished, supplementing the water body medium in the discharge slit, continuously remaining the micro bubbles, preparing for the discharge of the next period, and reciprocating the pulse discharge process to realize flow control.
After the plasma exciter 3 is assembled, waterproof sealing test and high-voltage loading test are firstly carried out in the water tank, the underwater vehicle test model 1 is installed in a prefabricated installation groove after normal discharge work is ensured, and the high-voltage-resistant cable is led out from the part which has the smallest influence on the flow field to be tested of the underwater vehicle test model 1.
When the plasma exciter 3 is tested for the first time, the parameter setting of the high-voltage pulse power source should follow the principle of 'small energy, short pulse and low repetition frequency', the discharge energy and the discharge intensity are gradually increased, if necessary, a numerical simulation method can be adopted to predict reasonable and matched discharge parameters, and the plasma exciter 3 is prevented from being damaged due to over-concentration of the discharge energy.
The plasma exciter 3 can be used for testing the near-wall flow control effect of the underwater vehicle test model 1, flow field observation can be carried out by adopting flow display methods such as a laser-induced fluorescence method, a hydrogen bubble method, a laser interference method, a particle imaging speed measurement method and the like, and resistance change caused by flow control can also be evaluated by adopting a balance direct measurement method.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (7)
1. An underwater pulse discharge plasma exciter, characterized in that: including insulating base and high voltage resistant cable, insulating base processing has channel and pore, grouped first insulating layer and second insulating layer are installed to the adaptation in the channel, it has a discharge electrode piece to fit between first insulating layer and the second insulating layer, the discharge electrode piece is kept away from and is formed with the discharge slit between the one end of channel bottom and first insulating layer and the second insulating layer, the one end of high voltage resistant cable is through pore and first insulating layer after with discharge electrode piece sealing connection, high voltage pulse source is connected to the other end of high voltage resistant cable.
2. An underwater pulse discharge plasma exciter according to claim 1, characterised in that: the edge of the discharge electrode sheet is a surface with a curvature radius.
3. An underwater pulse discharge plasma exciter according to claim 1, characterised in that: positioning fastening screws made of electric insulation materials are arranged among the first insulation layer, the discharge electrode plate and the second insulation layer at intervals, a first positioning hole is formed in the first insulation layer, a protrusion matched with the first positioning hole is formed in the bottom of the channel, and a second positioning hole matched with the positioning fastening screws is formed in the discharge electrode plate.
4. An underwater pulse discharge plasma exciter according to claim 1, characterised in that: and the wall surfaces of the channel and the pore passage are coated with waterproof sealant in advance.
5. An underwater pulse discharge plasma exciter according to claim 1, characterised in that: the discharge slit is in a shape of a wire groove or a ring groove.
6. An underwater pulse discharge plasma exciter according to any one of claims 1 to 5, characterised in that: the plasma exciters are arranged on the underwater vehicle test model in an array along the flow direction or the spreading direction, and the exposed surfaces of the plasma exciters are flush with the outer wall surface of the underwater vehicle test model.
7. A flow control method of an underwater pulse discharge plasma exciter, which is applied to the plasma exciter according to any one of claims 1 to 6, comprising: the plasma exciter is installed in a mounting groove prefabricated by an underwater vehicle experimental model, a discharge electrode plate is connected with the anode of a high-voltage pulse source through a high-voltage resistant cable, and the metal conductive wall surface of the underwater vehicle experimental model is connected with the cathode or the grounding electrode of the high-voltage pulse source; after the current is switched on, the field intensity generated in the discharge slit enables the residual micro bubble medium in the discharge slit to be firstly subjected to discharge breakdown, and further causes the water medium in the discharge slit to be subjected to discharge breakdown, so that a pulse discharge plasma region is formed in the discharge slit; and after the last discharge period is finished, supplementing the water body medium in the discharge slit, and remaining the micro bubbles to realize the flow control in the pulse discharge process.
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| 朱本华;梁磊;程尧;段丕轩;耿子海;: "天平自动校准架复位测量的关键技术研究", 兵工自动化, no. 12, 15 December 2009 (2009-12-15) * |
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