CN116123564B - A Velocity Staggered Micro-mixing Nozzle Structure and Combustion Chamber - Google Patents

Abstract

The invention relates to the technical field of jet propulsion, and provides a micro-mixing nozzle structure and a combustion chamber with staggered speeds. The micro-mixing nozzle structure includes a mounting seat and a first nozzle unit; the first nozzle unit is located on the mounting seat; the first nozzle unit includes a plurality of pre-mixed microtubes at a reference position and a plurality of pre-mixed micro-tubes at a staggered position; a plurality of reference positions The premixed microtubes and multiple staggered premixed microtubes are arranged side by side, and the multiple staggered premixed microtubes are arranged between the multiple reference position premixed microtubes; The outlet end of the mixing microtube is flush; the jet velocity of the mixed gas is different between the outlet end of the staggered premixing microtube and the outlet end of the reference position premixing microtube, so as to realize the premixing of the staggered premixing microtube and the reference position Staggering of flame delay times for microtubules. In the present invention, different premixed microtubes are staggered according to the jet flow velocity, so as to realize the staggered arrangement of the flame delay time of different premixed microtubes, effectively suppress combustion oscillation, and ensure the stability of flame combustion.

Description

A Velocity Staggered Micro-mixing Nozzle Structure and Combustion Chamber

technical field

The invention relates to the technical field of jet propulsion, in particular to a micro-mixing nozzle structure and a combustion chamber with staggered velocities.

Background technique

In the field of jet propulsion, such as aeroengines, fuel and oxidant are mixed and burned in the combustion chamber to provide high-temperature gas as power for the aircraft. Therefore, the nozzle mixing design and combustion organization in the combustion chamber are the key to determine the jet propulsion performance of the aircraft. Traditional equipment mainly uses hydrocarbon fuels as the main raw materials, but under the guidance of low-carbon and clean targets, flexible combustion based on hydrogen has become an important trend of future fuels. Due to the extremely fast reaction speed and high flame temperature of hydrogen, it is difficult for traditional combustion chambers and nozzles to directly burn hydrogen, the risk of backfire increases, the risk of combustion instability increases greatly, and the mixing uniformity is also affected. New methods must be considered. form of combustion. The micro-mixed combustion technology achieves ultra-low emissions by reducing the mixing scale of fuel and air and enhancing the uniformity of the outlet. At the same time, the high-speed jet at the outlet has strong anti-tempering ability and flexible fuel adaptability.

Traditional combustors cannot achieve safe and efficient combustion of flexible fuels, mainly hydrogen. Although the currently developed micro-mixed combustion technology can realize flexible fuel combustion, due to the unreasonable design of the existing nozzle structure, it will appear in practical applications that the low-load stability is poor, the high-efficiency working load range is not wide enough, and the flame is prone to combustion. Oscillation, more NOx emissions.

Contents of the invention

The invention provides a micro-mixed nozzle structure and a combustion chamber with staggered speeds, which are used to solve the problem of poor flame combustion stability in the current nozzles based on the micro-mixed combustion technology.

The present invention provides a micro-mixing nozzle structure with staggered speed, comprising: a mounting seat and a first nozzle unit;

The first nozzle unit is arranged on the mounting seat; the first nozzle unit includes a plurality of premixed microtubes at the reference position and a plurality of premixed microtubes at the staggered position; the premixed microtubes at the reference position and the interleaved microtubes Both premixing microtubes are used to premix the incoming fuel and oxidant, and discharge the premixed gas from their respective outlet ports;

The plurality of premixed microtubes at the reference position and the premixed microtubes at the staggered position are arranged side by side, and the premixed microtubes at the staggered position are arranged between the premixed microtubes at the reference position;

The outlet end of the staggered position premixed microtube is flush with the outlet end of the reference position premixed microtube; the outlet end of the staggered position premixed microtube is aligned with the outlet end of the reference position premixed microtube The jet velocity of the mixed gas is different, so as to realize the staggering of the flame delay time of the premixed microtube at the staggered position and the premixed microtube at the reference position.

According to a micro-mixing nozzle structure with staggered velocity provided by the present invention, both the premixed microtube at the reference position and the premixed microtube at the staggered position include a premixed microtube body, a fuel inlet and an oxidant inlet;

A gas passage is formed between the inlet end and the outlet end of the premixed microtube body; the fuel inlet and the oxidant inlet are respectively communicated with the gas passage; the fuel inlet is arranged at the inlet end, and the The oxidant inlet is located on the side wall of the premixed microtube body;

Wherein, the jet velocity is determined by the pressure drop before and after the air intake in the premixed microtube body, the total effective area of the oxidant inlet and outlet ports of the premixed microtube body, and the effective area of the outlet port.

According to a micro-mixing nozzle structure with staggered velocity provided by the present invention, the jet velocity satisfies the following formula:

；

;

表示预混微管本体内进气前后的压降值，A表示预混微管本体的氧化剂入口和出口端的总有效面积，A ₂表示预混微管本体的出口端的有效面积。In the above formula, u ₂ represents the jet velocity,

Represent the pressure drop value before and after air intake in the premixed microtube body, A represents the total effective area of the oxidant inlet and outlet ports of the premixed microtube body, _and A2 represents the effective area of the outlet port of the premixed microtube body.

According to a micro-mixing nozzle structure with staggered speeds provided by the present invention, on the projection plane perpendicular to the axial direction of the reference-position pre-mixing micro-tubes, the projections of a plurality of said reference-position pre-mixing micro-tubes and the plurality of said pre-mixing micro-tubes The projections of the staggered premixed microtubes are arranged in an array to form a projection array.

According to a micro-mixing nozzle structure with staggered speeds provided by the present invention, in each row corresponding to the projection array, the projections of the premixed microtubes at the reference position and the projections of the premixed microtubes at the staggered position alternate set up.

According to a micro-mixing nozzle structure with staggered speed provided by the present invention, the projection array includes a first-type projection row formed based on the projection of the reference-position premixed microtube and a projection based on the staggered-position premixed microtube The second type of projection line formed;

The projection lines of the first type and the projection lines of the second type are arranged alternately row by row;

Alternatively, the first type of projection rows and the second type of projection rows are provided with multiple rows, the multiple rows of the first type of projection rows form the first projection array, and the multiple rows of the second type of projection rows form the second projection array. As for the projection array, the first projection array and the second projection array are arranged alternately.

According to a micro-mixing nozzle structure with staggered velocity provided by the present invention, the projection array includes a first rectangular projection array formed based on the projection of the premixed microtube at the reference position and a projection based on the premixed microtube at the staggered position The formed second rectangular projection array; the first rectangular projection array and the second rectangular projection array are arranged in an array.

According to a micro-mixing nozzle structure with staggered speeds provided by the present invention, in the projection array, the projections of a plurality of the staggered-position premixing microtubes are distributed discretely, and are distributed in a plurality of the reference-position premixing microtubes. Between projections of microtubules.

According to a staggered speed micro-mixing nozzle structure provided by the present invention, the speed staggered micro-mixing nozzle structure further includes a second nozzle unit and a third nozzle unit;

The second nozzle unit includes a plurality of premixed micropipes arranged side by side, and the third nozzle unit includes a plurality of premixed micropipes arranged side by side; the second nozzle unit and the The third nozzle unit is respectively arranged on the mounting seat and arranged side by side with the first nozzle unit;

Wherein, at least two of the first nozzle unit, the second nozzle unit and the third nozzle unit are arranged in sequence along the circumference;

Or, any one of the first nozzle unit, the second nozzle unit and the third nozzle unit is set at the center of the circle, and the first nozzle unit, the second nozzle unit and the third nozzle unit At least two types of nozzle units are arranged in a circle around the center of the circle.

The present invention also provides a combustion chamber, which includes the structure of micro-mixing nozzles with staggered velocities as described in any one of the above.

The present invention provides a micro-mixing nozzle structure and combustion chamber with staggered speeds. By arranging a plurality of staggered-position premixed microtubes side by side between a plurality of reference-positioned premixed microtubes, it can The design of the internal gas path structure of the premixed microtube and the reference position makes the jet velocity of the mixed gas different between the outlet end of the premixed microtube in the staggered position and the outlet port of the premixed microtube in the reference position. The flame delay time of microtubes and staggered premixed microtubes is adjusted to realize the staggered arrangement of reference premixed microtubes and staggered premixed microtubes with different flame delay times, so as to effectively suppress combustion oscillation and ensure flame combustion stability , can increase the service life and safety of the combustion chamber.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are the present invention. For some embodiments of the invention, those skilled in the art can also obtain other drawings based on these drawings without creative effort.

Fig. 1 is one of the structural representations of the micro-mixing nozzle structure with staggered velocity provided by the present invention;

Fig. 2 is one of the schematic diagrams of the three-dimensional structure of the reference position premixed microtube provided by the present invention;

Fig. 3 is a schematic cross-sectional structure diagram of Fig. 2 provided by the present invention;

Fig. 4 is the second schematic diagram of the three-dimensional structure of the reference position premixed microtube provided by the present invention;

Fig. 5 is one of the schematic diagrams of the arrangement of the reference position premixed microtube and the staggered position premixed microtube corresponding to the first nozzle unit provided by the present invention;

Fig. 6 is the second schematic diagram of the arrangement of the premixed microtubes at the reference position and the premixed microtubes at the staggered position corresponding to the first nozzle unit provided by the present invention;

Fig. 7 is the third schematic diagram of the arrangement of the premixed microtubes at the reference position and the premixed microtubes at the staggered position corresponding to the first nozzle unit provided by the present invention;

Fig. 8 is the fourth schematic diagram of the arrangement of the premixed microtubes at the reference position and the premixed microtubes at the staggered position corresponding to the first nozzle unit provided by the present invention;

Fig. 9 is the fifth schematic diagram of the arrangement of the premixed microtubes at the reference position and the premixed microtubes at the staggered position corresponding to the first nozzle unit provided by the present invention;

Fig. 10 is the second structural schematic diagram of the micro-mixing nozzle structure with staggered velocity provided by the present invention;

Fig. 11 is a schematic diagram of the three-dimensional structure corresponding to Fig. 10 provided by the present invention;

Fig. 12 is the third structural schematic diagram of the micro-mixing nozzle structure with staggered velocity provided by the present invention;

Fig. 13 is a schematic diagram of the three-dimensional structure corresponding to Fig. 12 provided by the present invention;

Fig. 14 is the fourth structural schematic diagram of the micro-mixing nozzle structure with staggered velocity provided by the present invention;

Fig. 15 is a schematic diagram of the three-dimensional structure corresponding to Fig. 14 provided by the present invention;

Reference signs:

1. Mounting seat; 11. Mounting hole;

2. The first nozzle unit; 21. The premixed microtube at the reference position; 22. The premixed microtube at the staggered position; 211. The premixed microtube body; 212. The fuel inlet; 213. The oxidant inlet; 2111. The annular protrusion;

3. The second nozzle unit; 4. The third nozzle unit.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The structure of the micro-mixing nozzle with staggered velocity and the combustion chamber provided by the embodiment of the present invention will be described in detail below through specific embodiments and application scenarios with reference to FIGS. 1 to 15 .

In the first aspect, as shown in FIG. 1 , the present invention provides a micro-mixing nozzle structure with staggered velocity, including: a mounting base 1 and a first nozzle unit 2 .

The first nozzle unit 2 is located on the mounting base 1; the first nozzle unit 2 includes a plurality of premixed microtubes 21 at the reference position and a plurality of premixed microtubes 22 at the staggered position, and the premixed microtubes 21 at the reference position and the premixed microtubes at the staggered position The pipes 22 are used for premixing the incoming fuel and oxidant, and the premixed gas is discharged from their respective outlet ports.

A plurality of standard premixed microtubes 21 and a plurality of staggered premixed microtubes 22 are arranged side by side, and a plurality of staggered premixed microtubes 22 are arranged between the plurality of standard premixed microtubes 21 .

Wherein, the ratio of the number of interleaved premixed microtubes 22 to the total number of reference premixed microtubes 21 and interleaved premixed microtubes 22 in the first nozzle unit 2 may be 0.1˜0.5.

Further, the outlet end of the premixed microtube 22 of the staggered position is flush with the outlet end of the premixed microtube 21 of the reference position; The jet velocity of the gas is different, so as to realize the staggering of the flame delay time of the premixed microtube 22 at the staggered position and the premixed microtube 21 at the reference position.

It can be understood that, after passing into the fuel and the oxidant in the premixed microtube 21 of the reference position, the fuel and the oxidant are fully mixed during the flow process in the premixed microtube 21 of the reference position, and then from the premixed microtube 21 of the reference position The outlet end is discharged at high speed and can be ignited and burned.

Correspondingly, after the fuel and the oxidant are passed into the staggered premixed microtube 22, the fuel and the oxidant are fully mixed during the flow process in the staggered premixed microtube 22, and then from the outlet end of the staggered premixed microtube 22 High-speed discharge, and can carry out ignition combustion.

In practical application, in this embodiment, along the axial direction of the reference position premixing microtube 21, the outlet end of the staggered position premixing microtube 22 and the reference position premixing microtube 21 can be set to have the same length, so that the staggered While the outlet end of the premixed microtube 22 is flush with the outlet end of the premixed microtube 21 , the inlet end of the premixed microtube 22 is flush with the inlet end of the premixed microtube 21 .

At the same time, in this embodiment, the air path structures corresponding to the premixed microtube 22 at the staggered position and the premixed microtube 21 at the reference position can be set differently, so as to realize that the outlet port of the premixed microtube 22 at the staggered position is different from the premixed microtube at the reference position. The outlet ports of the mixing microtube 21 have different jet velocities for the mixed gas. Because the flame length corresponding to the respective outlet ports of the premixed microtube 22 of the staggered position and the premixed microtube 21 of the reference position usually remains relatively constant, the flame of the premixed microtube 21 of the reference position and the premixed microtube 22 of the staggered position The delay time will show differences due to different jet speeds.

As can be seen from the above, in this embodiment, by arranging a plurality of staggered position premixed microtubes 22 side by side between a plurality of reference position premixed microtubes 21, it can be based on the interleaved position premixed microtubes 22 and the reference position premixed microtubes The design of the internal gas path structure of 21 makes the outlet end of the premixed microtube 22 of the staggered position and the jet velocity of the mixed gas different from the outlet end of the premixed microtube 21 of the reference position, so that the premixed microtube 21 and the reference position are different. The flame delay time of the staggered premixed microtubes 22 is adjusted to realize the staggered arrangement of the reference premixed microtubes 21 and the staggered premixed microtubes 22 with different flame delay times, thereby effectively suppressing combustion oscillations and ensuring flame combustion stability , can increase the service life and safety of the combustion chamber.

In some embodiments, as shown in FIGS. .

A gas channel is formed between the inlet end and the outlet end of the premixed microtube body 211 , and the fuel inlet 212 and the oxidant inlet 213 communicate with the gas channel respectively.

The fuel inlet 212 is arranged at the inlet end of the premixed microtube body 211 , the inlet end of the premixed microtube body 211 can also be formed as the fuel inlet 212 , and the oxidant inlet 213 is arranged at the side wall of the premixed microtube body 211 .

Wherein, the shape of the oxidant inlet 213 may be circular, oval, triangular, rectangular, "D" and other shapes, which are not specifically limited.

In FIGS. 2 and 3 , the oxidant inlet 213 on the side wall of the premixed microtube body 211 is circular. In FIG. 4 , the oxidant inlet 213 on the sidewall of the premixed microtube body 211 is square.

The fuel inlet 212 is used to feed fuel, which can be combustible gases such as hydrogen and carbon monoxide, and the oxidant inlet 213 is used to feed gaseous oxidant, which can be air or high-purity oxygen.

As shown in Figures 2 and 3, in order to improve the premixing effect of fuel and oxidant, multiple oxidant inlets 213 can be provided, and multiple oxidant inlets 213 can be divided into multiple rows along the axial direction of the premixed microtube body 211, each A plurality of oxidant inlets 213 corresponding to a row are arranged in a circle relative to the central axis of the premixed microtube body 211 .

Optionally, in order to improve the premixing effect of fuel and oxidant, multiple oxidant inlets 213 may be provided in this embodiment, and multiple oxidant inlets 213 are arranged in a helical trajectory relative to the central axis of the premixed microtube body 211 .

Optionally, in order to improve the premixing effect of the fuel and the oxidant, the above-mentioned gas channel can be configured to include a straight pipe section and a constricted section, the first end of the straight pipe section is formed as a fuel inlet 212, and an oxidant inlet 213 can be provided on the side wall of the straight pipe section , the second end of the straight pipe section communicates with the first end of the constricted section, and the second end of the constricted section is used as the outlet port of the premixed microtube body 211 to realize the output of mixed fuel and oxidant.

As shown in Figures 1 to 4, in this embodiment, an annular protrusion 2111 can be provided on the peripheral wall of the straight pipe section. The connection between 2111 and the mounting base 1 realizes the installation of the premixed microtube body 211 on the mounting base 1.

Further, the jet velocity corresponding to the outlet end of the reference position premixed microtube 21 and the staggered position premixed microtube 22 shown in the above embodiment is determined by the pressure drop value before and after the air intake in the premixed microtube body 211, the premixed The total effective area of the oxidant inlet and outlet ports of the mixing microtube body 211 and the effective area of the outlet port of the premixing microtube body 211 are determined.

It can be understood that in this embodiment, the internal air path structure of the premixed microtube body 211 can be adjusted according to actual needs to adjust the above-mentioned pressure drop; or, by adjusting the diameter and quantity of the oxidant inlet, and adjusting the premixed The caliber of the outlet end of the microtube body 211 makes the jet velocity of the mixed gas at the outlet end of the staggered premixed microtube 22 different from the jet velocity of the mixed gas at the outlet end of the premixed microtube 21 at the reference position.

In some embodiments, the jet velocity shown in the above embodiments satisfies the following formula:

；

;

表示预混微管本体211内进气前后的压降值，A表示预混微管本体211的氧化剂入口和出口端的总有效面积，A ₂表示预混微管本体211的出口端的有效面积。In the above formula, u ₂ represents the jet velocity,

Represent the pressure drop value before and after air intake in the premixed microtube body 211, A represents the total effective area of the oxidant inlet and the outlet _port of the premixed microtube body 211, A represents the effective area of the outlet port of the premixed microtube body 211.

In practical applications, the calibers of the oxidant inlets on the premixed microtube body 211 may be the same or different. For this reason, set Di to represent the caliber of the oxidant inlet, _and D2 to represent the _diameter of the outlet end of the premixed microtube body 211.

At the same time, as shown in Figures 2 and 3, in this embodiment, the arrangement of the oxidant inlets can be set to be n×m, that is, the oxidant inlets are arranged in n columns along the axial direction of the premixed microtube body 211, There are m oxidant inlets distributed along the circumferential direction of the premixed microtube body 211 in each row. Wherein, the number of n is 1-4, and the number of m is 2-4. Thus, the total number of oxidant inlets is n×m.

Further, the effective area A ₁ of the oxidant inlet on the premixed microtube body 211 can be calculated with reference to the following formula.

表示流量系数，其取值可以为0.5～0.8；A₁₀表示氧化剂入口的几何面积。In the above formula,

Indicates the flow coefficient, which can range from 0.5 to 0.8; A ₁₀ indicates the geometric area of the oxidant inlet.

Further, the effective area A ₂ of the outlet port on the premixed microtube body 211 can be calculated with reference to the following formula.

表示流量系数，其取值可以为0.8～1.0；A₂₀表示预混微管本体211上的出口端的几何面积。In the above formula,

Indicates the flow coefficient, and its value can be _0.8-1.0 ;

保持不变，则基准位预混微管21和交错位预混微管22各自所对应的氧化剂入口和出口端的总有效面积A保持不变。In order to ensure the pressure drop value before and after the air intake in the premixed microtube 21 of the reference position and the premixed microtube 22 of the staggered position

If kept constant, the total effective area A of the inlet and outlet ports of the oxidant corresponding to the premixing microtube 21 at the reference position and the premixing microtube 22 at the alternate position respectively remains unchanged.

，可以得到不同预混微管内进气前后的总压降值保持不变，也即总压降值为常数C，总压降值可以参照下述方程：According to the Bernoulli equation:

, it can be obtained that the total pressure drop value before and after the air intake in different premixed microtubes remains unchanged , that is, the total pressure drop value is a constant C, and the total pressure drop value can refer to the following equation:

表示预混微管本体211在氧化剂入口侧的压降值，/>

表示预混微管本体211在出口端的压降值，ρ表示流体密度，u ₁表示氧化剂入口侧的气体流速，u ₂表示预混微管本体211的出口端的射流速度。In the above formula,

Indicates the pressure drop value of the premixed microtube body 211 on the oxidant inlet side, />

Represents the pressure drop value of the premixed microtube body ₂₁₁ at the outlet end, ρ represents the fluid density, u1 represents the gas flow rate at the inlet side of the oxidant, _{and u2} represents the jet velocity at the outlet end of the premixed microtube body 211.

；其中，/>

为体积流量。From the continuity equation:

; where />

is the volume flow.

Combining the above formulas, the following equation characterizing the jet velocity u ₂ can be obtained.

It should be pointed out here that generally the actual jet propulsion power combustion system works under turbulent flow conditions, and the combustion flow enters the self-modeling area, and the flame length L _f generally remains relatively unchanged at this time.

，从而达到抑制燃烧振荡的效果。Thus, in the present invention, by adjusting the jet velocity u ₂ at the outlet end of the premixed microtube body 211, the flame delay time can be adjusted

, so as to achieve the effect of suppressing combustion oscillation.

According to the above relational formula, pre-mixing micropipes with different jet velocities can be designed, so as to obtain the micro-mixing nozzle structure with staggered delay times shown in this application.

As shown in Figures 5 to 9, this embodiment can set the projection of the reference position premixed microtube 21 and the arrangement form of the staggered position premixed microtube 22 according to actual needs, so as to ensure that the expected result is achieved based on the structure of the micromixing nozzle. Flame burning effect.

Wherein, the flame delay time of the premixed microtube 22 at the staggered position is different from the flame delay time of the premixed microtube 21 at the reference position. Of course, in this embodiment, it is also possible to set the air path structure corresponding to each staggered position premixing microtube 22 to be different, so that the jet velocity at the outlet end of each staggered position premixing microtube 22 is different, so as to realize each staggered position premixing The flame delay times of the microtubes 22 are also different.

In some examples, on the projection plane perpendicular to the axial direction of the reference premixed microtubes 21, the projections of the multiple reference premixed microtubes 21 and the projections of the multiple staggered premixed microtubes 22 are arranged in an array , to form a projection array.

Taking the 4×4 projection array formed by the projections of the premixed microtubes 21 at the reference position and the premixed microtubes 22 at the staggered position as an example, the arrangement form of the premixed microtubes 21 at the reference position and the premixed microtubes 22 at the staggered position is taken as an example. Be specific.

As shown in FIG. 5 , in each row corresponding to the projection array shown in the above-mentioned embodiment, the projections of the premixing microtubes 21 at the reference level and the premixing microtubes 22 at the staggered level are arranged alternately.

In this way, in the physical arrangement structure corresponding to each row in the projection array, the arrangement form of the premixed microtube 21 at the reference position and the premixed microtube 22 at the staggered position is the premixed microtube 21 at the reference position-the premixed microtube at the staggered position 22-base premixed microtube 21-staggered premixed microtube 22.

As shown in Figure 6, the projection array shown in the above embodiment includes the first type of projection row formed based on the projection of the reference premixed microtube 21 and the second type of projection row formed based on the projection of the interleaved premixed microtube 22 . The projection lines of the first type and the projection lines of the second type are arranged alternately line by line.

In this way, in the physical arrangement structure corresponding to the projection array, the first row is formed by arranging a plurality of standard premixed microtubes 21 side by side, and the second row is formed by a plurality of staggered premixed microtubes 22 arranged side by side. The third row is formed by arranging a plurality of standard premixed microtubes 21 side by side, and the fourth row is formed by a plurality of staggered premixed microtubes 22 arranged side by side.

As shown in Figure 7, the first type of projection lines and the second type of projection lines shown in the above-mentioned embodiments are provided with multiple lines, and the multiple lines of the first type of projection lines form the first projection array, and the multiple lines of the second type of projection lines form the first projection array. The second projection array, the first projection array and the second projection array are arranged alternately.

In this way, in the physical arrangement structure corresponding to the projection array, the first row and the second row are arranged side by side by a plurality of reference position premixed microtubes 21, and the third row and the fourth row are formed by a plurality of staggered position The premix microtubes 22 are arranged side by side.

As shown in FIG. 8 , the projection array shown in the above embodiment includes a first rectangular projection array formed based on the projection of the reference premixed microtube 21 and a second rectangular projection array formed based on the projection of the interleaved premixed microtube 22 ; The first rectangular projection array and the second rectangular projection array are arranged in an array.

In this way, in the physical arrangement structure corresponding to the projection array, the four reference position premixed microtubes 21 form the first physical array corresponding to the first rectangular projection array, and the four interleaved position premixed microtubes 22 form the second For the second solid array corresponding to the rectangular projection array, the first solid array and the second solid array are arranged again, and in each row after the formation, the first solid array and the second solid array are arranged alternately.

As shown in FIG. 9 , in the projection array shown in the above embodiment, the projections of the multiple staggered-position premixing microtubes 22 are discretely distributed, and are distributed between the projections of the multiple reference-position premixing microtubes 21 .

In this way, in the physical arrangement structure corresponding to the projection array, a plurality of staggered premixed microtubes 22 are randomly distributed among the plurality of reference premixed microtubes 21 .

It should be pointed out here that the reference-position premixing microtubes 21 and staggered-position premixing microtubes 22 corresponding to the first nozzle unit 2 shown in this embodiment can not only be arranged in an array in a rectangular area, but also in a fan-shaped The regions are arranged in concentric circles relative to the center of the fan-shaped region, and may also be arranged in concentric circles in the circular region relative to the center of the circular region.

In some embodiments, as shown in FIGS. 10 to 15 , the micro-mixing nozzle structure further includes a second nozzle unit 3 and a third nozzle unit 4 .

The second nozzle unit 3 includes a plurality of reference level premixing microtubes 21 arranged side by side, the inlet ends of the plurality of reference level premixing microtubes 21 are flush, and the outlet ends of the plurality of reference level premixing microtubes 21 are flush. Wherein, the jet velocity at the outlet end of the premixing microtube 21 at each reference position is the same.

The third nozzle unit 4 includes a plurality of staggered premixing microtubes 22 arranged side by side, the inlet ends of the plurality of staggered premixing microtubes 22 are flush, and the outlet ends of the plurality of staggered premixing microtubes 22 are flush. Wherein, the jet velocity at the outlet end of each cross-position premixing microtube 22 may be the same or different, which is not specifically limited.

At the same time, the second nozzle unit 3 and the third nozzle unit 4 are respectively arranged on the mounting seat 1 , and the second nozzle unit 3 and the third nozzle unit 4 are respectively arranged side by side with the first nozzle unit 2 .

It can be understood that the direction of the gas outlet of the second nozzle unit 3 and the gas outlet of the third nozzle unit 4 is the same as that of the gas outlet of the first nozzle unit 2 .

Wherein, the layout method of the reference position premixed microtube 21 corresponding to the second nozzle unit 3 on the mounting seat 1 is the same as that of the reference position premixed microtube 21 corresponding to the first nozzle unit 2 on the mounting seat 1 .

Correspondingly, the layout of the staggered premixed microtubes 22 corresponding to the third nozzle unit 4 on the mounting base 1 is the same as the layout of the staggered premixed microtubes 22 corresponding to the first nozzle unit 2 on the mounting base 1 same.

Wherein, for each staggered position premixed microtube 22 corresponding to the third nozzle unit 4, the internal gas path structure corresponding to each staggered position premixed microtube 22 can be the same or different, and this is not specifically limited. .

In some embodiments, in the case where the combustion chamber adapted to the micro-mixing nozzle structure is an annular combustion chamber, at least two of the first nozzle unit 2, the second nozzle unit 3 and the third nozzle unit 4 can be used in this embodiment The species are arranged circumferentially around the center of the annular combustion chamber.

As shown in Figure 10 and Figure 11, for the annular combustion chamber, the mounting seat 1 is in the form of a ring, and the corresponding arrangement area of the first nozzle unit 2, the second nozzle unit 3 and the third nozzle unit 4 on the mounting seat 1 All fan-shaped.

Wherein, the first nozzle unit 2, the second nozzle unit 3, the third nozzle unit 4, the second nozzle unit 3, the third nozzle unit 4, the second nozzle unit 3, the third nozzle unit 4 and the second nozzle unit 3 surround The centers of the mounting bases 1 are arranged alternately in sequence.

As shown in Figure 12 and Figure 13, for the annular combustion chamber, the mounting seat 1 is in the shape of a ring, and the corresponding arrangement area of the first nozzle unit 2, the second nozzle unit 3 and the third nozzle unit 4 on the mounting seat 1 All are round.

Wherein, the second nozzle unit 3, the third nozzle unit 4, the second nozzle unit 3, the first nozzle unit 2, the second nozzle unit 3, the third nozzle unit 4, the second nozzle unit 3 and the third nozzle unit 4 surround The centers of the mounting bases 1 are arranged alternately in sequence.

In some embodiments, in the case where the combustion chamber adapted to the micro-mixing nozzle structure is a single cylinder type combustion chamber, this embodiment can use the first nozzle unit 2, the second nozzle unit 3 and the third nozzle unit 4 Any of them is arranged at the center of the circle, and at least two of the first nozzle unit 2 , the second nozzle unit 3 and the third nozzle unit 4 are arranged in a circle around the center of the circle.

As shown in Figure 14 and Figure 15, the mounting base 1 is disc-shaped, the third nozzle unit 4 is arranged at the center of the mounting base 1, and the mounting base 1 is provided with a first nozzle unit 2 and a second nozzle unit around the center of the circle. 3 and the third nozzle unit 4, the first nozzle unit 2, the third nozzle unit 4, the third nozzle unit 4, the second nozzle unit 3 and the third nozzle unit 4 surround the third nozzle unit 4 at the center of the circle in turn along the circumference Arranged alternately.

It can be seen from the above that the micro-mixed nozzle structure of the embodiment of the present invention can not only realize the efficient combustion of flexible fuels mainly hydrogen fuel through the micro-mixed combustion technology, realize low-carbon or even zero-carbon emissions, but also can design multiple reference positions to predict The jet velocity of the mixed microtube 21 and multiple staggered premixed microtubes 22 realizes the adjustment of the flame delay time of the reference premixed microtube 21 and the staggered premixed microtube 22, and realizes the reference position of different flame delay times The staggered arrangement of the premixed microtubes 21 and the staggered premixed microtubes 22 can effectively suppress combustion oscillations, ensure flame combustion stability, and increase the service life and safety of the combustion chamber.

In a second aspect, the present invention also provides a combustion chamber, which includes the above-mentioned micro-mixing nozzle structure with staggered velocity.

Specifically, since the combustion chamber includes a micro-mixing nozzle structure, and the specific structure of the micro-mixing nozzle structure refers to the above-mentioned embodiment, the combustion chamber of this embodiment includes all the technical solutions of the above-mentioned embodiment, therefore, at least has all the above-mentioned embodiments. All beneficial effects achieved by the technical solution will not be repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (9)

1. A speed staggered micro-mixing nozzle structure, comprising: the mounting seat and the first nozzle unit;

the first nozzle unit is arranged on the mounting seat; the first nozzle unit comprises a plurality of reference position premixing micro-pipes and a plurality of staggered position premixing micro-pipes; the reference-position premixing microtubes and the staggered-position premixing microtubes are used for premixing the introduced fuel and oxidant, and discharging premixed mixed gas from respective outlet ends;

the reference position premixing microtubes and the staggered position premixing microtubes are arranged side by side, and the staggered position premixing microtubes are arranged among the reference position premixing microtubes;

the outlet end of the staggered position premixing microtube is flush with the outlet end of the reference position premixing microtube; the gas path structures corresponding to the staggered position premixing microtubes and the reference position premixing microtubes are different, so that the jet flow speeds of the mixed gas by the outlet ends of the staggered position premixing microtubes and the reference position premixing microtubes are different, and the staggered position premixing microtubes and the reference position premixing microtubes are staggered in flame delay time;

the datum-position premixing microtube and the staggered-position premixing microtube comprise a premixing microtube body, a fuel inlet and an oxidant inlet;

a gas channel is formed between the inlet end and the outlet end of the premixing microtube body; the fuel inlet and the oxidant inlet are respectively communicated with the gas channel; the fuel inlet is arranged at the inlet end, and the oxidant inlet is arranged on the side wall of the premixing microtube body;

the jet flow speed is determined by the pressure drop value before and after air inflow in the premixing microtube body, the total effective area of the oxidant inlet and outlet ends of the premixing microtube body and the effective area of the outlet end.

2. The speed staggered micro-mixing nozzle structure of claim 1, wherein the jet speed satisfies the following formula:

；

in the above-mentioned description of the invention,u ₂ representation ofThe velocity of the jet stream is such that,

representing the pressure drop values before and after air intake in the premix microtube body, ρ representing the fluid density,Arepresenting the total effective area of the oxidant inlet and outlet ends of the premix microtube body,A ₂ representing the effective area of the outlet end of the premix microtube body.

3. The speed staggered micro-mixing nozzle structure according to claim 1 or 2, wherein projections of a plurality of the reference position premix microtubes and projections of a plurality of the staggered position premix microtubes are arranged in an array on a projection plane perpendicular to an axial direction of the reference position premix microtubes to form a projection array.

4. A speed staggered micro-mixing nozzle structure as claimed in claim 3, wherein the projections of the reference bit premix microtubes and the projections of the staggered bit premix microtubes are alternately arranged in each row corresponding to the projection array.

5. A speed staggered micro-mixing nozzle structure as claimed in claim 3, wherein the projection array comprises a first type of projection rows formed based on projections of the reference bit premix microtubes and a second type of projection rows formed based on projections of the staggered bit premix microtubes;

the first type projection lines and the second type projection lines are alternately arranged line by line;

or the first type projection rows and the second type projection rows are provided with a plurality of rows, the plurality of rows of the first type projection rows form a first projection array, the plurality of rows of the second type projection rows form a second projection array, and the first projection array and the second projection array are alternately arranged.

6. A speed staggered micro-mixing nozzle structure as claimed in claim 3, wherein the projection array comprises a first rectangular projection array formed based on projections of the reference bit premix microtubes and a second rectangular projection array formed based on projections of the staggered bit premix microtubes; the first rectangular projection array and the second rectangular projection array are arranged in an array.

7. A speed staggered micro-mixing nozzle structure as claimed in claim 3, wherein the projections of the plurality of staggered bit premix microtubes are distributed in a discrete manner in the projection array and are distributed among the projections of the plurality of reference bit premix microtubes.

8. The speed staggered micro-mixing nozzle structure according to claim 1 or 2, wherein the speed staggered micro-mixing nozzle structure further comprises a second nozzle unit and a third nozzle unit;

the second nozzle unit comprises a plurality of datum position premixing micro-pipes which are arranged side by side, and the third nozzle unit comprises a plurality of staggered position premixing micro-pipes which are arranged side by side; the second nozzle unit and the third nozzle unit are respectively arranged on the mounting seat and are arranged side by side with the first nozzle unit;

wherein at least two of the first nozzle unit, the second nozzle unit and the third nozzle unit are sequentially arranged along the circumference;

or, any one of the first nozzle unit, the second nozzle unit and the third nozzle unit is arranged at the circle center position, and at least two of the first nozzle unit, the second nozzle unit and the third nozzle unit are sequentially and circumferentially arranged around the circle center position.

9. A combustion chamber comprising a speed staggered micro-mixing nozzle arrangement according to any one of claims 1 to 8.

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