Hydrogen fuel combustor with high-dilution primary stage

Abstract

This invention relates to the field of aerospace engine technology, providing a hydrogen fuel combustion chamber with a high-mixing-degree main combustion stage, including a flame tube with a front end and a rear end; a gas distribution assembly, configured in a disc shape and connected to the front end of the flame tube, the gas distribution assembly radially from the inside out including a pre-combustion stage gas supply region, a first main combustion stage gas supply region, and a second main combustion stage gas supply region; the pre-combustion stage / first main combustion stage / second main combustion stage gas supply regions are annular, these gas supply regions include several swirl vanes or spokes, each swirl vane or spoke having a hydrogen injection hole, every two adjacent swirl vanes or spokes being continuous along the length of the flame tube to form an air intake channel. With the above configuration, the mixing uniformity of hydrogen and air is improved compared to traditional single-row hydrogen injection holes, the combustion efficiency reaches over 99.9%, and at the same time, local rich or lean combustion regions are eliminated, NO... x Emissions reduced by 40%.

Description

Technical Field

[0001] This invention relates to the field of aerospace engine technology, and in particular to a hydrogen fuel combustion chamber with a high degree of mixing in the main combustion stage. Background Technology

[0002] In the design of hydrogen fuel cell combustors, the main combustion stage, as the core area of ​​the combustor, directly affects the flow area, combustion efficiency, flame stability, and pollutant emissions through its hydrogen nozzles and other structural features. Currently, most hydrogen fuel cell combustor designs employ a main combustion stage with a swirl structure and a single row of hydrogen nozzles. Although such a main combustion stage has made some progress in maintaining uniform mixing and stable combustion, it still faces some challenges in hydrogen fuel combustion.

[0003] Due to size limitations in structures such as the flame tube, the flow area of ​​the swirl structure in the main combustion stage is small, which affects the airflow and velocity entering the combustion chamber head. The restricted airflow makes it difficult to form effective turbulence. The single-row hydrogen nozzle further reduces the flow area, resulting in a smaller area for hydrogen to diffuse after injection, preventing timely mixing with air. This design reduces the uniformity of hydrogen-air mixing, leading to unstable combustion and consequently affecting subsequent combustion efficiency.

[0004] Conversely, if the swirling structure of the main combustion stage enhances fuel-air mixing, it significantly increases flow resistance, far exceeding the pressure loss compensated by a single row of hydrogen nozzles, thus reducing the overall system efficiency. Excessive swirling can also induce pressure oscillations, leading to periodic flame displacement and NO2. x Fluctuations. In addition, the complex flow channels of the swirling structure increase the difficulty of manufacturing and processing costs.

[0005] Furthermore, single-row hydrogen nozzles exhibit significant mixing uniformity defects under high-load conditions. At high injection rates, single-row nozzles struggle to achieve complete mixing within the limited combustion chamber length, resulting in locally rich or lean combustion zones. This further exacerbates temperature field inhomogeneity, leading to thermal stress concentration on the flame tube wall and shortening component lifespan. Compared to multi-row nozzles, single-row designs lack spatial mixing compensation mechanisms. When flow fluctuations occur in one nozzle, adjustments cannot be made through adjacent rows. At the same power output, the mixing uniformity of single-row nozzles is approximately 15%–25% lower than that of double-row nozzles, a difference particularly pronounced with highly reactive fuels like hydrogen. Summary of the Invention

[0006] This invention provides a hydrogen fuel combustion chamber with a high degree of mixing in the main combustion stage, which solves the defects of the existing technology where a single row of hydrogen nozzles cannot simultaneously ensure sufficient / uniform mixing of fuel and air and reduce the flow resistance in the swirling structure. It achieves a high degree of uniformity in the mixing of hydrogen and air while avoiding the occurrence of local high temperature areas in the hydrogen fuel combustion chamber, which would lead to ablation.

[0007] This invention provides a hydrogen fuel combustion chamber with a high-mixing-degree main combustion stage, comprising: A flame tube, having a front end and a rear end; The gas distribution assembly is constructed in a disc shape and connected to the front end of the flame tube. The gas distribution assembly includes, from the inside to the outside, a pre-combustion stage gas supply area, a first main combustion stage gas supply area, and a second main combustion stage gas supply area along its radial direction. The pre-combustion stage gas supply area is annular and includes several swirl blades. Each swirl blade has a pre-combustion stage hydrogen injection hole on its blade surface facing the flame tube. Every two adjacent swirl blades are connected along the length of the flame tube to form a pre-combustion stage air intake channel. The first main combustion stage air supply area is annular and includes several first main combustion stage spokes. Each first main combustion stage spoke is provided with several first main combustion stage hydrogen injection holes. Every two adjacent first main combustion stage spokes are connected along the length direction to form a first main combustion stage air intake channel. The second main combustion stage air supply area is annular and includes several second main combustion stage spokes. Each second main combustion stage spoke is provided with several second main combustion stage hydrogen injection holes. Every two adjacent second main combustion stage spokes are connected along the length direction to form a second main combustion stage air intake channel.

[0008] According to the present invention, a hydrogen fuel combustion chamber with a high blending degree main combustion stage is provided, wherein the first main combustion stage spokes and the second main combustion stage spokes extend parallel to the length direction and radially.

[0009] According to the hydrogen fuel combustion chamber with a high degree of mixing of the main combustion stage provided by the present invention, the pre-combustion stage gas supply area is a cyclone separator, and each cyclone blade can rotate around the virtual central axis of the gas distribution assembly.

[0010] According to the hydrogen fuel combustion chamber with a high blending degree main combustion stage provided by the present invention, each swirl blade is a straight blade, and the swirl number in the pre-combustion stage gas supply area is 0.8±5%.

[0011] According to the hydrogen fuel combustion chamber with a high degree of mixing of the main combustion stage provided by the present invention, the pre-combustion stage gas supply area further includes a hub, and in the length direction, the chamber portion of the flame tube corresponding to the hub forms a central recirculation zone.

[0012] The hydrogen fuel combustion chamber with a high mixing degree main combustion stage provided by the present invention further includes a pre-combustion stage hydrogen supply pipe, which is connected to the hub. The radial inner ends of each swirl blade are also connected to the hub, so that the pre-combustion stage hydrogen supply pipe is in fluid communication with each pre-combustion stage hydrogen injection hole.

[0013] The hydrogen fuel combustion chamber with a high blending degree main combustion stage provided by the present invention further includes a main combustion stage hydrogen supply pipe, which is connected between the first main combustion stage supply area and the second main combustion stage supply area so as to provide fluid communication between each first main combustion stage hydrogen injection hole and each second main combustion stage hydrogen injection hole.

[0014] The hydrogen fuel combustion chamber with a high blending degree main combustion stage provided by the present invention further includes a drain pipe, a pre-combustion stage hydrogen supply pipe and / or a main combustion stage hydrogen supply pipe extending inside the drain pipe, the first end of the drain pipe being fluidly connected to the flame tube, and the second end being fluidly connected to an external hydrogen recovery device.

[0015] According to the hydrogen fuel combustion chamber with a high blending degree main combustion stage provided by the present invention, the length of the flame tube is 2.3 ± 0.05 times its own maximum diameter.

[0016] The hydrogen fuel combustion chamber with a high blending degree main combustion stage provided by the present invention further includes an igniter, which is disposed at any position in the pre-combustion stage gas supply area facing the flame tube.

[0017] The hydrogen fuel combustion chamber with a high mixing ratio main combustion stage provided by this invention achieves a larger effective area within the limitation of the maximum diameter of the flame tube head (i.e., the gas distribution assembly) through the coordinated design of multiple rows of hydrogen injection holes and a large-area air intake channel in the main combustion stage. This significantly improves the mixing uniformity of hydrogen and air compared to traditional single-row hydrogen injection holes, resulting in a combustion efficiency of over 99.9% under high-load conditions. Furthermore, localized rich or lean combustion zones are eliminated, reducing NO... x Emissions are reduced by 40%. Furthermore, the low-flow-rate design of the main combustion stage air intake passage reduces the scouring and wear of the air on the nozzles of the valve train, thus reducing the frequency of replacement and maintenance costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an axial cross-sectional view of the hydrogen fuel combustion chamber with a high blending degree main combustion stage provided by the present invention.

[0020] Figure 2 yes Figure 1 The image shown is a half-section perspective view of a hydrogen fuel combustion chamber with a high-mixing main combustion stage.

[0021] Figure 3This is an axial sectional view of the valve distribution assembly provided by the present invention.

[0022] Figure 4 yes Figure 3 The diagram shows a half-section perspective view of the valve train assembly.

[0023] Figure 5 This is a front view of the gas distribution assembly provided by the present invention.

[0024] Figure 6 yes Figure 5 The radial cross-sectional view of the gas distribution assembly shown.

[0025] Figure label: 1. Flame tube; 101. Front end; 102. Rear end; 103. Central recirculation zone; 104. Pre-combustion stage; 105. Main combustion stage; 2. Valve train assembly; 201. Wheel hub; 202. Swirl vane; 203. Pre-combustion stage hydrogen injection port; 204. Pre-combustion stage air intake passage; 205. First main combustion stage spokes; 206. First main combustion stage hydrogen injection port; 207. First main combustion stage air intake passage; 208. Second main combustion stage spokes; 209. Second main combustion stage hydrogen injection port; 210. Second main combustion stage air intake passage; 3. Pre-combustion stage hydrogen supply pipe; 4. Main combustion stage hydrogen supply pipe; 5. Drain pipe. Detailed Implementation

[0026] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections, wherein a fixed connection can include an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0029] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The following is combined with Figures 1 to 6 The present invention describes a hydrogen fuel combustor with a high blending degree main combustion stage (hereinafter referred to as "hydrogen fuel combustor").

[0032] Figure 1 This is an axial sectional view of the hydrogen fuel combustion chamber with a high blending degree main combustion stage provided by the present invention. Figure 2 yes Figure 1 The diagram shown is a half-section perspective view of a hydrogen fuel combustion chamber with a high-mixing main combustion stage, as follows: Figures 1 to 2 As shown, the hydrogen fuel combustion chamber includes a flame tube 1 and a gas distribution assembly 2.

[0033] The flame tube 1 has a front end 101 and a rear end 102, and is configured to gradually taper from the front end 101 to the rear end 102. The rear end 102 of the flame tube 1 is open so that combustion products can be discharged through the flame tube 1.

[0034] The gas distribution assembly 2 is constructed in a disc shape and is sealed to the front end 101 of the flame tube 1, essentially forming the head of the flame tube 1. Due to the design dimensions of the hydrogen fuel combustion chamber, the flow area of ​​the gas distribution assembly 2 is correspondingly limited, ultimately affecting the airflow rate and velocity entering and passing through the gas distribution assembly 2. Even so, the gas distribution assembly 2 includes, from the inside to the outside, a pre-combustion stage gas supply area, a first main combustion stage gas supply area, and a second main combustion stage gas supply area along its radial direction.

[0035] Figure 4 This is a half-section perspective view of valve train 2. Figure 5 This is the front view of valve train 2, as shown below. Figures 4 to 5 As shown, the pre-combustion stage air supply region is constructed as an annular region. The pre-combustion stage air supply region includes several swirl blades 202. Although each swirl blade 202 extends from the inner ring to the outer ring of the annular region, its blade profile is not parallel to the length direction (i.e., axial direction) of the flame tube 1, but is inclined relative to both the axial direction and the radial plane (of the pre-combustion stage air supply region). Each swirl blade 202 has a pre-combustion stage hydrogen injection hole 203 on its blade surface facing the flame tube 1 to supply hydrogen as fuel into the inner cavity of the flame tube 1. Every two adjacent swirl blades 202 are continuous along the length direction of the flame tube 1 to form a pre-combustion stage air intake channel 204, through which ambient air enters the inner cavity of the flame tube 1.

[0036] Figure 6 This is a radial sectional view of the valve train assembly 2, as shown below. Figure 6 As shown, the first main combustion stage air supply region is also constructed as an annular region. The first main combustion stage air supply region includes several first main combustion stage spokes 205, each extending from the inner ring to the outer ring of the annular region, with its extension direction parallel to both the axial and radial directions. Each first main combustion stage spoke 205 is provided with several first main combustion stage hydrogen injection holes 206 to supply hydrogen as fuel to the inner cavity of the flame tube 1. Every two adjacent first main combustion stage spokes 205 are continuous along their length to form first main combustion stage air intake channels 207, allowing ambient air to pass through these channels and enter the inner cavity of the flame tube 1. Unlike the pre-combustion stage air intake channel 204, the first main combustion stage air intake channel 207 is a straight channel. Furthermore, the outlet of each first main combustion stage hydrogen injection hole 206 faces the corresponding first main combustion stage air intake channel 207.

[0037] Similarly, the second main combustion stage air supply region is also constructed as an annular region. The second main combustion stage air supply region includes several second main combustion stage spokes 208, each extending from the inner ring to the outer ring of the annular region, with its extension direction parallel to both the axial and radial directions. Each second main combustion stage spoke 208 is provided with several second main combustion stage hydrogen injection holes 209 to supply hydrogen as fuel to the inner cavity of the flame tube 1. Every two adjacent second main combustion stage spokes 208 are continuous along their length to form second main combustion stage air intake channels 210, allowing ambient air to pass through these channels and enter the inner cavity of the flame tube 1. Unlike the pre-combustion stage air intake channel 204, the second main combustion stage air intake channel 210 is a straight channel. Furthermore, the outlet of each second main combustion stage hydrogen injection hole 209 faces the corresponding second main combustion stage air intake channel 210.

[0038] Therefore, for the inner cavity of the flame tube 1, the inner cavity portion corresponding to the pre-combustion stage gas supply area of ​​the gas distribution assembly 2 in its length direction is the pre-combustion stage 104 of the hydrogen fuel combustion chamber; the inner cavity portion corresponding to the first main combustion stage gas supply area and the second main combustion stage gas supply area of ​​the gas distribution assembly 2 is the main combustion stage 105 of the hydrogen fuel combustion chamber.

[0039] The first main combustion stage air intake passage 207 and the second main combustion stage air intake passage 210 correspond to the inner / outer annular regions of the main combustion stage 105, respectively. Compared with the traditional single exhaust port design, the air intake passage of this hydrogen fuel combustion chamber is increased by 30% to 50%. Moreover, the virtual central axis of the first main combustion stage air intake passage 207 and the second main combustion stage air intake passage 210 is collinear with the virtual central axis of the flame tube 1, ensuring that air flows accurately into the core area of ​​the fuel mist cone.

[0040] This invention, through the coordinated design of multiple rows of hydrogen injection holes (first main combustion stage hydrogen injection holes 206 and second main combustion stage hydrogen injection holes 209) in the first and second main combustion stage air supply regions and large-area, linear air intake channels (first main combustion stage air intake channel 207 and second main combustion stage air intake channel 210), achieves a larger effective area within the limitation of the maximum diameter of the gas distribution assembly 2. Simultaneously, it significantly improves the uniformity of hydrogen-air mixing compared to traditional single-row hydrogen injection holes. Under high-load conditions, the combustion efficiency reaches over 99.9%, while eliminating localized rich or lean combustion areas and reducing NO. x Emissions are reduced by 40%. Furthermore, the low flow rate design of the first main combustion stage air intake passage 207 and the second main combustion stage air intake passage 210 reduces the scouring and wear of air on the first main combustion stage hydrogen injection port 206 and the second main combustion stage hydrogen injection port 209.

[0041] Figure 3 This is an axial sectional view of valve train 2, as shown below. Figure 3 As shown, in one embodiment, multiple rows of main combustion stage hydrogen injection holes are uniformly distributed along their respective annular regions. For example, two main combustion stage hydrogen injection holes are formed on each side surface of the first main combustion stage spokes 205 and the second main combustion stage spokes 208 facing the corresponding main combustion stage air intake channels (first main combustion stage air intake channel 207 and second main combustion stage air intake channel 210). In the radial direction of the gas distribution assembly 2, the center distance between two adjacent rows of main combustion stage hydrogen injection holes is 2.5 mm. In the first main combustion stage supply area, for example, seven first main combustion stage spokes 205 can be provided, thus providing a total of two rows with 14 first main combustion stage hydrogen injection holes 206 per row; in the second main combustion stage supply area, for example, ten second main combustion stage spokes 208 can be provided, thus providing a total of two rows with 20 second main combustion stage hydrogen injection holes 209 per row, to ensure that the injected hydrogen substantially covers the entire range of the main combustion stage.

[0042] Furthermore, the pre-combustion stage air supply area is constructed as a swirler, with each swirling blade 202 rotatable around the virtual central axis of the air distribution assembly 2. This indicates that both the hydrogen injected through the pre-combustion stage hydrogen injection hole 203 and the air flowing in through the pre-combustion stage air intake channel 204 form swirling currents and achieve preliminary atomization under the action of the swirling blades 202.

[0043] Furthermore, each swirl blade 202 is formed as a straight blade, and the swirl number in the pre-combustion stage air supply region is 0.8±5%. The swirl number is a dimensionless parameter characterizing the intensity of swirling flow; its physical meaning is the relative intensity of rotational motion and axial motion, which affects mixing, recirculation, and flow stability. Typical swirl numbers... The calculation formula is: in, Represents angular momentum. Indicates axial momentum. Indicates the radius.

[0044] Furthermore, the pre-combustion stage gas supply area also includes a hub 201, and in the longitudinal direction, the chamber portion of the flame tube 1 corresponding to the hub 201 forms a central recirculation zone 103. It should be noted that the hub 201 is designed to be closed, that is, no hydrogen or air flows through this area.

[0045] Through the above configuration, the swirl structure (i.e., the cyclone separator) corresponding to the pre-combustion stage 104 is freed from any potential bluff body structure, forming a stable central recirculation zone 103. This ensures stable combustion in the hydrogen fuel combustion chamber across a high load range, avoiding the risk of flameout caused by oscillations. Furthermore, this design eliminates localized high-temperature points, thereby reducing the outlet temperature of the gas distribution assembly 2 by 150°C to 200°C, preventing hydrogen fuel from impacting the bluff body and causing localized ablation. Simultaneously, this configuration also prevents the flame from being blown out, ensuring the stability of the combustion process and providing the hydrogen fuel combustion chamber with broader and more powerful adaptability.

[0046] Furthermore, the hydrogen fuel combustion chamber also includes a pre-combustion stage hydrogen supply pipe 3, which is connected to the wheel hub 201. (See reference...) Figure 1 , Figure 2 and Figure 4 Each swirl blade 202 has its radial inner end connected to the hub 201, which allows the pre-combustion stage hydrogen supply pipe 3 to be fluidly connected to each pre-combustion stage hydrogen injection hole 203.

[0047] Furthermore, the hydrogen fuel combustion chamber also includes a main combustion stage hydrogen supply pipe 4, which connects to the first main combustion stage supply area and the second main combustion stage supply area to provide fluid communication between the first main combustion stage hydrogen injection holes 206 and the second main combustion stage hydrogen injection holes 209. For example, an annular partition is formed between the first and second main combustion stage supply areas. This annular partition is hollow so that hydrogen from the main combustion stage hydrogen supply pipe 4 flows through the annular partition to the first main combustion stage spokes 205 and the second main combustion stage spokes 208, and finally reaches the first and second main combustion stage hydrogen injection holes 206 and 209.

[0048] Furthermore, the hydrogen fuel combustion chamber also includes a drain pipe 5, within which the pre-combustion stage hydrogen supply pipe 3 and / or the main combustion stage hydrogen supply pipe 4 extend. In other words, the length, extension direction, and circumference of the pre-combustion stage hydrogen supply pipe 3 and / or the main combustion stage hydrogen supply pipe 4 are all enclosed by the drain pipe 5. The first end of the drain pipe 5 is fluidly connected to the flame tube 1, and the second end is fluidly connected to an external hydrogen recovery device. In the event of a hydrogen leak in any section of the pre-combustion stage hydrogen supply pipe 3 and / or the main combustion stage hydrogen supply pipe 4, the leaked hydrogen remains within the enclosure of the drain pipe 5. Moreover, even if a leak occurs in the sealing connection between the gas distribution assembly 2 and the flame tube 1, the leaked hydrogen can still be collected by the drain pipe 5, thus avoiding safety hazards such as deflagration caused by excessive hydrogen concentration.

[0049] Furthermore, the flame tube 1 is designed with a length that is 2.3 ± 0.05 times its maximum diameter. The advantage of this design is that the length of the flame tube 1 can effectively enclose the combustion area and resist high-temperature erosion, avoiding the formation of localized high-temperature areas in the hydrogen fuel combustion chamber that could lead to ablation.

[0050] Furthermore, the hydrogen fuel combustion chamber also includes an igniter (not shown in the figure), which is located at any position in the pre-combustion stage gas supply area facing the flame tube 1. Thus, when hydrogen is injected from the pre-combustion stage hydrogen injection hole 203, air enters the inner cavity of the flame tube 1 through the pre-combustion stage air intake channel 204, and the pre-combustion stage gas supply area, which acts as a vortex generator, begins to rotate to mix hydrogen and air, the igniter ignites the hydrogen-air mixture, causing the pre-combustion stage 104 of the flame tube 1 (along its length direction) corresponding to the pre-combustion stage gas supply area to begin combustion, and a stable flame is formed under the synergistic effect of the central recirculation zone 103.

[0051] Simultaneously, hydrogen is ejected from the first main combustion stage hydrogen injection port 206 and the second main combustion stage hydrogen injection port 209, while air enters the inner cavity of the flame tube 1 through the first main combustion stage air intake channel 207 and the second main combustion stage air intake channel 210. The cooperation of the two hydrogen injection ports and the two air intake channels ensures that the hydrogen and air are fully and uniformly mixed. Under the ignition of the flame in the pre-combustion stage 104, the hydrogen-air mixture in the main combustion stage 105 is fully combusted, and the combustion products are discharged through the flame tube 1, especially its rear end 102, thereby realizing the entire combustion process.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen fuel combustion chamber with a high-mixing-degree main combustion stage, characterized in that, include: A flame tube, having a front end and a rear end; The gas distribution assembly is configured in a disc shape and connected to the front end of the flame tube. The gas distribution assembly includes, from the inside to the outside, a pre-combustion stage gas supply area, a first main combustion stage gas supply area, and a second main combustion stage gas supply area in its radial direction. The pre-combustion stage gas supply area is annular and includes several swirl blades. Each swirl blade has a pre-combustion stage hydrogen injection hole on its blade surface facing the flame tube. Every two adjacent swirl blades are connected along the length of the flame tube to form a pre-combustion stage air intake channel. The first main combustion stage air supply area is annular and includes several first main combustion stage spokes. Each first main combustion stage spoke is provided with several first main combustion stage hydrogen injection holes. Every two adjacent first main combustion stage spokes are connected along the length direction to form a first main combustion stage air intake channel. The second main combustion stage air supply area is annular and includes several second main combustion stage spokes. Each second main combustion stage spoke is provided with several second main combustion stage hydrogen injection holes. Every two adjacent second main combustion stage spokes are connected along the length direction to form a second main combustion stage air intake channel.

2. The hydrogen fuel combustion chamber with a high degree of mixing main combustion stage according to claim 1, characterized in that, The first main combustion stage spoke and the second main combustion stage spoke extend parallel to the length direction and radial direction.

3. The hydrogen fuel combustion chamber with a high degree of mixing main combustion stage according to claim 1, characterized in that, The pre-combustion stage air supply area is a cyclone separator, and each of the cyclone blades can rotate around the virtual central axis of the air distribution assembly.

4. The hydrogen fuel combustion chamber with a high degree of mixing main combustion stage according to claim 3, characterized in that, Each of the swirl blades is a straight blade, and the number of swirls in the pre-combustion stage air supply zone is 0.8±5%.

5. The hydrogen fuel combustion chamber with a high blending degree main combustion stage according to claim 3, characterized in that, The pre-combustion stage gas supply area also includes a hub, and in the length direction, the chamber portion of the flame tube corresponding to the hub forms a central recirculation zone.

6. The hydrogen fuel combustion chamber with a high-mixing-degree main combustion stage according to claim 5, characterized in that, It also includes a pre-combustion stage hydrogen supply pipe, which is connected to the hub. The radial inner ends of each of the swirl blades are connected to the hub, so that the pre-combustion stage hydrogen supply pipe is in fluid communication with each pre-combustion stage hydrogen injection hole.

7. The hydrogen fuel combustion chamber with a high degree of mixing main combustion stage according to claim 1, characterized in that, It also includes a main combustion stage hydrogen supply pipe, which is connected between the first main combustion stage supply area and the second main combustion stage supply area to enable fluid communication between each of the first main combustion stage hydrogen injection holes and each of the second main combustion stage hydrogen injection holes.

8. The hydrogen fuel combustion chamber with a high-mixing main combustion stage according to claim 6 or 7, characterized in that, It also includes a drain pipe, a pre-combustion stage hydrogen supply pipe and / or a main combustion stage hydrogen supply pipe extending within the drain pipe, with a first end of the drain pipe in fluid communication with the flame tube and a second end in fluid communication with an external hydrogen recovery device.

9. The hydrogen fuel combustion chamber with a high degree of mixing main combustion stage according to claim 1, characterized in that, The length of the flame tube is 2.3 ± 0.05 times its maximum diameter.

10. The hydrogen fuel combustion chamber with a high-mixing-degree main combustion stage according to claim 1, characterized in that, It also includes an igniter, which is disposed at any position in the pre-combustion stage gas supply area toward the flame tube.

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