Hydrogen combustion chamber injection structure and hydrogen fuel combustion chamber

Abstract

The invention discloses a hydrogen combustion chamber injection structure and a hydrogen fuel combustion chamber, comprising: a head pipe network arranged at the head of a flame tube; the head pipe network comprises a plurality of annular pipes and radial pipes, the annular pipes are arranged in the same radial plane of the flame tube, the annular pipes are arranged at intervals in the radial direction of the flame tube, and the adjacent annular pipes are communicated through the multiple radial pipes; the annular pipe located on the outermost side is connected with at least one hydrogen inlet pipe, and a plurality of hydrogen output holes are formed in the annular pipes and / or the radial pipes. A gap is formed between every two adjacent radial pipes, and an air conveying channel is defined by the two annular pipes communicating with the radial pipes. A traditional flame tube head structure is replaced with the head pipe network, the axial size is greatly shortened, the weight is reduced, and the strict space requirement of an aero-engine for a compact combustion chamber is met. And the hydrogen channel is tubular and has no local flowing dead zone, so that the hydrogen in the channel is more easily and completely discharged through nitrogen blowing, and tempering can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine engines, and particularly to a hydrogen combustion chamber injection structure and a hydrogen fuel combustion chamber. Background Art

[0002] The combustion speed of hydrogen is relatively fast, the heat release is concentrated, and the flame temperature is relatively high, making it easier to produce thermal nitrogen oxides (NOx) emissions. The currently widely used technical means to reduce NOx emissions in hydrogen fuel combustion chambers is the premixed combustion mode, in which the fuel and air are pre-mixed evenly, so that the spatial distribution of the fuel is relatively dispersed, there is no local fuel enrichment area, and the heat release during combustion is also relatively dispersed, making it less likely to produce local high-temperature areas. However, premixed flames are prone to flashback, and related components are prone to ablation. In contrast, the diffusion combustion mode is not prone to flashback, but is prone to local fuel enrichment, and it is necessary to achieve the spatial discrete distribution of the fuel by reducing the fuel flow rate of a single injection hole, increasing the number and dispersion area of the injection holes.

[0003] The current hydrogen fuel combustion chambers generally achieve the premixing of hydrogen and air by arranging a premixing section at the head of the combustion chamber and arranging multiple premixing pipes in the premixing section. However, the premixing section of the hydrogen fuel combustion chamber is thick, heavy, and has a long axial length, with both large weight and volume, and is not suitable for use as an aviation product. During small engine operating conditions or engine operating condition transitions, the premixing pipes are prone to flashback, resulting in ablation and damage to engine structural components. Summary of the Invention

[0004] In view of this, the present invention provides a hydrogen combustion chamber injection structure and a hydrogen fuel combustion chamber to solve the problem that the premixing section of the current hydrogen fuel combustion chamber has a long axial length and is prone to flashback.

[0005] In a first aspect, the present invention provides a hydrogen combustion chamber injection structure, including:

[0006] A head pipe network arranged at the head of the flame tube to supply hydrogen to the hydrogen combustion chamber; the head pipe network includes an annular pipe and a radial pipe, multiple annular pipes are provided, each annular pipe is arranged in the same radial plane of the flame tube, and the annular pipes are arranged at intervals along the radial direction of the flame tube, and adjacent annular pipes are connected by multiple radial pipes;

[0007] At least one hydrogen inlet pipe is connected to the outermost annular pipe, and multiple hydrogen output holes are opened on the annular pipe and / or the radial pipe;

[0008] An air transmission channel is formed by enclosing the two annular pipes that are spaced apart between two adjacent radial pipes and are connected to them.

[0009] The beneficial effects of the above hydrogen combustion chamber injection structure are as follows: The head pipe network replaces the flame tube head structures such as the nozzle, swirler, and head wall plate of the traditional combustion chamber. The head pipe network, as an independent part, is disengaged from the flame tube. The head pipe network adopts a combined layout of annular pipes and radial pipes. Through the coplanar arrangement of multiple annular pipes and the interconnection of radial pipes, a three-dimensional fuel distribution network is formed at the head of the flame tube, and each annular pipe is arranged in the same radial plane of the flame tube, so that the axial space occupied by each annular pipe is relatively small. Compared with the traditional premixed section, the axial dimension is greatly shortened, the weight is reduced, and the stringent space requirements of aero-engines for a compact combustion chamber are met.

[0010] At the same time, the design of the annular pipes also optimizes the distribution of hydrogen, enabling hydrogen to be more evenly distributed in the combustion chamber, improving the stability and uniformity of combustion. Hydrogen is evenly ejected through multiple hydrogen output holes on the annular pipes and radial pipes. Combining with the air transmission channels formed by adjacent radial pipes and annular pipes, a mixed mode of premixing and diffusion is formed. Hydrogen and air are initially mixed in the channels, reducing the probability of local high-temperature zones and reducing the generation of thermal NOx. The remaining hydrogen is directly sprayed into the combustion chamber through the output holes, avoiding the risk of fuel enrichment in the traditional premixed section. At the same time, hydrogen is injected in a small flow rate through multiple hydrogen output holes, further suppressing local high temperatures.

[0011] Moreover, the annular pipes and radial pipes in the present invention are hydrogen channels. Compared with the structure where the hydrogen channel is box-shaped, the hydrogen channel is tubular, the flow channel is continuous and smooth, there is no local flow dead zone, the pipeline channel is more regular, the storage volume is smaller, and it is easier to expel the hydrogen in the channel completely by purging with nitrogen, and it is not easy to store the hydrogen-air mixture, thus being able to avoid flashback. In addition, the tubular structure is more conducive to heat dissipation.

[0012] In an alternative embodiment, the cross-section of the annular pipe is circular; the annular pipe is formed by bending a single straight pipe end to end into a circular ring.

[0013] In an alternative embodiment, one side of the radial pipe is the windward side, and the other side of the radial pipe is the leeward side; multiple groups of axial hydrogen output holes are arranged along the axial direction of the flame tube on the leeward side of the radial pipe.

[0014] The beneficial effects of the above technical solution are as follows: The injection direction of the axial hydrogen output holes is the same as the main air flow direction, and hydrogen is not easily reversed into the pipe network, significantly reducing the probability of flashback.

[0015] In an alternative embodiment, in the radial plane of the flame tube where the center line of the radial pipe is located, multiple groups of circumferential hydrogen output holes are arranged along the circumferential direction of the flame tube on the radial pipe.

[0016] The beneficial effects of the above technical solution are as follows: The circumferential hydrogen output holes are evenly arranged along the circumferential direction of the flame tube, enabling the full-circumference symmetric injection of hydrogen in the circumferential direction of the combustion chamber, avoiding the formation of local enrichment regions, promoting the rapid mixing of hydrogen and air in the circumferential direction, and enhancing flame stability and combustion efficiency.

[0017] In an alternative embodiment, three annular pipes are provided, which are the first annular pipe, the second annular pipe, and the third annular pipe from the outside to the inside in sequence.

[0018] In an alternative embodiment, in the radial plane of the flame tube where the center line of the radial pipe is located, the first annular pipe, the second annular pipe, and the third annular pipe are provided with a plurality of radial hydrogen output holes in the radial direction;

[0019] The radial hydrogen output holes on the first annular pipe are close to the inner diameter side of the first annular pipe; the radial hydrogen output holes on the third annular pipe are close to the outer diameter side of the third annular pipe; the second annular pipe is provided with radial hydrogen output holes on both the inner diameter side and the outer diameter side.

[0020] The beneficial effects of the above technical solution are as follows: The hydrogen output from the radial hydrogen output holes and the air are rapidly mixed in the radial direction, enhancing flame stability and combustion efficiency.

[0021] In a second aspect, the present invention provides a hydrogen fuel combustion chamber, including:

[0022] A flame tube;

[0023] A hydrogen combustion chamber injection structure, which is arranged at the head of the flame tube.

[0024] In an alternative embodiment, the flame tube includes:

[0025] An inner ring of the flame tube;

[0026] An outer ring of the flame tube, and both the outer ring of the flame tube and the inner ring of the flame tube are coaxially arranged with the engine shaft;

[0027] The outer ring of the flame tube is arranged on the periphery of the inner ring of the flame tube, and there is a spacing between the outer ring of the flame tube and the inner ring of the flame tube to form a mixing space, and the hydrogen combustion chamber injection structure is arranged at the head position of the mixing space.

[0028] In an alternative embodiment, the hydrogen combustion chamber injection structure is positioned on the outer ring of the flame tube through a plurality of distance sleeves;

[0029] The distance sleeve includes a first straight section, a bending section, and a second straight section that are integrally connected; a clamping space is formed between the bending section and the first straight section and the second straight section, and the outermost annular pipe in the hydrogen combustion chamber injection structure is positioned in the clamping space;

[0030] The second straight segment is located inside the first straight segment, and the bent segment protrudes inward relative to the second straight segment; bolt holes are provided on the first straight segment and the second straight segment, and the first straight segment and the second straight segment are connected to the outer ring of the flame tube through bolts passing through the bolt holes.

[0031] In an optional embodiment, there is a first gap suitable for air to pass through between the outermost ring pipe in the hydrogen combustion chamber injection structure and the inner side wall of the outer ring of the flame tube;

[0032] And / or, there is a second gap suitable for air to pass through between the innermost ring pipe in the hydrogen combustion chamber injection structure and the outer side wall of the inner ring of the flame tube.

[0033] The beneficial effects of the above technical solution are as follows: The air intake of the head pipe network accounts for 80-90% of the air intake of the flame tube, and the total pressure loss of the combustion chamber can be finely adjusted by adjusting the gap width between the head pipe network and the inner and outer rings of the flame tube.

[0034] In summary, the technical solution of the present invention has the following advantages:

[0035] The present invention can disperse and inject fuel into the combustion chamber from the radial hydrogen output holes, circumferential hydrogen output holes, and axial hydrogen output holes, realizing the spatial dispersion of the fuel, making the spatial distribution of the fuel more uniform, reducing the possibility of local fuel concentration, thereby reducing the probability of generating local high-temperature areas and reducing local high-temperature areas. Compared with the prior art, it has the advantages of low pollution emissions, simple structure, light weight, convenient processing and inspection, and low processing accuracy requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 It is the front view of the present invention.

[0038] Figure 2 For the present invention Figure 1 View A.

[0039] Figure 3 For the present invention Figure 1 View B.

[0040] Figure 4 For the present invention Figure 1 Cross-sectional view taken along line C-C.

[0041] Figure 5 For the present invention Figure 1 is a partial enlarged view of the circular area in the present invention.

[0042] Figure 6 is a schematic structural diagram of the fixed-distance sleeve of the present invention.

[0043] Explanation of reference numerals in the drawings:

[0044] 1. Head pipe network; 101. First ring pipe; 102. Second ring pipe; 103. Third ring pipe; 104. Radial pipe; 105. Hydrogen inlet pipe; 106. Axial hydrogen output hole; 107. Circumferential hydrogen output hole; 108. Radial hydrogen output hole; 109. Air transmission channel; 2. Outer ring of the flame tube; 3. Inner ring of the flame tube; 4. Fixed-distance sleeve, 401. Bolt hole, 402. First straight section, 403. Bending section, 404. Second straight section, 405. Clamping space; 5. First gap; 6. Second gap. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] Generally, the hydrogen fuel combustor in the current technology realizes the premixing of hydrogen and air by arranging a premixing section at the head of the combustor and arranging multiple premixing pipes in the premixing section. However, the premixing section of the hydrogen fuel combustor is thick, heavy, and has a long axial length, with both large weight and volume, and is not suitable for use as an aviation product.

[0047] Based on this, the present invention provides a hydrogen injection structure applicable to a hydrogen fuel gas turbine engine, which has the characteristics of simple processing, low cost, wide stable combustion boundary, and low combustion pollutant emissions. It is beneficial to improve the disadvantages of high nitrogen oxide (NOx) emissions, high local wall temperature of the flame tube, and unsuitability for variable operating conditions of the engine in the hydrogen fuel combustor. The present invention replaces the nozzle, swirler, and head wall plate and other flame tube head structures of the traditional combustor with the head pipe network 1, greatly shortening the axial dimension and reducing the weight.

[0048] During small engine operating conditions or engine operating condition transitions, the premixing pipe is prone to flashback, resulting in ablation and damage of engine structural components.

[0049] Based on this, the hydrogen channel of the present invention is tubular, without local flow dead zones. The pipeline channel is more regular and has a smaller storage volume, making it easier to blow out the hydrogen in the channel completely with nitrogen purge, and it is not easy to store hydrogen-air mixture, thereby being able to avoid flashback.

[0050] According to an embodiment of the present invention, in a first aspect, a hydrogen combustion chamber injection structure is provided, which is placed at the head of the flame tube to provide hydrogen supply to the combustion chamber, and is particularly suitable for hydrogen fuel gas turbine engines with a wide operating range.

[0051] Combined Figures 1 to 6 As shown, the hydrogen combustion chamber injection structure includes a head pipe network 1, and the head pipe network 1 is arranged at the head of the flame tube to provide hydrogen supply to the hydrogen combustion chamber.

[0052] The head pipe network 1 includes an annular pipe and radial pipes 104. There are multiple annular pipes, and each annular pipe is arranged in the same radial plane of the flame tube, and the annular pipes are arranged at intervals along the radial direction of the flame tube. Adjacent two annular pipes are connected by multiple radial pipes 104, and the annular pipe and the radial pipe 104 are fixedly welded.

[0053] The outermost annular pipe is connected with at least one hydrogen inlet pipe 105. One end of the hydrogen inlet pipe 105 is communicated with the outermost annular pipe, and the other end of the hydrogen inlet pipe 105 is communicated with the hydrogen supply system, so that hydrogen can be supplied to each annular pipe and each radial pipe 104 through the hydrogen inlet pipe 105.

[0054] A plurality of hydrogen output holes are opened on the annular pipe and / or the radial pipe 104, so that hydrogen can be discharged from the hydrogen output holes.

[0055] A spacing exists between adjacent two radial pipes 104, and the two annular pipes connected thereto enclose an air transmission channel 109, so that air can be transmitted from the air transmission channel 109 into the hydrogen combustion chamber and mixed with hydrogen.

[0056] In the above hydrogen combustion chamber injection structure, the head pipe network 1 replaces the nozzle, the swirler, and the head wall plate and other flame tube head structures of the traditional combustion chamber. The head pipe network 1 is an independent part and is separated from the flame tube. The head pipe network adopts a combined layout of annular pipes and radial pipes. Through the co-planar arrangement of multiple annular pipes and the interconnection of radial pipes, a three-dimensional fuel distribution network is formed at the head of the flame tube, and each annular pipe is arranged in the same radial plane of the flame tube, so that the axial space occupied by each annular pipe is small. Compared with the traditional premixed section, the axial dimension is greatly shortened, the weight is reduced, and the strict space requirements of the aeroengine for a compact combustion chamber are met.

[0057] Meanwhile, the design of the annular pipe also optimizes the distribution of hydrogen, enabling hydrogen to be more evenly distributed in the combustion chamber, thereby enhancing the stability and uniformity of combustion. Hydrogen is evenly ejected through multiple hydrogen output holes on the annular pipe and the radial pipes. Combining with the air transmission channels formed by adjacent radial pipes and the annular pipe, a mixed mode of premixing and diffusion is formed. Hydrogen and air are preliminarily mixed in the channels, reducing the probability of local high-temperature areas and decreasing the generation of thermal NOx. The remaining hydrogen is directly injected into the combustion chamber through the output holes, avoiding the risk of fuel enrichment in the traditional premixing section. Meanwhile, hydrogen is injected in small flows through multiple hydrogen output holes, further suppressing local high temperatures.

[0058] Moreover, in this embodiment, the annular pipe and the radial pipes 104 are hydrogen channels. Compared with the box-shaped structure of the hydrogen channel, the hydrogen channel is tubular, with a continuous and smooth flow path, no local flow dead zones, a more regular pipe channel, and a smaller storage volume. It is easier to purge the hydrogen in the channel completely by nitrogen blowing, and it is not easy to store hydrogen-air mixtures (hydrogen volume concentrations from 4% to 75% are all combustible, but those greater than 75% are not). Furthermore, it can avoid flashback. Additionally, the tubular structure is more conducive to heat dissipation.

[0059] In some embodiments, the cross-section of the annular pipe is circular; the annular pipe is formed by bending a single straight pipe end to end into a circular ring. The cross-section of the radial pipe is circular. The circular cross-section annular pipe in this embodiment is seamlessly bent from a single straight pipe. In addition, bending a single straight pipe end to end into a circular ring not only simplifies the manufacturing process, reduces the manufacturing cost, but also improves the reliability and durability of the structure. This design enables the hydrogen fuel combustion chamber to have better performance and a longer service life in applications such as aeroengines.

[0060] As an alternative embodiment, the cross-sections of the annular pipe and the radial pipes can also be elliptical, rectangular, etc. The center line of the radial pipe can be a straight line, or it can be spliced by multiple straight lines, an involute, an arc curve, or spliced by multiple curves; the center line of the radial pipe can be arranged linearly along the radial direction of the engine, or it can be arranged in an involute or arc curve along the radial direction of the engine or at a certain angle to the radial direction. It should be noted that in this embodiment, the axial direction of the engine is consistent with the axial direction of the flame tube.

[0061] In some embodiments, one side of the radial pipe 104 is the windward side ( Figure 1 in the A direction in Figure 1 ), and the other side of the radial pipe 104 is the leeward side ( Figure 3 in the B direction in

[0062] ). As shown inFigure 4 As shown, in the radial plane of the combustion chamber where the center line of the radial pipe 104 is located, multiple sets of circumferential hydrogen output holes 107 are provided along the circumferential direction of the combustion chamber (i.e., the circumferential direction of the engine) on the radial pipe 104. The circumferential hydrogen output holes 107 are evenly arranged along the circumferential direction of the combustion chamber, which can achieve the full-circumference symmetric injection of hydrogen in the circumferential direction of the combustion chamber, avoid the formation of local enrichment regions, promote the rapid mixing of hydrogen and air in the circumferential direction, and improve the flame stability and combustion efficiency.

[0063] In some embodiments, in combination with Figure 2 As shown, there are three annular pipes, which are the first annular pipe 101, the second annular pipe 102, and the third annular pipe 103 from the outside to the inside in sequence. The radial pipe 104 is a short straight pipe, and the radial pipes 104 are distributed between the first annular pipe 101 and the second annular pipe 102 and between the second annular pipe 102 and the third annular pipe 103, connecting the three annular pipes and being internally interconnected. A number of hydrogen inlet pipes 105 are welded to the outside of the first annular pipe 101 and are interconnected with it.

[0064] In the radial plane of the combustion chamber where the center line of the radial pipe 104 is located, the first annular pipe 101, the second annular pipe 102, and the third annular pipe 103 are provided with a plurality of radial hydrogen output holes 108 in the radial direction. Among them, the radial hydrogen output holes 108 on the first annular pipe 101 are close to the inner diameter side of the first annular pipe 101; the radial hydrogen output holes 108 on the third annular pipe 103 are close to the outer diameter side of the third annular pipe 103; the second annular pipe 102 is provided with radial hydrogen output holes 108 on both the inner diameter side and the outer diameter side. The hydrogen output from the radial hydrogen output holes 108 mixes rapidly with air in the radial direction, improving the flame stability and combustion efficiency.

[0065] In some embodiments, hydrogen is supplied to the head pipe network through a number of hydrogen inlet pipes 105. The inlet pipes can be connected to any position of the head pipe network. Preferably, they can be symmetrically connected to the pipes arranged along the circumferential direction.

[0066] In the above hydrogen combustion chamber injection structure, the hydrogen channel is tubular, and the flashback risk is smaller. The radial pipe 104 can generate a continuous and unsteady small vortex system in the form of von Kármán vortex streets downstream, which is more beneficial to hydrogen mixing and has a smaller pressure loss. It should be noted that von Kármán vortex streets are periodic vortices generated behind a cylinder after the fluid flows past the cylinder.

[0067] The pipe network type head is composed of pipes arranged in a circumferential and radial staggered manner, and the pipes are interconnected with each other. Multiple sets of hydrogen output holes are opened in different positions of the pipes along the axial, radial, and circumferential directions to ensure that the fuel can be injected into the combustion chamber from multiple directions (axial, radial, circumferential), avoid local mixing dead angles, and the injected hydrogen is mixed with the air entering through the air transmission channels 109 in small areas, making the mixing speed of fuel and air faster and the mixing more uniform.

[0068] According to an embodiment of the present invention, in a second aspect, a hydrogen fuel combustion chamber is provided, which includes a flame tube and a hydrogen combustion chamber injection structure. The hydrogen combustion chamber injection structure is disposed at the head of the flame tube.

[0069] The flame tube includes an inner flame tube ring 3 and an outer flame tube ring 2. Both the outer flame tube ring 2 and the inner flame tube ring 3 are coaxially arranged with the engine shaft. The outer flame tube ring 2 is disposed on the periphery of the inner flame tube ring 3, and there is a gap between the outer flame tube ring 2 and the inner flame tube ring 3 to form a mixing space, and the hydrogen combustion chamber injection structure is disposed at the head position of the mixing space.

[0070] In some embodiments, the hydrogen combustion chamber injection structure is positioned on the outer flame tube ring 2 through a plurality of spacer sleeves 4.

[0071] The spacer sleeve 4 is formed by bending a long strip of metal. The spacer sleeve 4 includes a first straight section 402, a bending section 403, and a second straight section 404 that are integrally connected. A clamping space 405 is formed between the bending section 403 and the first straight section 402 and the second straight section 404, and the outermost ring pipe in the hydrogen combustion chamber injection structure is positioned in the clamping space 405. The second straight section 404 is located inside the first straight section 402, and the bending section 403 protrudes inward relative to the second straight section 404; bolt holes 401 are provided on the first straight section 402 and the second straight section 404, the second straight section 404 abuts against the outer wall of the outer flame tube ring 2, and the first straight section 402 and the second straight section 404 are connected to the outer flame tube ring 2 through bolts or pins passing through the bolt holes 401. Combining Figure 2 As shown, a plurality of spacer sleeves 4 can be arranged circumferentially, and the spacer sleeves 4 can be welded to the head pipe network 1 to form an integral body.

[0072] In some embodiments, there is a first gap 5 suitable for air passage between the outermost ring pipe in the hydrogen combustion chamber injection structure and the inner side wall of the outer flame tube ring 2.

[0073] There is a second gap 6 suitable for air passage between the innermost ring pipe in the hydrogen combustion chamber injection structure and the outer side wall of the inner flame tube ring 3.

[0074] The air intake of the head pipe network 1 accounts for 80 - 90% of the air intake of the flame tube, and the total pressure loss of the combustion chamber can be finely adjusted by adjusting the gap width between the head pipe network 1 and the inner and outer rings of the flame tube.

[0075] Combining Figure 5As shown in the figure, the specific working process of the above hydrogen combustion chamber injection structure is as follows: A part of the air can enter the inside of the combustion chamber along the first gap 5 between the head pipe network 1 and the outer ring 2 of the flame tube, and a part of the air can enter the inside of the combustion chamber along the second gap 6 between the head pipe network 1 and the inner ring 3 of the flame tube. A part of the air can enter the inside of the combustion chamber along the fan-shaped cavity between adjacent radial pipes 104. Hydrogen enters the first ring pipe 101, the radial pipe 104, the second ring pipe 102, and the third ring pipe 103 through the hydrogen inlet pipe 105, and is ejected along the axially opened axial hydrogen output hole 106, the circumferentially opened circumferential hydrogen output hole 107, and the radially opened radial hydrogen output hole 108, and enters the combustion chamber under the purging of the air, and burns after mixing with the air.

[0076] According to the hydrogen combustion chamber injection structure and the hydrogen fuel combustion chamber of the present invention, the fuel can be dispersed and injected into the combustion chamber from the radial hydrogen output hole, the circumferential hydrogen output hole, and the axial hydrogen output hole, realizing the spatial dispersion of the fuel, making the spatial distribution of the fuel more uniform, reducing the possibility of local fuel concentration, thereby reducing the probability of generating local high-temperature areas and reducing local high-temperature areas. Compared with the prior art, it has the advantages of low pollution emissions, simple structure, light weight, convenient processing and inspection, and low processing accuracy requirements. And the air inlet area of the present invention is larger, the air intake is more, the equivalence ratio is smaller, and it is easier to reduce NOx emissions. The processing of hydrogen channels such as the annular pipe and the radial pipe is more convenient, the expandability of the hydrogen channel and the hydrogen injection hole is stronger, and the volume and weight are smaller.

[0077] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A hydrogen combustion chamber injection structure, characterized in that, Comprising: A head pipe network (1), the head pipe network (1) being arranged at the head of the flame tube to supply hydrogen to the hydrogen combustion chamber; The head pipe network (1) includes an annular pipe and radial pipes (104), there are multiple annular pipes provided, each annular pipe is arranged in the same radial plane of the flame tube, and each annular pipe is arranged at intervals along the radial direction of the flame tube, and adjacent two annular pipes are connected by a plurality of radial pipes (104); At least one hydrogen inlet pipe (105) is connected to the outermost annular pipe, and a plurality of hydrogen output holes are formed on the annular pipe and / or the radial pipes (104); An air transmission channel (109) is formed by enclosing two annular pipes that have a spacing between two adjacent radial pipes (104) and are connected to them.

2. The hydrogen combustion chamber injection structure according to claim 1, wherein The cross-section of the annular pipe is circular; the annular pipe is formed by bending a single straight pipe end to end into a circular ring.

3. The hydrogen combustion chamber injection structure according to claim 1, characterized in that, One side of the radial pipe (104) is the windward side, and the other side of the radial pipe (104) is the leeward side; a plurality of groups of axial hydrogen output holes (106) are formed along the axial direction of the flame tube on the leeward side of the radial pipe (104).

4. The hydrogen combustion chamber injection structure according to claim 1, characterized in that, In the radial plane of the flame tube where the center line of the radial pipe (104) is located, a plurality of groups of circumferential hydrogen output holes (107) are formed along the circumferential direction of the flame tube on the radial pipe (104).

5. The hydrogen combustion chamber injection structure according to any one of claims 1-4, characterized in that, There are three annular pipes provided, which are the first annular pipe (101), the second annular pipe (102) and the third annular pipe (103) in order from outside to inside.

6. The hydrogen combustion chamber injection structure according to claim 5, characterized in that, In the radial plane of the flame tube where the center line of the radial pipe (104) is located, a plurality of radial hydrogen output holes (108) are formed on the first annular pipe (101), the second annular pipe (102) and the third annular pipe (103) in the radial direction; The radial hydrogen output holes (108) on the first annular pipe (101) are close to the inner diameter side of the first annular pipe (101); the radial hydrogen output holes (108) on the third annular pipe (103) are close to the outer diameter side of the third annular pipe (103); the second annular pipe (102) is provided with radial hydrogen output holes (108) on both the inner diameter side and the outer diameter side.

7. A hydrogen fuel combustion chamber, characterized in that, Comprising: A flame tube; The hydrogen combustion chamber injection structure according to any one of claims 1-6, the hydrogen combustion chamber injection structure being arranged at the head of the flame tube.

8. The hydrogen fuel combustion chamber according to claim 7, characterized in that The flame tube includes: An inner ring of the flame tube (3); An outer ring of the flame tube (2), the outer ring of the flame tube (2) and the inner ring of the flame tube (3) are both arranged coaxially with the engine shaft; The outer ring of the flame tube (2) is arranged on the periphery of the inner ring of the flame tube (3), there is a spacing between the outer ring of the flame tube (2) and the inner ring of the flame tube (3) and a mixing space is formed, and the hydrogen combustion chamber injection structure is arranged at the head position of the mixing space.

9. The hydrogen fuel combustion chamber according to claim 8, characterized in that, The hydrogen combustion chamber injection structure is positioned on the outer ring of the flame tube (2) through a plurality of distance sleeves (4); The distance sleeve (4) includes a first straight section (402), a bending section (403) and a second straight section (404) that are integrally connected; a clamping space (405) is formed between the bending section (403) and the first straight section (402) and the second straight section (404), and the outermost annular pipe in the hydrogen combustion chamber injection structure is positioned in the clamping space (405); The second straight segment (404) is located inside the first straight segment (402), and the bent segment (403) protrudes inward relative to the second straight segment (404); bolt holes (401) are provided on the first straight segment (402) and the second straight segment (404), and the first straight segment (402) and the second straight segment (404) are connected to the outer ring (2) of the combustion chamber by bolts passing through the bolt holes (401).

10. The hydrogen fuel combustion chamber according to claim 8 or 9, characterized in that, A first gap (5) suitable for air to pass through is provided between the outermost ring pipe in the hydrogen combustion chamber injection structure and the inner wall of the outer ring (2) of the combustion chamber; and / or, a second gap (6) suitable for air to pass through is provided between the innermost ring pipe in the hydrogen combustion chamber injection structure and the outer wall of the inner ring (3) of the combustion chamber.

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