Hydrogen-adaptable tail nozzle integrated regenerator

Abstract

This invention provides an integrated regenerator for hydrogen-compatible tail nozzles, relating to the field of high-end equipment manufacturing technology. It includes: a tail nozzle forming a gas flow channel; and a gradually changing dual-path regenerator channel, embedded between the outer and inner walls of the tail nozzle and integrally formed with it, for flowing hydrogen medium to absorb heat from the gas. The gradually changing dual-path regenerator channel includes: a hydrogen supply pipe and a hydrogen return pipe for hydrogen medium input and output, and multiple racetrack-shaped flow channels arranged axially at intervals. Each flow channel has an arc-shaped channel extending circumferentially, and also includes multiple converging channels. Each converging channel connects two adjacent racetrack-shaped flow channels, so that after the hydrogen medium flows in from one racetrack-shaped flow channel, it splits into two streams flowing in opposite directions through the arc-shaped channels on both sides, and then merges through the converging channels before entering the next racetrack-shaped flow channel, forming a dual-path meandering flow path. This invention achieves efficient recovery of gas heat from liquid hydrogen during the flow process through the gradually changing dual-path regenerator channel and the reinforced fin structure.

Description

Technical Field

[0001] This invention relates to the field of high-end equipment manufacturing technology, specifically to an integrated regenerator for hydrogen-compatible tail nozzles. Background Technology

[0002] A highly compact integrated hydrogen-powered exhaust nozzle regenerator is crucial for achieving efficient preheating of hydrogen fuel and efficient utilization of exhaust heat in hydrogen-fueled engines. Its ability to meet performance requirements directly impacts the profitability of the engine's power system. Currently, to achieve efficient utilization of exhaust heat, existing aero-engine manufacturers and research institutions have conducted extensive research on the design of regenerator structures and regeneration schemes for aero-engines.

[0003] Currently, tubular regenerators are the most commonly used regenerators in aero engines, such as the publicly disclosed U-tube regenerator. However, the publicly disclosed regenerators are relatively large in size and are usually placed as a separate component at the exhaust nozzle. This results in a large weight for the regenerator and also severely blocks the exhaust nozzle, causing significant flow losses.

[0004] However, in reality, the total pressure loss of the exhaust nozzle directly affects engine performance, especially its thrust and fuel consumption. Furthermore, exhaust nozzle components are typically subjected to direct scouring by high-temperature exhaust gases, requiring cooling structures to ensure safe and stable operation. This results in significant heat waste, which is detrimental to improving overall engine performance. Summary of the Invention

[0005] Based on this, the present invention discloses a hydrogen-compatible integrated exhaust nozzle regenerator. This novel integrated exhaust nozzle regenerator addresses the multifunctional requirements of hydrogen-fueled engines for exhaust organization, efficient exhaust heat recovery, and hydrogen heating. Under ultra-low total pressure loss (hot side) operating conditions, this integrated exhaust nozzle regenerator, while fulfilling its exhaust function, utilizes an integrated regenerating structure to recover heat from the combustion gases to achieve hydrogen heating. The novel integrated exhaust nozzle regenerator proposed in this invention achieves efficient recovery and heating of combustion gases during liquid hydrogen flow through a gradually tapered dual-path regenerating channel and wedge-shaped reinforced fins. Furthermore, the novel fin combination structure of this invention significantly improves the strength performance and service life of the integrated exhaust nozzle regenerator, ultimately fulfilling the multifunctional requirements of hydrogen-fueled engines for exhaust organization, hydrogen heating, and efficient exhaust heat recovery.

[0006] This application provides the following technical solution: an integrated regenerator for hydrogen-compatible tail nozzles, comprising:

[0007] The tail nozzle forms the gas flow channel;

[0008] A gradient dual-path regenerative channel is embedded between the outer wall and the inner wall of the tail nozzle and is integrally formed with the tail nozzle. It is used to circulate hydrogen medium to absorb the heat of the combustion gas.

[0009] The gradual dual-path regenerative channel includes: a hydrogen supply pipe and a hydrogen return pipe for hydrogen medium input and output, and a plurality of racetrack-shaped flow channels arranged at intervals along the axial direction. The hydrogen supply pipe, the racetrack-shaped flow channels and the hydrogen return pipe are connected in sequence to form the gradual dual-path regenerative channel for hydrogen medium flow. Each racetrack-shaped flow channel has an arc-shaped channel extending in the circumferential direction.

[0010] The gradient dual-path regenerative channel also includes multiple converging channels. Each converging channel is connected between two adjacent racetrack-shaped channels, so that after the hydrogen medium flows in from one racetrack-shaped channel, it splits into two streams that flow in opposite directions through the arc-shaped channels on both sides, and then merges through the converging channel before entering the next racetrack-shaped channel, forming a dual-path meandering flow path.

[0011] Furthermore, the width of the racetrack-shaped flow channel gradually increases along the flow direction of the hydrogen medium to accommodate the volume expansion of the hydrogen medium after absorbing heat.

[0012] According to one embodiment of this application, it further includes a reinforced fin assembly, wherein a partition wall is provided between two adjacent racetrack-shaped flow channels; the reinforced fin assembly includes:

[0013] An outer axially reinforced heat exchange fin and an inner axially reinforced heat exchange fin with a wedge-shaped cross-section are respectively disposed on the outer wall surface and the inner wall surface of the tail nozzle. The outer axially reinforced heat exchange fin and the inner axially reinforced heat exchange fin are respectively connected to the partition wall to form a reinforced frame.

[0014] The partition wall is located in the middle of the outer axially reinforced heat exchange fins and forms a T-shaped reinforced frame with the outer axially reinforced heat exchange fins. The partition wall is located at the connection of two adjacent inner axially reinforced heat exchange fins and forms a π-shaped reinforced frame with the inner axially reinforced heat exchange fins.

[0015] According to one embodiment of this application, the reinforced fin assembly further includes:

[0016] Reinforced outer and inner circumferential structural fins with rectangular cross-sections are respectively disposed on the outer and inner walls of the tail nozzle. The inner and outer circumferential structural fins are located on the inner and outer sides of the confluence channel, respectively. The outer axially reinforced heat exchange fins, the inner axially reinforced heat exchange fins, the inner circumferential structural fins, and the outer circumferential structural fins are coupled to each other in the confluence channel region to form a combined reinforcement structure.

[0017] According to one embodiment of this application, the hydrogen delivery pipe and the hydrogen return pipe are located in the same plane, and the hydrogen return pipe includes a vertical section and a straight section arranged along the axial direction of the tail nozzle, such that the cross-section of the hydrogen return pipe is L-shaped, and the straight section is connected to the outer wall of the tail nozzle through a reinforced support structure.

[0018] According to one embodiment of this application, the outer diameter of the hydrogen delivery pipe and the hydrogen return pipe are circular, and the inner diameter is teardrop-shaped.

[0019] According to one embodiment of this application, the width of the racetrack-shaped flow channel is determined by controlling the flow rate of the hydrogen medium to be lower than a preset threshold based on the temperature, pressure and density of the hydrogen medium in each flow channel, so as to calculate the required flow area and the corresponding racetrack-shaped flow channel width.

[0020] According to one embodiment of this application, the circumferential angle of both the outer axially reinforced heat exchange fins and the inner axially reinforced heat exchange fins is 5-15°.

[0021] Compared with the prior art, the beneficial effects achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: An integrated hydrogen-compatible exhaust nozzle regenerator according to an embodiment of the present invention addresses the multifunctional needs of hydrogen-fueled engine exhaust organization, efficient exhaust heat recovery, and hydrogen heating. Under ultra-low total pressure loss (hot side) operating conditions, this integrated exhaust nozzle regenerator, while fulfilling its exhaust function, utilizes an integrated regenerating structure to recover heat from the combustion gas to achieve hydrogen heating. The embodiments of the present invention, through axially reinforced heat exchange fins, can effectively disrupt the temperature boundary layer of the hot-side airflow, significantly improving the heat exchange performance of the regenerator while preventing icing during operation. Furthermore, the novel fin combination structure of the present invention can significantly improve the strength performance and service life of the integrated exhaust nozzle regenerator, ultimately achieving the multifunctional needs of hydrogen-fueled engine exhaust organization, hydrogen heating, and efficient exhaust heat recovery. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the integrated hydrogen tail nozzle regenerator and hydrogen medium flow according to an embodiment of the present invention.

[0024] Figure 2 This is a first partial cross-sectional view of the integrated hydrogen tail nozzle regenerator according to an embodiment of the present invention;

[0025] Figure 3 This is a second partial cross-sectional view of the integrated hydrogen tail nozzle regenerator according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the integrated regenerator assembly reinforcement structure of the hydrogen tail nozzle according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the axial fin angle of the integrated hydrogen tail nozzle regenerator according to an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of an existing conventional regenerator structure;

[0029] Among them, 1-hydrogen transport pipe, 2-hydrogen return pipe, 3-outer axially reinforced heat exchange fins, 4-outer circumferentially reinforced fins, 5-reinforced support structure, 6-inner circumferentially reinforced fins, 7-gradient dual-path heat return channel, 8-heat return channel partition wall, 9-convergence channel, 10-installation edge, 11-inner axially reinforced heat exchange fins, 12-outer wall surface of tail nozzle, 13-inner wall surface of tail nozzle. Detailed Implementation

[0030] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0031] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] This invention provides an integrated regenerator for hydrogen-compatible tail nozzles, comprising:

[0033] The tail nozzle forms the gas flow channel;

[0034] A gradient dual-path regenerative channel is embedded between the outer wall and the inner wall of the tail nozzle and is integrally formed with the tail nozzle. It is used to circulate hydrogen medium to absorb the heat of the combustion gas.

[0035] The gradual dual-path regenerative channel includes: a hydrogen supply pipe and a hydrogen return pipe for hydrogen medium input and output, and a plurality of racetrack-shaped flow channels arranged at intervals along the axial direction. The hydrogen supply pipe, the racetrack-shaped flow channels and the hydrogen return pipe are connected in sequence to form the gradual dual-path regenerative channel for hydrogen medium flow. Each racetrack-shaped flow channel has an arc-shaped channel extending in the circumferential direction.

[0036] The gradient dual-path regenerative channel also includes multiple converging channels. Each converging channel is connected between two adjacent racetrack-shaped channels, so that after the hydrogen medium flows in from one racetrack-shaped channel, it splits into two streams that flow in opposite directions through the arc-shaped channels on both sides, and then merges through the converging channel before entering the next racetrack-shaped channel, forming a dual-path meandering flow path.

[0037] Furthermore, the width of the racetrack-shaped flow channel gradually increases along the flow direction of the hydrogen medium to accommodate the volume expansion of the hydrogen medium after absorbing heat.

[0038] In one embodiment of the present invention, a reinforced fin assembly is further included, wherein a partition wall is provided between two adjacent racetrack-shaped flow channels; the reinforced fin assembly includes: an outer axially reinforced heat exchange fin and an inner axially reinforced heat exchange fin with a wedge-shaped cross-section, respectively disposed on the outer wall surface and the inner wall surface of the tail nozzle, wherein the outer axially reinforced heat exchange fin and the inner axially reinforced heat exchange fin are respectively connected to the partition wall to jointly form a reinforced frame;

[0039] The partition wall is located in the middle of the outer axially reinforced heat exchange fins and forms a T-shaped reinforced frame with the outer axially reinforced heat exchange fins. The partition wall is located at the connection of two adjacent inner axially reinforced heat exchange fins and forms a π-shaped reinforced frame with the inner axially reinforced heat exchange fins.

[0040] In one embodiment of the present invention, the reinforced fin assembly further includes: an outer circumferential reinforced fin and an inner circumferential reinforced fin with a rectangular cross-section, respectively disposed on the outer wall surface and the inner wall surface of the tail nozzle, the inner circumferential reinforced fin and the outer circumferential reinforced fin respectively located on the inner and outer sides of the confluence channel; the outer axial reinforced heat exchange fin, the inner axial reinforced heat exchange fin, the inner circumferential reinforced fin, and the outer circumferential reinforced fin are coupled to each other in the confluence channel region to form a combined reinforced structure.

[0041] In one embodiment of the present invention, the hydrogen delivery pipe and the hydrogen return pipe are located in the same plane, and the hydrogen return pipe includes a vertical section and a straight section arranged along the axial direction of the tail nozzle, so that the cross-section of the hydrogen return pipe is L-shaped, and the straight section is connected to the outer wall of the tail nozzle through a reinforced support structure.

[0042] This invention discloses an integrated hydrogen-powered exhaust nozzle regenerator that addresses the multifunctional needs of hydrogen-fueled engines, including exhaust gas organization, efficient exhaust heat recovery, and hydrogen heating. Under ultra-low total pressure loss (hot side) operating conditions, this integrated exhaust nozzle regenerator simultaneously performs its exhaust function and utilizes an integrated regenerating structure to recover heat from the combustion gases, thereby achieving hydrogen heating. The integrated exhaust nozzle regenerator proposed in this invention comprises a gradually tapering dual-path regenerating channel, wedge-shaped reinforced fins, and is integrated with the exhaust nozzle. When hydrogen flows in through the hydrogen supply pipe, it is divided into two flow paths, acting as a cold medium within the novel integrated exhaust nozzle regenerator to absorb heat from the combustion gases, thus achieving heat recovery.

[0043] In this embodiment of the invention, the gradually changing dual-path regenerative channel is embedded in the regenerator wall and integrally formed with the regenerator. The dual-path channel refers to the hydrogen medium flowing into the regenerator through a hydrogen delivery pipe, then uniformly splitting into two streams of hydrogen. These streams flow circumferentially into the opposite side of the regenerator, and then through a confluence channel into another dual-path channel ahead. This process repeats several times before converging back into the hydrogen return pipe and flowing out. As the hydrogen flows through the gradually changing dual-path regenerative channel, it absorbs heat from the combustion gas through the wall surface, thus heating the hydrogen flow. The hydrogen flow absorbs heat and its pressure decreases as it flows through the channel, causing its density to decrease and resulting in expansion. By controlling the width of the dual-path channel along the flow path, congestion in the hydrogen flow is prevented; that is, the dual-path channel has a gradually changing width.

[0044] In this embodiment of the invention, the gradient dual-path regenerative channel is embedded in the regenerator wall and integrally formed with the regenerator; at the same time, the gradient dual-path regenerative channel and the reinforced fins have a strong coupling relationship to achieve efficient heat recovery and overall structural reinforcement of the regenerator. The overall structural form, gradient size, and coupling relationship with the fins of the gradient dual-path regenerative channel include, but are not limited to, the structural configuration given in this embodiment.

[0045] The reinforced fins in this invention are divided into two categories. One category consists of axially reinforced heat exchange fins on the hot side. These fins have a wedge-shaped cross-section and enhance heat exchange between the combustion gas and the regenerator wall by controlling geometric parameters such as fin height, width, and spacing. These fins also reinforce the thin-walled structure of the regenerator. The second category consists of circumferentially reinforced fins. These fins have a rectangular cross-section and are located on both the inner and outer sides of the confluence channel to reinforce the structure at the recirculation channel wall. Furthermore, there is a coupling relationship between the axially reinforced heat exchange fins and the circumferentially reinforced fins; their combination further strengthens the structural strength of the regenerator in the fin area. This novel fin combination structure significantly improves the strength performance and service life of the integrated tailpipe regenerator, ultimately achieving the multi-functional requirements of exhaust gas organization, hydrogen heating, and efficient recovery of exhaust heat from hydrogen-fired engines.

[0046] In this embodiment of the invention, the hydrogen return pipe and the hydrogen delivery pipe are located in the same plane, effectively reducing the area obstructed from the hot-side air and lowering the total pressure loss. Both the hydrogen return pipe and the hydrogen delivery pipe have circular outer diameters and teardrop-shaped inner diameters, making them suitable for additive manufacturing. A reinforced support structure exists between the hydrogen return pipe and the regenerator wall, effectively preventing vibration damage caused by high-speed airflow scouring the hydrogen return pipe during regenerator operation.

[0047] like Figures 1-5 As shown, this embodiment of the invention uses a typical scheme of an integrated hydrogen-suitable tail nozzle regenerator as an example to illustrate the specific structure of an integrated hydrogen-suitable tail nozzle regenerator. For example... Figures 1-3 As shown, in this embodiment, the integrated hydrogen-compatible nozzle regenerator consists of a hydrogen delivery pipe 1, a hydrogen return pipe 2, outer axially reinforced heat exchange fins 3, outer circumferentially reinforced fins 4, a reinforced support structure 5, inner circumferentially reinforced fins 6, a gradient dual-path regenerator channel 7, a regenerator channel partition wall 8, a confluence channel 9, a mounting edge 10, inner axially reinforced heat exchange fins 11, and the outer wall surface 12 and inner wall surface 13 of the nozzle are integrally connected. The integrated hydrogen-compatible nozzle regenerator is connected to the turbine rear inner casing via the mounting edge 10. The gradient dual-path regenerator channel 7 consists of 12 racetrack-shaped channels with gradually changing widths and 10 confluence channels 9. Both the hydrogen delivery pipe 1 and the hydrogen return pipe 2 have circular outer diameters and teardrop-shaped inner diameters, which allows for good additive manufacturing process feasibility.

[0048] like Figure 1 As shown, this embodiment presents a typical flow scheme for hydrogen medium in an integrated hydrogen-suitable tail nozzle regenerator. The hydrogen medium flows from the regenerator's hydrogen supply pipe 1 into the racetrack-shaped channel at the rear of the gradually changing dual-path regenerator channel 7. It then splits into two streams flowing in opposite directions through the arc-shaped channels on both sides, before converging through the confluence channel 9 and entering the next racetrack-shaped channel. This cycle repeats multiple times before exiting from the hydrogen return pipe 2. While flowing through the gradually changing dual-path regenerator channel 7, the hydrogen medium undergoes flow heat exchange with the regenerator channel partition wall 8, the outer wall surface 12 of the tail nozzle, and the inner wall surface 13 of the tail nozzle, absorbing heat from the combustion gas to heat the hydrogen flow. The hydrogen flow absorbs heat and its pressure decreases as it flows through the channel, causing a decrease in hydrogen density and expansion. By controlling the width of the dual-path channel along the flow path, congestion in the hydrogen flow is prevented. The width of the gradually changing channel is determined by the following method:

[0049] Based on the design requirements for hydrogen heating, the total heat transfer power q (W) for hydrogen heating can be calculated:

[0050]

[0051] Where t1 is the total hydrogen temperature K before heat exchange, t2 is the total hydrogen temperature K after heat exchange, and c p is the specific heat capacity of hydrogen (J / (Kg·K)), and m is the mass flow rate of hydrogen (Kg / s).

[0052] The amount of heat q that the i-th runway-shaped channel needs to absorb is... i for:

[0053]

[0054] In this embodiment, the number of heat exchange channels N is assumed to be the same in each channel. However, in actual design, the heat exchange distribution of each channel can be adjusted as needed.

[0055] The effective heat exchange area A of the i-th racetrack-shaped channel i for:

[0056]

[0057] Where, r i The radius m of the inner wall of the i-th runway-shaped channel, h is the height m of the i-th runway-shaped channel, and W i Let be the width of the i-th runway-shaped channel.

[0058] The temperature T of hydrogen in the i-th racetrack-shaped channel i，h :

[0059]

[0060] Where T g Where is the gas temperature, and h is the heat transfer coefficient (W / (m²)). 2 ·K).

[0061] The hydrogen flow velocity V in the i-th raceway-shaped channel i for:

[0062]

[0063] Where r i The radius m of the inner wall of the i-th runway-shaped channel, h is the height m of the i-th runway-shaped channel, and W i Let ρ be the width of the i-th runway-shaped channel, m be the mass flow rate of hydrogen, and ρ be the mass flow rate of hydrogen. h Let P be the density of the medium and P be the pressure.

[0064] For V iThere are several limitations, the most important of which is that the current speed of sound cannot be exceeded, otherwise the hydrogen flow will become congested. Secondly, the flow velocity of hydrogen in the pipe should generally not exceed 50 m / s to avoid spontaneous combustion of hydrogen and excessive total pressure loss on the hydrogen side when the flow velocity is too high and it rubs against the wall. In this embodiment, the hydrogen flow velocity is selected as 50 m / s, resulting in a racetrack-shaped channel width of 16 mm at the inlet and 24 mm at the outlet. The two widths differ by 50%, which is a significant difference. This is due to the huge density difference of hydrogen flow under different pressures and temperatures. If the gradually changing dual-path regenerative channel of this embodiment is not used, the flow requirements of hydrogen cannot be met.

[0065] like Figure 4 As shown, a typical structure of the outer axially reinforced heat exchange fin 3 and the inner axially reinforced heat exchange fin 11 in this embodiment is given. The main function of the outer axially reinforced heat exchange fin 3 and the inner axially reinforced heat exchange fin 11 is to enhance heat exchange. The outer axially reinforced heat exchange fin 3, the inner axially reinforced heat exchange fin 11, and the regenerator channel partition wall 8 are combined to form a regenerator combined reinforced structure, as shown. Figure 4 As shown, the outer axially reinforced heat exchange fins 3 and the regenerating channel partition wall 8 combine to form a T-shaped reinforced frame, while the inner axially reinforced heat exchange fins 11 and the regenerating channel partition wall 8 form a π-shaped reinforced frame. These two reinforced frames together form a combined reinforced structure, preventing insufficient strength and damage caused by the thinning of the nozzle wall due to the gradually changing dual-path regenerating channel 7. Figure 5 As shown, in this embodiment of the invention, the circumferential angle α of the outer axially reinforced heat exchange fin 3 and the inner axially reinforced heat exchange fin 11 in the same column is 14°. The width of the outer axially reinforced heat exchange fin 3 and the inner axially reinforced heat exchange fin 11 is adapted to the gradual dual-path heat recovery channel of this embodiment, and is also a gradual width.

[0066] like Figures 1-4As shown, a typical structure is presented, consisting of an outer circumferential reinforced fin 4, a reinforced support structure 5, and an inner circumferential reinforced fin 6. The outer circumferential reinforced fin 4 and the outer axial reinforced heat exchange fin 3 are combined to form the outer reinforced structure of the regenerator in this embodiment. The inner circumferential reinforced fin 6 and the inner axial reinforced heat exchange fin 11 are combined to form the inner reinforced structure of the regenerator in this embodiment. Both reinforced structures are located in the center of the confluence channel 9. The inner and outer reinforced structures together form a U-shaped reinforced structure to significantly improve the structural strength performance at the confluence channel. A reinforced support structure 5 is provided at the connection between the confluence channel 9 and the outer wall 12 of the tail nozzle to prevent vibration damage to the hydrogen return pipe 2. The combined reinforced structure proposed in this embodiment can significantly reduce the local stress distribution of the regenerator, prevent regenerator damage, and significantly improve its service life. Without the combined reinforcement structure of this embodiment, the maximum stress at the junction channel 9 of the regenerator is 1722 MPa, causing local structural damage to the regenerator and a service life of 167 cycles. However, with the combined reinforcement structure of this embodiment, the maximum stress is 1090 MPa, a stress reduction of 36.7%, and the service life is 800 cycles, an increase of 3.8 times.

[0067] In addition to efficiently recovering the heat from the main gas flow, the integrated hydrogen tail nozzle regenerator in this embodiment can also adjust the hot end exhaust characteristics of the regenerator by changing the shape of the outer wall surface 12 and the inner wall surface 13 of the tail nozzle to change the flow direction and flow area of ​​the gas.

[0068] The integrated hydrogen tail nozzle regenerator of this invention has the following advantages:

[0069] The integrated hydrogen tail nozzle regenerator of this invention can achieve multiple functions such as exhaust gas organization, efficient recovery of exhaust heat, and hydrogen heating of a hydrogen-fired engine under ultra-low total pressure loss (hot side) operating conditions. In this embodiment, the total pressure loss of the gas on the hot side of the regenerator is no more than 0.5%, while... Figure 6 The existing conventional solution has a total pressure loss of more than 8.5%. Compared with the existing solution, this embodiment has significant advantages. The low total pressure loss can significantly improve the engine thrust and reduce fuel consumption.

[0070] The combined reinforcement structure of this embodiment can significantly reduce the stress level of the regenerator during operation and significantly improve the service life of the regenerator. Compared with the regenerator without the reinforcement structure of this embodiment, the service life of the regenerator in this embodiment is increased by 3.8 times.

[0071] The gradual dual-path regenerative channel and its design method in this embodiment effectively solve the problems of hydrogen flow congestion and excessive flow velocity caused by rapid changes in hydrogen properties.

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An integrated regenerator for hydrogen-compatible tail nozzles, characterized in that, include: The tail nozzle forms the gas flow channel; A gradient dual-path regenerative channel is embedded between the outer wall and the inner wall of the tail nozzle and is integrally formed with the tail nozzle. It is used to circulate hydrogen medium to absorb the heat of the combustion gas. The gradual dual-path regenerative channel includes: a hydrogen supply pipe and a hydrogen return pipe for hydrogen medium input and output, and a plurality of racetrack-shaped flow channels arranged at intervals along the axial direction. The hydrogen supply pipe, the racetrack-shaped flow channels and the hydrogen return pipe are connected in sequence to form the gradual dual-path regenerative channel for hydrogen medium flow. Each racetrack-shaped flow channel has an arc-shaped channel extending in the circumferential direction. The gradient dual-path regenerative channel also includes multiple converging channels. Each converging channel is connected between two adjacent racetrack-shaped channels, so that after the hydrogen medium flows in from one racetrack-shaped channel, it splits into two streams that flow in opposite directions through the arc-shaped channels on both sides, and then merges through the converging channel before entering the next racetrack-shaped channel, forming a dual-path meandering flow path. Furthermore, the width of the racetrack-shaped flow channel gradually increases along the flow direction of the hydrogen medium to accommodate the volume expansion of the hydrogen medium after absorbing heat. It also includes a reinforced fin assembly, wherein a partition wall is provided between two adjacent racetrack-shaped flow channels; the reinforced fin assembly includes: An outer axially reinforced heat exchange fin and an inner axially reinforced heat exchange fin with a wedge-shaped cross-section are respectively disposed on the outer wall surface and the inner wall surface of the tail nozzle. The outer axially reinforced heat exchange fin and the inner axially reinforced heat exchange fin are respectively connected to the partition wall to form a reinforced frame. The partition wall is located in the middle of the outer axially reinforced heat exchange fins and forms a T-shaped reinforced frame with the outer axially reinforced heat exchange fins. The partition wall is located at the connection of two adjacent inner axially reinforced heat exchange fins and forms a π-shaped reinforced frame with the inner axially reinforced heat exchange fins.

2. The integrated regenerator for hydrogen-suitable tail nozzles according to claim 1, characterized in that, The reinforced fin assembly also includes: Reinforced outer and inner circumferential structural fins with rectangular cross-sections are respectively disposed on the outer and inner walls of the tail nozzle. The inner and outer circumferential structural fins are located on the inner and outer sides of the confluence channel, respectively. The outer axially reinforced heat exchange fins, the inner axially reinforced heat exchange fins, the inner circumferential structural fins, and the outer circumferential structural fins are coupled to each other in the confluence channel region to form a combined reinforcement structure.

3. The integrated regenerator for hydrogen-suitable tail nozzles according to claim 1, characterized in that, The hydrogen delivery pipe and the hydrogen return pipe are located in the same plane, and the hydrogen return pipe includes a vertical section and a straight section arranged along the axial direction of the tail nozzle, so that the cross-section of the hydrogen return pipe is L-shaped. The straight section is connected to the outer wall of the tail nozzle through a reinforced support structure.

4. The integrated regenerator for hydrogen-suitable tail nozzles according to claim 1, characterized in that, The outer diameter of the hydrogen delivery pipe and the hydrogen return pipe are circular, and the inner diameter is teardrop-shaped.

5. The integrated regenerator for hydrogen-suitable tail nozzles according to claim 1, characterized in that, The width of the racetrack-shaped flow channel is determined by controlling the flow rate of the hydrogen medium below a preset threshold based on the temperature, pressure, and density of the hydrogen medium in each flow channel, in order to calculate the required flow area and the corresponding width of the racetrack-shaped flow channel.

6. The integrated regenerator for hydrogen-suitable tail nozzles according to claim 1, characterized in that, The circumferential angles of both the outer axially reinforced heat exchange fins and the inner axially reinforced heat exchange fins are 5-15°.

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