Hydrogen nozzle flow consistency measuring device of hydrogen internal combustion engine

Abstract

The utility model discloses a hydrogen nozzle flow consistency measuring device of a hydrogen internal combustion engine, which relates to the technical field of hydrogen internal combustion engines and comprises a hydrogen supply module, a hydrogen injection module, a schlieren system, a nitrogen supply module, a control module and an exhaust module. The output end of the hydrogen supply module and the output end of the nitrogen supply module are connected with the input end of the hydrogen injection module, the output end of the hydrogen injection module is connected with the input end of the exhaust module, the schlieren system is arranged in the hydrogen injection module, and the hydrogen supply module, the hydrogen injection module and the nitrogen supply module are all connected with the control module. According to the hydrogen nozzle flow consistency measuring device of the hydrogen internal combustion engine, whether the nozzles are consistent or not is judged by means of the containing bomb and the schlieren system, and various performance indexes of the hydrogen engine can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen internal combustion engines, in particular to a device for measuring the flow consistency of hydrogen nozzles of a hydrogen internal combustion engine. Background Technique

[0002] Hydrogen internal combustion engines use hydrogen fuel instead of traditional fuel oil. Hydrogen fuel has high energy density and low emission characteristics and is widely regarded as an important candidate in the future clean energy field. In the hydrogen fuel injection system, the nozzle plays a key role. The nozzle is responsible for introducing hydrogen fuel into the combustion chamber of the internal combustion engine with appropriate flow rate and pressure. The consistency of nozzle flow rate refers to the consistency of the fuel flow rates output by multiple nozzles under the same working conditions. If the nozzle flow rate consistency does not meet the standard, it will increase the cyclic variation and reduce the combustion stability, thereby affecting the overall thermal efficiency of the engine. In order to ensure the consistency of nozzle flow rate, it is necessary to measure and calibrate the nozzle flow rate.

[0003] Traditional methods usually use flow measurement devices such as flow meters and differential pressure gauges. However, these devices can measure the flow rate of a single nozzle, but it is difficult to judge whether the flow rates of each nozzle are consistent when multiple nozzles work simultaneously. At the same time, due to the very small amount of hydrogen injected each time, the accuracy of existing flow meters within their measurement ranges is poor, and traditional measurement methods for gasoline or diesel nozzles may have errors, resulting in inaccurate measurement results. In addition, since the formation of the hydrogen-air mixture directly affects the performance and emission characteristics of the hydrogen internal combustion engine, and the formation of the mixture is affected by the jet shape of the nozzle. Therefore, the consistency test of the injection cone angle and the jet penetration distance is crucial for the formation of the hydrogen-air mixture in the hydrogen internal combustion engine. Content of the Utility Model

[0004] The purpose of the utility model is to provide a device for measuring the flow consistency of hydrogen nozzles of a hydrogen internal combustion engine. With the help of a bomb and a schlieren system, the flow rate and jet shape of the nozzle can be tested simultaneously, and whether each nozzle has consistency can be further judged through key jet parameters, reducing the differences in the formation and distribution of the mixture in each cylinder of the hydrogen internal combustion engine, and helping to improve the performance indicators of the hydrogen engine.

[0005] To achieve the above purpose, the utility model provides a device for measuring the flow consistency of hydrogen nozzles of a hydrogen internal combustion engine, including: a hydrogen supply module, a hydrogen injection module, a nitrogen supply module, a control module, a schlieren system and an exhaust module; the output ends of the hydrogen supply module and the nitrogen supply module are connected to the input end of the hydrogen injection module, the output end of the hydrogen injection module is connected to the input end of the exhaust module, the output end of the hydrogen injection module is connected to the exhaust module, the schlieren system is arranged in the hydrogen injection module, and the hydrogen supply module, the hydrogen injection module and the nitrogen supply module are all connected to the control module.

[0006] Preferably, the hydrogen supply module includes a hydrogen cylinder bank, a hydrogen filter, a first hydrogen supply pipeline ball valve, a primary hydrogen pressure reducing valve, a second hydrogen supply pipeline ball valve, a secondary hydrogen pressure reducing valve, a third hydrogen supply pipeline ball valve, a hydrogen check valve, and a hydrogen track;

[0007] A hydrogen supply pipeline is provided between the hydrogen cylinder bank and the hydrogen track, and the hydrogen supply pipeline is sequentially connected to the hydrogen cylinder bank, the hydrogen filter, the first hydrogen supply pipeline ball valve, the primary hydrogen pressure reducing valve, the second hydrogen supply pipeline ball valve, the secondary hydrogen pressure reducing valve, the third hydrogen supply pipeline ball valve, the hydrogen check valve, and the hydrogen track.

[0008] Preferably, the hydrogen injection module includes a hydrogen nozzle and a bomb, the hydrogen nozzle is connected to the hydrogen track, and the bomb is embeddedly connected to one end of the hydrogen nozzle away from the hydrogen track.

[0009] Preferably, the schlieren system includes: a light source, a plane mirror, a concave mirror, a knife edge, and a high-speed camera;

[0010] The light source emits light to a first reflector, the first reflector refracts the light to a first concave mirror provided at the top of the bomb, the first concave mirror provided at the top of the bomb focuses the refracted light to pass through the bomb to a second concave mirror provided at the bottom thereof, the second concave mirror provided at the bottom of the bomb transmits the light to a second reflector near the knife edge, the second reflector near the knife edge refracts the light to be cut by the knife edge, and the high-speed camera captures the light after being cut by the knife edge.

[0011] Preferably, the nitrogen supply module includes a nitrogen cylinder bank and a nitrogen supply pipeline. The nitrogen cylinder bank is connected to a first nitrogen supply pipeline ball valve through a nitrogen supply pipeline. One end of the first nitrogen supply pipeline ball valve away from the nitrogen cylinder bank is connected to a nitrogen pressure reducing valve. One end of the nitrogen pressure reducing valve away from the first nitrogen supply pipeline ball valve is connected to a second nitrogen supply pipeline ball valve. One end of the second nitrogen supply pipeline ball valve away from the nitrogen pressure reducing valve is connected to a nitrogen check valve.

[0012] Preferably, the exhaust module includes a first exhaust pipeline, a second exhaust pipeline, and a vacuum pump. The vacuum pump is provided at one end of the first exhaust pipeline. One end of the first exhaust pipeline away from the vacuum pump is connected to the bomb. The second exhaust pipeline is connected to the end of the hydrogen track. Exhaust pipeline ball valves are provided on both the first exhaust pipeline and the second exhaust pipeline.

[0013] Preferably, the vacuum pump exhausts the gas in the bomb through the first exhaust pipeline to form a vacuum state inside the bomb.

[0014] Preferably, the control module includes a data acquisition system and a computer. The computer is connected to the output end of the data acquisition system. The input end of the data acquisition system is connected with a pressure sensor and a temperature sensor. The input end of the temperature sensor is connected to the bomb. The input end of the pressure sensor is respectively connected to the hydrogen pipeline, the nitrogen supply pipeline near the hydrogen nozzle, and the exhaust pipeline near the bomb.

[0015] Preferably, the control module is used to adjust the pressures in the hydrogen pipeline and the nitrogen supply pipeline and control the hydrogen nozzle.

[0016] Preferably, the high-speed camera is connected to the input end of the data acquisition system.

[0017] Therefore, the hydrogen nozzle flow consistency measurement device of a hydrogen internal combustion engine adopting the above structure in the present invention can test the sealing performance, flow characteristics, and jet characteristics of the hydrogen nozzle separately without relying on an engine test bench. With the help of the bomb and the schlieren system, the flow rate and jet form of the nozzle can be tested simultaneously. By further judging whether each nozzle has consistency through key jet parameters, it can guide the design rationality of the hydrogen pipeline, the sealing characteristics, flow characteristics, and jet characteristics of the hydrogen nozzle, reduce the differences in the formation and distribution of the air-fuel mixture in each cylinder of the hydrogen internal combustion engine, and help improve the performance indexes of the hydrogen engine.

[0018] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0019] Figure 1 It is a module schematic diagram of an embodiment of the hydrogen nozzle flow consistency measurement device of a hydrogen internal combustion engine according to the present invention;

[0020] Figure 2 It is a structural schematic diagram of an embodiment of the hydrogen nozzle flow consistency measurement device of a hydrogen internal combustion engine according to the present invention;

[0021] Figure 3 It is a working principle diagram of the schlieren system of an embodiment of the hydrogen nozzle flow consistency measurement device of a hydrogen internal combustion engine according to the present invention;

[0022] Figure 4 It is a front view of an embodiment of the hydrogen nozzle flow consistency measurement device of a hydrogen internal combustion engine according to the present invention;

[0023] Figure 5 It is a rear view of an embodiment of the hydrogen nozzle flow consistency measurement device of a hydrogen internal combustion engine according to the present invention;

[0024] Reference Signs

[0025] 1. Hydrogen supply module; 2. Hydrogen injection module; 3. Schlieren system; 4. Nitrogen supply module; 5. Control module; 6. Exhaust module; 11. Hydrogen cylinder group; 12. Hydrogen filter; 13. First hydrogen supply pipeline ball valve; 14. Primary hydrogen pressure reducing valve; 15. Second hydrogen supply pipeline ball valve; 16. Secondary hydrogen pressure reducing valve; 17. Third hydrogen supply pipeline ball valve; 18. Hydrogen check valve; 19. Hydrogen rail; 20. Hydrogen supply pipeline; 21. Hydrogen nozzle; 22. Bomb; 31. Light source; 32. First reflector; 33. First concave mirror; 34. Second concave mirror; 35. Second reflector; 36. Knife edge; 37. High-speed camera; 41. Nitrogen cylinder group; 42. Nitrogen supply pipeline; 43. First nitrogen supply pipeline ball valve; 44. Nitrogen pressure reducing valve; 45. Second nitrogen supply pipeline ball valve; 46. Nitrogen check valve; 51. Data acquisition system; 52. Computer; 53. Pressure sensor; 54. Temperature sensor; 61. First exhaust pipeline; 62. Second exhaust pipeline; 63. Vacuum pump; 64. Exhaust pipeline ball valve. Detailed implementation mode

[0026] The technical solution of the present utility model will be further described below with reference to the drawings and embodiments.

[0027] Unless otherwise defined, the technical terms or scientific terms used in the present utility model shall have the ordinary meanings understood by those with ordinary skills in the field to which the present utility model belongs. The "first", "second" and similar terms used in the present utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] As Figures 1-5 shown, a device for measuring the flow consistency of a hydrogen nozzle for a hydrogen internal combustion engine includes: a hydrogen supply module 1, a hydrogen injection module 2, a Schlieren system 3, a nitrogen supply module 4, a control module 5 and an exhaust module 6; the output ends of the hydrogen supply module 1 and the nitrogen supply module 4 are connected to the input end of the hydrogen injection module 2, the output end of the hydrogen injection module 2 is connected to the input end of the exhaust module 6, the output end of the hydrogen injection module 2 is connected to the exhaust module 6, the Schlieren system 3 is arranged in the hydrogen injection module 2, and the hydrogen supply module 1, the hydrogen injection module 2 and the nitrogen supply module 4 are all connected to the control module 5.

[0029] The hydrogen supply module 1 includes a hydrogen cylinder group 11, a hydrogen filter 12, a first hydrogen supply pipeline ball valve 13, a primary hydrogen pressure reducing valve 14, a second hydrogen supply pipeline ball valve 15, a secondary hydrogen pressure reducing valve 16, a third hydrogen supply pipeline ball valve 17, a hydrogen check valve 18, and a hydrogen rail 19; a hydrogen supply pipeline 20 is provided between the hydrogen cylinder group 11 and the hydrogen rail 19, and the hydrogen supply pipeline 20 is successively connected to the hydrogen cylinder group 11, the hydrogen filter 12, the first hydrogen supply pipeline ball valve 13, the primary hydrogen pressure reducing valve 14, the second hydrogen supply pipeline ball valve 15, the secondary hydrogen pressure reducing valve 16, the third hydrogen supply pipeline ball valve 17, the hydrogen check valve 18, and the hydrogen rail 19.

[0030] The hydrogen injection module 2 includes a hydrogen nozzle 21 and a bomb 22. The hydrogen nozzle 21 is connected to the hydrogen rail 19, and the bomb 22 is embedded and connected to one end of the hydrogen nozzle 21 away from the hydrogen rail 19. The embedded hydrogen nozzle 21 can spray gas into the bomb 22 more evenly, thereby improving the efficiency of mixing or cooling. The embedded hydrogen nozzle 21 can control the flow more precisely through the control module 5, thereby optimizing the performance of the entire system.

[0031] The nitrogen supply module 4 includes a nitrogen cylinder group 41 and a nitrogen supply pipeline 42. The nitrogen cylinder group 41 is connected with a first nitrogen supply pipeline ball valve 43 through a nitrogen supply pipeline. One end of the first nitrogen supply pipeline ball valve 43 away from the nitrogen cylinder group 41 is connected with a nitrogen pressure reducing valve 44. One end of the nitrogen pressure reducing valve 44 away from the first nitrogen supply pipeline ball valve 43 is connected with a second nitrogen supply pipeline ball valve 45. One end of the second nitrogen supply pipeline ball valve 45 away from the nitrogen pressure reducing valve 44 is connected with a nitrogen check valve 46.

[0032] The control module 5 includes a data acquisition system 51 and a computer 52. The computer 52 is connected to the output end of the data acquisition system 51. The input end of the data acquisition system 51 is connected with a pressure sensor 53 and a temperature sensor 54. The input end of the temperature sensor 54 is connected to the bomb 22. The input end of the pressure sensor 53 is respectively connected to the hydrogen rail 19, the nitrogen supply pipeline 42 near the hydrogen nozzle 21, and the exhaust pipeline near the bomb 22. The control module 5 is used to adjust the pressure in the hydrogen rail 19, the nitrogen supply pipeline 42, and the exhaust pipeline near the bomb 22 and control the hydrogen nozzle 21. The high-speed camera 37 is connected to the input end of the data acquisition system 51.

[0033] The schlieren system 3 includes: a light source 31, a plane mirror, a concave mirror, a knife edge 36, and a high-speed camera 37; the light source 31 emits light to a first reflector 32, the first reflector 32 refracts the light to a first concave mirror 33 provided at the top of the bomb 22, the first concave mirror 33 provided at the top of the bomb 22 focuses the refracted light to pass through the bomb 22 to a second concave mirror 34 provided at its bottom, the second concave mirror 34 provided at the bottom of the bomb 22 transmits the light to a second reflector 35 near the knife edge 36, the second reflector 35 near the knife edge 36 refracts the light to the knife edge 36 for cutting, and the high-speed camera 37 captures the light after being cut by the knife edge 36. It can convert the density change in the fluid into a visible light intensity change, making the invisible fluid flow visible; it can efficiently observe and analyze the flame shape, flame stability, and the flow of combustion products during the combustion process. Combined with high-speed photography technology, the schlieren system 3 can capture detailed images of high-speed flow events.

[0034] The exhaust module 6 includes a first exhaust pipeline 61, a second exhaust pipeline 62, and a vacuum pump 63. The vacuum pump 63 is provided at one end of the first exhaust pipeline 61. The end of the first exhaust pipeline 61 away from the vacuum pump 63 is connected to the bomb 22. The second exhaust pipeline 62 is connected to the end of the hydrogen track 19. Exhaust pipeline ball valves 64 are provided on both the first exhaust pipeline 61 and the second exhaust pipeline 62. The vacuum pump 63 exhausts the gas in the bomb 22 through the first exhaust pipeline 61, creating a vacuum state inside the bomb 22. The first exhaust pipeline 61 is connected to the bomb 22 and the vacuum pump 63 respectively. The first exhaust pipeline 61 connected to the bomb 22 has a structure of four vertical and one horizontal. One exhaust pipeline ball valve 64 is provided on each of the vertical pipelines of the first exhaust pipeline 61, and three exhaust pipeline ball valves 64 are provided on the horizontal pipeline of the first exhaust pipeline 61, which are respectively provided between the vertical pipelines of the first exhaust pipeline 61.

[0035] Embodiment

[0036] Before the measurement starts, use the nitrogen supply module 4 to purge the pipelines and the bomb 22 of the test device. First, ensure that all the nitrogen supply module 4 and the exhaust module 6 are in the closed state. Input the nitrogen in the nitrogen cylinder group 41 into the nitrogen supply pipeline 42. Open the first nitrogen supply pipeline ball valve 43. After adjusting the nitrogen pressure reducing valve 44 to the required pressure, open the second nitrogen supply pipeline ball valve 45. After passing through the nitrogen one-way valve 46, it enters the bomb 22 through the hydrogen nozzle 21. Then open the exhaust pipeline ball valve 64 on the four vertical pipelines in the four-vertical-and-one-horizontal structure of the first exhaust pipeline 61 and the exhaust pipeline ball valve 64 at the end of the first exhaust pipeline 61. Keep purging with nitrogen for 30 to 60 seconds to discharge the residual gas and air in the device. During the storage and transportation of hydrogen, nitrogen can be used as a protective gas to prevent hydrogen from mixing with oxygen in the air and reduce the risks of explosion and fire. Use nitrogen to fill the device to exclude oxygen and prevent the accidental ignition of hydrogen.

[0037] After the purging is completed, first close the first nitrogen supply pipeline ball valve 43, the second nitrogen supply pipeline ball valve 45, and the exhaust pipeline ball valve 64 at the end of the first exhaust pipeline 61. Then open the exhaust pipeline ball valve 64 near the vacuum pump 63 and start the vacuum pump 63 to discharge the nitrogen and residual air in the device. After the pressure gauge reading in the bomb 22 shows 0 kPa, close the vacuum pump 63 and the exhaust pipeline ball valve 64 near the vacuum pump 63, so that the pressure environment in the bomb 22 is in a vacuum state.

[0038] The hydrogen output from the hydrogen cylinder group 11 is filtered by the hydrogen filter 12. The purpose is to remove impurities to avoid the influence of impurities on the hydrogen combustion efficiency and the corrosion of metal components, and improve the safety during the use of hydrogen. By adjusting the first hydrogen supply pipeline ball valve 13, the second hydrogen supply pipeline ball valve 15, the third hydrogen supply pipeline ball valve 17, the primary hydrogen pressure reducing valve 14, and the secondary hydrogen pressure reducing valve 16 of the hydrogen supply module 1, the primary hydrogen pressure reducing valve 14 and the secondary hydrogen pressure reducing valve 16 can reduce the hydrogen pressure from the storage pressure to the pressure required for the engine to work, avoiding mechanical damage caused by high pressure. The hydrogen pressure reaching the required test pressure in the hydrogen rail 19 transmitted through the hydrogen supply pipeline 20. The second exhaust pipeline 62 set at the end of the hydrogen rail is used to ensure the hydrogen quality entering the hydrogen injection module. Enter the hydrogen injection module 2 to carry out the pressure holding test of the hydrogen nozzle 21. After standing for 20 minutes, read the pressure increase value of the pressure sensor 53 installed on each bomb 22 through the control module 5, and calculate the hydrogen leakage amount during the pressure holding period by using the pressure increase method in comparison with the value of the hydrogen one-way valve 18. If the leakage amount meets the test requirements, then carry out the hydrogen nozzle 21 flow consistency test;

[0039] The hydrogen nozzles 21 installed in the bomb 22 and the hydrogen rail 19 are sprayed intermittently and cyclically according to the ignition sequence of each cylinder of the hydrogen internal combustion engine, and the number of injections, the reading of the bomb 22 pressure sensor 53, the reading of the bomb 22 temperature sensor 54 and the transient value of the pressure sensor 53 on the hydrogen rail 19 are recorded, and then the pressure fluctuation amplitude in the hydrogen rail 19 is obtained to verify whether the design of the hydrogen rail 19 meets the flow demand of the hydrogen internal combustion engine. The flow rate of each nozzle is calculated by the rising value of the bomb 22 pressure sensor 53 to check the flow consistency of the nozzle;

[0040] Check that all equipment in the Schlieren system 3 is in good condition, and ensure that the laboratory environment is stable to reduce vibration and airflow interference. Adjust the light path, adjust the light source 31 and the first reflector 32 to make the light pass through the experimental area in parallel, and adjust the first concave mirror 33 and the second concave mirror 34 to ensure a clear image of the injection area. The positions of the second reflector 35 and the blade 36 are adjusted, and the blade 36 is placed on the focal plane so that the density gradient change in the injection area can be detected by the change of light intensity. The high-speed camera 37 is started. Before the formal image acquisition, the position of the blade 36 needs to be fine-tuned. The image captured by the high-speed camera is pre-processed by the data acquisition system 51 and the computer 52, including graying, noise reduction, cropping, and rotation, to obtain the clearest density gradient image. The Schlieren system 3 can detect slight changes in density in the medium. Density changes are usually related to temperature, pressure or composition changes. The light and dark contrast in the Schlieren image reflects these changes. The control module 5 realizes the coordinated control of hydrogen injection and the high-speed camera, which can capture the instantaneous image of high-speed flow and shoot the jet morphology of hydrogen when the hydrogen nozzle 21 in each container 22 is turned on. The jet cone angle and jet penetration distance of each nozzle under different injection back pressures are obtained by calculating the Schlieren image to further verify the consistency of the hydrogen nozzle 21.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. A hydrogen nozzle flow consistency measurement device for a hydrogen internal combustion engine, characterized in that: Including: hydrogen supply module, hydrogen injection module, schlieren system, nitrogen supply module, control module and exhaust module; The output ends of the hydrogen supply module and the nitrogen supply module are connected to the input end of the hydrogen injection module, the output end of the hydrogen injection module is connected to the input end of the exhaust module, the schlieren system is arranged in the hydrogen injection module, and the hydrogen supply module, the hydrogen injection module and the nitrogen supply module are all connected to the control module.

2. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 1, characterized in that: The hydrogen supply module includes a hydrogen cylinder group, a hydrogen filter, a first hydrogen supply pipeline ball valve, a first hydrogen pressure reducing valve, a second hydrogen supply pipeline ball valve, a second hydrogen pressure reducing valve, a third hydrogen supply pipeline ball valve, a hydrogen check valve, and a hydrogen track; A hydrogen supply pipeline is arranged between the hydrogen cylinder group and the hydrogen track, and the hydrogen supply pipeline is sequentially connected to the hydrogen cylinder group, a hydrogen filter, a first hydrogen supply pipeline ball valve, a first-level hydrogen pressure reducing valve, a second hydrogen supply pipeline ball valve, a second-level hydrogen pressure reducing valve, a third hydrogen supply pipeline ball valve, a hydrogen check valve and a hydrogen track.

3. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 2, characterized in that: The hydrogen injection module comprises a hydrogen nozzle and a bomb, wherein the hydrogen nozzle is connected to the hydrogen track, and the bomb is embeddedly connected to an end of the hydrogen nozzle away from the hydrogen track.

4. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 3, characterized in that: The schlieren system includes a light source, a plane mirror, a concave mirror, a knife edge, and a high-speed camera; The light source emits light to a first reflector, the first reflector refracts the light to a first concave mirror arranged at the top of the bomb, the first concave mirror arranged at the top of the bomb gathers the refracted light through the bomb to a second concave mirror arranged at the bottom thereof, the second concave mirror arranged at the bottom of the bomb transmits the light to a second reflector close to the blade, the second reflector close to the blade refracts the light to the blade for cutting, and the high-speed camera captures the light after the blade is cut.

5. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 4, characterized in that: The nitrogen supply module includes a nitrogen cylinder group and a nitrogen supply pipeline, the nitrogen cylinder group is connected to a first nitrogen supply pipeline ball valve through the nitrogen supply pipeline, the end of the first nitrogen supply pipeline ball valve away from the nitrogen cylinder group is connected to a nitrogen pressure reducing valve, the end of the nitrogen pressure reducing valve away from the first nitrogen supply pipeline ball valve is connected to a second nitrogen supply pipeline ball valve, and the end of the second nitrogen supply pipeline ball valve away from the nitrogen pressure reducing valve is connected to a nitrogen check valve.

6. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 5, characterized in that: The exhaust module includes a first exhaust pipeline, a second exhaust pipeline and a vacuum pump. The vacuum pump is arranged at one end of the first exhaust pipeline. The end of the first exhaust pipeline away from the vacuum pump is connected to the bomb container. The second exhaust pipeline is connected to the end of the hydrogen track. Exhaust pipeline ball valves are provided on the first exhaust pipeline and the second exhaust pipeline.

7. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 6, characterized in that: The vacuum pump exhausts the gas in the bomb container through the first exhaust pipeline, so that a vacuum state is formed inside the bomb container.

8. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 7, characterized in that: The control module includes a data acquisition system and a computer, the computer is connected to the output end of the data acquisition system, the input end of the data acquisition system is connected to a pressure sensor and a temperature sensor, the input end of the temperature sensor is connected to the container bomb, and the input end of the pressure sensor is respectively connected to the hydrogen track, the nitrogen supply pipeline close to the hydrogen nozzle, and the exhaust pipeline close to the container bomb.

9. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 8, characterized in that: The control module is used to adjust the pressure in the hydrogen rail, the nitrogen supply pipeline and the exhaust pipeline close to the bomb container and to control the hydrogen nozzle.

10. The device for measuring the flow consistency of a hydrogen nozzle of a hydrogen internal combustion engine according to claim 8, characterized in that: The high-speed camera is connected to the input end of the data acquisition system.

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