Hydrogen-oxygen-water vapor micro-mixing high-pressure combustion testing device

Abstract

The invention discloses a hydrogen-oxygen-water vapor micro-mixing high-pressure combustion testing device, and belongs to the field of hydrogen-oxygen combustion. The device comprises a filler, a water vapor pipeline, a combustor and a spark plug. According to the invention, the design of regenerative cooling and choking flow is adopted, liquid water is used as a coolant, water vapor obtained after gasification of the liquid water is used as a working medium, and the test requirements of combustion stability and combustion efficiency of different micro-mixing structure single-nozzle combustors under a high-pressure condition are met. According to the invention, the following technical problems can be solved: (1) high-temperature ablation of the wall surface under the conditions of high combustion rate and high heat release rate of pure hydrogen and pure oxygen combustion is solved through water / water vapor regeneration cooling; (2) aiming at a hydrogen-oxygen-water vapor working medium, adopting a shrinkage profile combustion chamber design, forming choked flow through critical section shrinkage, and simulating a high-pressure operation environment in an actual industrial gas turbine combustion chamber under a laboratory scale; and (3) constructing design criteria of related sizes of the testing device, and establishing a combustion stability and combustion efficiency evaluation method based on combustion chamber pressure.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of hydrogen-oxygen combustion, and relates to a design criterion and a use method of a hydrogen-oxygen-steam high-pressure micro-mixing combustion test device. BACKGROUND

[0002] Hydrogen has become one of the most potential fuels for aviation engines, ground gas turbines and industrial boilers due to its zero carbon emission and renewable characteristics. In addition, using oxygen-enriched or pure oxygen as an oxidant in industrial production or renewable energy electrolysis can fundamentally avoid the generation of nitrogen oxides and further promote energy saving and emission reduction. However, hydrogen has a high burning rate, is easy to backfire, and high flame temperature increases the risk of ablation, which becomes more serious under pure oxygen conditions. Although micro-mixing combustion technology can effectively reduce the backfire risk, the flame temperature and heat release rate under pure hydrogen and pure oxygen conditions are much higher than those of hydrogen-air flames, and even in the micro-scale range, mixing combustion is also easy to ablate the wall surface of the combustion chamber, which brings great challenges to the safety of the combustion chamber. Water has a wide range of sources and low price, and the use of vaporized water vapor for dilution of the combustion chamber not only increases the specific heat capacity and reduces the oxygen concentration of the mixture, but also can regulate the flame temperature, which can significantly reduce the ablation risk.

[0003] Current research on hydrogen-oxygen-steam micro-mixing combustion technology mainly focuses on atmospheric combustion chambers, and the combustion efficiency is evaluated by quantifying the residual hydrogen and oxygen in the exhaust gas. However, there is still a significant gap in the current academic research on hydrogen-oxygen-steam combustion technology under high pressure conditions. In addition, the combustion exhaust gas is mainly composed of pure steam, with very low concentrations of hydrogen and oxygen, which brings major challenges to the reliable sampling and drying process required for gas analysis, making the accurate determination of combustion efficiency complex. Finally, industrial gas turbine combustion chambers usually use high-pressure combustion, and the pressure may exceed 1 MPa. Ordinary micro-mixing nozzles are difficult to achieve high-pressure hydrogen-oxygen combustion testing in atmospheric environment, while micro-mixing combustors with contraction profiles designed under choked flow constraints can meet the needs of hydrogen-oxygen high-pressure combustion testing. Therefore, it is of great engineering application value to establish a rapid test system for hydrogen-oxygen-steam single-nozzle combustors. SUMMARY

[0004] In order to solve the problem of hydrogen-oxygen-water vapor high-pressure micro-mixed combustion test, the main purpose of the present application is to provide a hydrogen-oxygen-water vapor micro-mixed high-pressure combustion test device, which adopts regenerative cooling and choke flow design, uses liquid water as coolant, and uses water vapor after water vaporization as working medium, so as to meet the combustion stability and combustion efficiency test requirements of different micro-mixed structure single nozzle burners under high pressure conditions. The present application can solve the following technical problems: ① solve the high temperature ablation of the wall under the condition of high burning speed and high heat release rate of pure hydrogen and pure oxygen combustion by water / water vapor regenerative cooling; ② for hydrogen-oxygen-water vapor working medium, adopt the design of contraction surface of the combustion chamber, form choke flow through the contraction of the critical section, and simulate the high pressure operation environment in the actual industrial gas turbine combustion chamber under the laboratory scale; ③ establish the design criteria of the related size of the test device, and establish the combustion stability and combustion efficiency evaluation method based on the pressure of the combustion chamber.

[0005] The purpose of the present application is realized by the following technical solutions.

[0006] The hydrogen-oxygen-water vapor micro-mixed high-pressure combustion test device disclosed by the present application comprises a filler, a water vapor pipeline, a burner and a spark plug.

[0007] The filler and the burner are fixedly connected, the burner injects the water vapor after vaporization into the filler through the water vapor pipeline, the spark plug is installed on the outer side wall of the burner and is used for ignition during the test, and the filler comprises a hydrogen inlet, a water vapor inlet, an oxygen inlet, a front annular cavity and a rear annular cavity.

[0008] The hydrogen inlet and the oxygen inlet are arranged on the side wall of the filler, the water vapor inlet is arranged on the front middle part of the filler, the front annular cavity and the rear annular cavity are arranged in the filler, the front annular cavity is used to inject hydrogen into the water vapor inlet together with the hydrogen inlet and the water vapor inlet, and the rear annular cavity is used to inject oxygen into the water vapor inlet together with the oxygen inlet and the water vapor inlet.

[0009] The burner comprises a liquid water inlet, a combustion chamber inlet, a combustion chamber contraction section, a combustion chamber outlet, a burner outer cladding layer outlet and a burner outer cladding layer, the combustion chamber inlet of the burner is connected with the filler, a plurality of liquid water inlets are arranged on the side wall of the burner, the burner has a double-layer structure, the inner layer is the combustion chamber contraction section, and the outer layer is the burner outer cladding layer, the combustion chamber contraction section has a gradually contracting structure, and the gas is discharged through the combustion chamber outlet, the burner outer cladding layer has an annular cavity structure around the combustion chamber contraction section, and the burner outer cladding layer outlet is communicated with the water vapor pipeline.

[0010] Further, the outer side wall of the filler is provided with filler fins, a plurality of filler assembly holes are processed on the filler fins, and screws pass through the filler assembly holes to fixedly connect the filler and the burner.

[0011] Further, a pressure sensor interface is arranged on the burner and communicates with a pressure measuring point in the combustion chamber, for measuring the pressure inside the burner.

[0012] Further, wall temperature measuring points T1, T2, T3 and T4 are further included, which are arranged on the burner, the water vapor pipeline and the filler respectively, for measuring the temperature of the burner wall, the middle wall of the water vapor pipeline and the inlet wall of the filler.

[0013] Further, the burner screw fitting hole is located at the end of the burner, and the filler and the burner are connected by a screw.

[0014] Further, the diameter d of the combustion chamber outlet is obtained by the following method: d = 4P / (πT i P represents the pressure in the combustion chamber, m represents the mass flow rate of the incoming flow, R represents the gas constant, T i T represents the temperature in the combustion chamber, k represents the specific heat ratio

[0015]

[0016] In the method for performing the combustion test by using the hydrogen-oxygen-water vapor micro-mixing high-pressure combustion test device, hydrogen is introduced from the hydrogen inlet into the front annular cavity of the filler, and introduced into the water vapor inlet located in the central axial channel of the filler; oxygen is introduced from the oxygen inlet into the rear annular cavity of the filler, and introduced into the water vapor inlet located in the central axial channel of the filler; liquid water is introduced from the liquid water inlet into the outer cladding layer of the burner, and then heated and vaporized into water vapor from the outlet of the outer cladding layer of the burner, and then introduced into the water vapor inlet of the filler through the water vapor pipeline; water vapor, hydrogen and oxygen are introduced from the central axial channel of the filler into the inlet of the combustion chamber, and then into the combustion chamber, at this time the spark plug is ignited, the mixed gas is accelerated and pressurized through the contraction section of the combustion chamber, and then sprayed out of the outlet of the combustion chamber.

[0017] The performance evaluation method of the hydrogen-oxygen-water vapor micro-mixing high-pressure combustion test device is evaluated by the combustion efficiency η; during the test, the combustion temperature is calculated by the enthalpy change of the chemical reaction, the latent heat of evaporation of liquid water, the heat loss of the test device and the heat absorption of the test device; the enthalpy change and temperature rise in the reaction process are calculated according to the amount of reactants, the latent heat property parameter of liquid water is fixed, and the heat required for the gasification of liquid water can be obtained by multiplying the flow of liquid water; the heat loss of the test device is mainly the convective heat transfer to the atmosphere, and the heat absorption is the heat absorbed by measuring the temperature rise of the test device, and the heat loss and heat absorption are calculated by the heat transfer coefficient and the specific heat capacity respectively; during the calculation of the heat loss and heat absorption, the measurement data of the four wall temperature measuring points are used to evaluate the temperature rise of the test device, and the data support is provided for the calculation; the temperature T in the combustion chamber is calculated i Then, the theoretical pressure P i And the test pressure The combustion efficiency η is calculated:

[0018]

[0019] Beneficial effects:

[0020] 1. The hydrogen-oxygen-water vapor micro-mixing high-pressure combustion test device disclosed by the application has a segmented annular cavity inside the filler, so that hydrogen and oxygen are introduced into the combustion chamber from different inlets, avoiding the risk of backfire to the incoming pipeline.

[0021] 2. The hydrogen-oxygen-water vapor micro-mixing high-pressure combustion test device disclosed by the application uses regenerative cooling technology to regulate the combustion process, reducing the risk of combustion chamber wall ablation, and the water vapor after gasification can also dilute the hydrogen-oxygen flame to control the flame temperature and reaction heat release rate, solving the problem of high-temperature ablation of hydrogen-oxygen flame; in addition, compared with nitrogen or carbon dioxide dilution, water vapor itself has zero carbon and zero nitrogen emission, and the addition of water vapor also increases the work capacity of the burner, achieving clean combustion and improving the power of the combustion chamber; further, the source of the dilution water vapor is the liquid water as the coolant, which absorbs the heat of the combustion chamber wall, not only protecting the combustion chamber wall from high-temperature ablation, but also absorbing heat to gasify water vapor for diluting the flame, compared with other types of cooling methods such as ablation cooling and gas film cooling, the regenerative cooling method can also reduce the energy consumption of additional gasification of liquid water into water vapor.

[0022] 3. The hydrogen-oxygen-steam micro-mixing high-pressure combustion test device disclosed in the application adopts the design concept of a contraction surface combustion chamber under choked flow constraints, forms choked flow through critical section contraction, realizes acceleration and pressure rise of the mixed gas, enhances turbulent mixing efficiency and establishes a high-pressure combustion environment, realizes simulation of the high-pressure operating environment in the industrial gas turbine combustion chamber under laboratory scale, and meets the combustion stability and combustion efficiency test requirements of different micro-mixing structure single-nozzle burners under high-pressure conditions. In the aspect of establishing a high-pressure environment, compared with a high-pressure bin, the combustion chamber structure designed by choked flow is simple, does not need to establish an additional high-pressure environment, is low in cost, and is easy to iterate.

[0023] 4. The hydrogen-oxygen-steam micro-mixing high-pressure combustion test device disclosed in the application establishes a combustion stability and combustion efficiency evaluation method based on the combustion chamber pressure by constructing the design criteria of the related dimensions of the test device and combining thermodynamic and fluid mechanics calculations, and avoids the difficulties faced by gas analysis sampling and drying in the combustion tail gas method. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole schematic diagram of the combustion test device, in which the filler is on the left and the burner is on the right;

[0025] Figure 2 It is a left view of the combustion device;

[0026] Figure 3 It is a right view of the combustion device;

[0027] Figure 4 It is an isometric view of the filler;

[0028] Figure 5 It is a left view of the filler and a sectional view along the hydrogen-oxygen inlet;

[0029] Figure 6 It is an isometric view of the burner;

[0030] Figure 7 It is a right view of the burner, a sectional view along the liquid water inlet;

[0031] Figure 8 It is a sectional view of the combustion test device along the liquid water inlet and the steam pipeline;

[0032] Figure 9 It is a timing diagram in the specific implementation mode;

[0033] Figure 10 It is a graph of the expected ideal pressure curve of the implementation working condition;

[0034] Wherein, 1-screw, 2-filler, 3-water vapor pipeline, 4-burner, 5-spark plug, 6-filler rib, 7-filler assembly hole, 8-hydrogen inlet, 9-water vapor inlet (filler central axial passage), 10-oxygen inlet, 11-front section annular cavity (filler), 12-rear section annular cavity (filler), 13-burner assembly threaded hole, 14-pressure sensor interface, 15-spark plug interface, 16-liquid water inlet, 17-combustion chamber inlet (matching filler), 18-combustion chamber contraction section, 19-combustion chamber outlet, 20-burner outer cladding outlet, 21-burner outer cladding, 22-wall surface temperature measuring point T1, 23-wall surface temperature measuring point T2, 24-wall surface temperature measuring point T3, 25-wall surface temperature measuring point T4, 26-combustion chamber internal pressure measuring point. DETAILED DESCRIPTION

[0035] The application is further illustrated by examples and drawings.

[0036] The outlet aperture d of the combustion chamber is calculated by the following formula: wherein P i represents the pressure in the combustion chamber, represents the mass flow rate of the incoming flow, R represents the gas constant, T i represents the temperature in the combustion chamber, k represents the specific heat ratio

[0037]

[0038] Taking a specific working condition as an example, it is assumed that the hydrogen flow rate is 48 liters per minute, the oxygen flow rate is 30 liters per minute, the liquid water flow rate is 0.75 grams per second, and the temperature in the combustion chamber is about 2200 Kelvin. In order to achieve stable combustion at a pressure of about 1 MPa in the combustion chamber, the design range of the outlet aperture d of the combustion chamber should be kept at 1.7 ± 0.2 millimeters.

[0039] As shown in Figure 1 , 2 and 3, the hydrogen-oxygen-water vapor micro-mixing high-pressure combustion test device disclosed in the embodiment comprises a filler 2, a water vapor pipeline 3, a burner 4, and a spark plug 5. The filler 2 and the burner 4 are fixedly connected, and the burner 4 injects the gasified water vapor into the filler 2 through the water vapor pipeline 3. The spark plug 5 is installed at the spark plug interface 15 of the outer wall of the burner 4, and is used for ignition during the test.

[0040] As shown in Figure 4 and 5As shown, the injector 2 includes a hydrogen inlet 8, a water vapor inlet 9, an oxygen inlet 10, a front annular cavity 11, and a rear annular cavity 12. The sidewalls of the injector 2 have the hydrogen inlet 8 and the oxygen inlet 10. The water vapor inlet 9 is located in the middle of the front of the injector 2. The interior of the injector 2 has the front annular cavity 11 and the rear annular cavity 12. The front annular cavity 11 is used to inject hydrogen into the water vapor inlet 9, along with the hydrogen inlet 8. The rear annular cavity 12 is used to inject oxygen into the water vapor inlet 9, along with the oxygen inlet 10. The outer sidewall of the injector 2 has injector ribs 6, and multiple injector mounting holes 7 are machined on the injector ribs 6. Screws 1 pass through the injector mounting holes 7 to fix the injector 2 and the burner 4 together.

[0041] like Figure 6 , 7 As shown in Figure 8, the burner threaded mounting hole 13 is located at the end of the burner 4, and the injector 2 and the burner 4 are connected by screw 1; the burner 4 includes a liquid water inlet 16, a combustion chamber inlet 17, a combustion chamber contraction section 18, a combustion chamber outlet 19, a burner outer jacket outlet 20, and a burner outer jacket 21; the combustion chamber inlet 17 of the burner 4 is connected to the injector 2; multiple liquid water inlets 16 are provided on the side wall of the burner 4; the burner 4 has a double-layer structure, with the inner layer being the combustion chamber contraction section 18 and the outer layer being the burner outer jacket 21; the combustion chamber contraction section 18 has a gradually contracting structure, and the gas is discharged through the combustion chamber outlet 19. The outer jacket 21 of the burner is an annular cavity structure surrounding the constriction section 18 of the combustion chamber, and is connected to the steam pipe 3 through the outlet 20 of the outer jacket of the burner; a pressure sensor interface 14 is also arranged on the burner 4 and is connected to the pressure measuring point 26 in the combustion chamber for measuring the internal pressure of the burner; wall temperature measuring points T1 (22), T2 (23), T3 (24) and T4 (25) are respectively arranged on the burner 4, the steam pipe 3 and the injector 2 for measuring the temperature of the wall of the burner 4, the middle wall of the steam pipe 3 and the inlet wall of the injector 2;

[0042] The working process of the combustion test device is as follows: hydrogen is introduced from the hydrogen inlet 8 into the front annular cavity 11 of the filler 2, and the water vapor inlet (the central axial channel of the filler) 9; oxygen is introduced from the oxygen inlet 10 into the rear annular cavity 12 of the filler 2, and the water vapor inlet (the central axial channel of the filler) 9; liquid water is introduced from the liquid water inlet 16 into the outer cladding layer 21 of the burner, and then is heated and vaporized into water vapor from the burner outer cladding layer outlet 20, and then enters the water vapor inlet (the central axial channel of the filler) 9 of the filler 2 through the water vapor pipeline 3; the water vapor, hydrogen and oxygen are introduced from the water vapor inlet (the central axial channel of the filler) 9 into the combustion chamber inlet 17, and then enter the combustion chamber, at this time the spark plug 5 is ignited, the mixed gas is accelerated and pressurized through the contraction section 18 of the combustion chamber, and finally is sprayed out of the combustion chamber outlet 19.

[0043] Figure 5 As described in the above, the inlet holes of the hydrogen and oxygen inlet annular cavities at the central channel are perpendicular to the central channel, so that the mixing mode of the water vapor and hydrogen and oxygen is cross jet. It is worth emphasizing that the filler is modularly replaced, and different filler inlet structures are designed for different unit nozzle configurations, such as swirl, bluff body, etc., so as to meet the test requirements of different structure nozzles.

[0044] Taking an ideal test working condition as an example, hydrogen, oxygen and liquid water are introduced into the test device, and the test test sequence is as shown in the following table: Figure 9 First, oxygen is introduced at 0.5s, and after 1s, the spark plug 5 starts to work to generate an electric spark. The hydrogen is introduced after the spark plug is started for 0.5s, and the liquid water is introduced after the hydrogen is introduced for 5s. The oxygen is introduced for 53.5s, the electric spark generated by the spark plug 5 works for 3.5s, the hydrogen is introduced for 50s, and the liquid water is introduced for 52s. The pressure collection is turned on throughout the whole process, and the duration is 59.5s.

[0045] Figure 10The expected ideal curve of the combustor pressure changing with time under the example working condition is shown. The change rule of the pressure curve can be divided into three rising sections, two falling sections, and two stable sections, a total of seven stages. It is worth noting that the actual test pressure curve is disturbed, and each stage is smoothly transitioned. If the root mean square disturbance value of the pressure during the test is less than 0.01 MPa, it can be considered that the hydrogen-oxygen water vapor is stably combusted in the combustor. In stages s1 and s2, the pressure in the combustor reaches a first peak value and decreases rapidly at the moment of oxygen injection; in stage s3, the combustor pressure increases sharply as the hydrogen and oxygen are ignited by the spark generated by the spark plug 5 and the arrival of the hydrogen injection timing; in stage s4, the hydrogen-oxygen is stably combusted, and the pressure reaches a first plateau; in stage s5, after the liquid water is injected into the outer interlayer 21 of the combustor, it is cooled on the wall surface and itself is vaporized into water vapor by being heated, and then it is injected into the combustor through the water vapor pipeline 3 and the filler 2, causing the inflow flow in the combustor to increase sharply, resulting in a sharp increase in the combustor pressure; in stage s6, after the hydrogen-oxygen combustion heat release, the water cooling, and the water vapor dilution reach a balance, the combustor pressure gradually stabilizes, reaching a second pressure plateau, and the hydrogen-oxygen water vapor is stably combusted in the combustor; in stage s7, the hydrogen injection stops, the combustor is extinguished, the pressure drops sharply, and the test is completed.

[0046] Under the example working condition, four patch-type thermocouples monitor the wall surface temperature in real time, wherein the wall surface temperature measuring point T1 (22) is located at the rightmost end of the combustor 4 in the axial direction and directly above the combustor outer interlayer outlet 20 in the circumferential direction; the wall surface temperature measuring point T2 (23) is located at the rightmost end of the combustor 4 in the axial direction and directly below the combustor outer interlayer outlet 20 in the circumferential direction; the wall surface temperature measuring point T3 (24) is located in the middle of the water vapor pipeline 3; and the wall surface temperature measuring point T4 (25) is located at the connection between the water vapor pipeline 3 and the filler 2. Through the measurement of the wall surface temperature, the temperature change data of the combustion test device can be obtained.

[0047] The performance evaluation method of the combustion test device is as follows: during the test, the combustion temperature can be calculated by the enthalpy change of the chemical reaction, the latent heat of evaporation of liquid water, the heat loss of the test device, and the heat absorption of the test device. Specifically, the enthalpy change calculation process of the chemical reaction includes looking up the thermodynamic property parameters of hydrogen, oxygen, and water vapor at different temperatures, and calculating the enthalpy change and temperature rise in the reaction process according to the amount of reactants; the latent heat of evaporation of liquid water is fixed, and can be multiplied by different flow rates; the heat loss of the test device is mainly the convective heat transfer to the atmosphere, and the heat absorption is the heat absorbed by measuring the temperature rise of the test device; the heat loss and heat absorption can be calculated by the heat transfer coefficient and the specific heat capacity, respectively; during the calculation of the heat loss and heat absorption, the measurement data of the four wall surface temperature measuring points can be used to evaluate the temperature rise of the test device, providing data support for the calculation. The temperature T in the combustor is calculated asi After that, according to the theoretical pressure P i And the test pressure The combustion efficiency η

[0048]

[0049] According to the above embodiment, the application combines regenerative cooling technology, uses liquid water to cool the combustion chamber wall surface, and uses water vapor to dilute the flame, which can greatly reduce the temperature in the combustion chamber, solve the high-temperature ablation problem of the wall surface under the condition of pure hydrogen and pure oxygen combustion with high burning speed and high heat release rate; the internal structure design of the combustion chamber with a contraction surface under the constraint of choked flow can simulate the high-pressure operating environment in the industrial gas turbine combustion chamber at the laboratory scale, and realize the high-pressure stable combustion of hydrogen-oxygen-water vapor; finally, through thermodynamic and fluid dynamics calculation means, a high-precision combustion efficiency evaluation method based on combustion pressure is established.

[0050] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A hydrogen-oxygen-water vapor micro-mixing high-pressure combustion testing device, characterized in that: Includes injector, steam pipe, burner, and spark plug; The injector and the burner are fixedly connected. The burner injects vaporized water vapor into the injector through a steam pipe. The spark plug is installed on the outer wall of the burner for ignition during the test. The dispenser includes a hydrogen inlet, a water vapor inlet, an oxygen inlet, a front annular cavity, and a rear annular cavity; the side walls of the dispenser have hydrogen and oxygen inlets; the middle part at the front of the dispenser has a water vapor inlet; the interior of the dispenser has a front annular cavity and a rear annular cavity. The front annular cavity is used to connect the hydrogen inlet and the water vapor inlet, and to inject hydrogen into the water vapor inlet; The rear annular cavity is used to connect the oxygen inlet and the water vapor inlet, injecting oxygen into the water vapor inlet; The burner includes: a liquid water inlet, a combustion chamber inlet, a combustion chamber contraction section, a combustion chamber outlet, a burner outer jacket outlet, and a burner outer jacket; the combustion chamber inlet is connected to the injector; multiple liquid water inlets are provided on the side wall of the burner; the burner has a double-layer structure, with the inner layer being the combustion chamber contraction section and the outer layer being the burner outer jacket; the combustion chamber contraction section has a gradually contracting structure, and the gas is discharged through the combustion chamber outlet; the burner outer jacket is an annular cavity structure surrounding the combustion chamber contraction section and is connected to a steam pipe through the burner outer jacket outlet.

2. The hydrogen-oxygen-water vapor micro-mixing high-pressure combustion testing device as described in claim 1, characterized in that: The outer wall of the injector has injector ribs, and multiple injector mounting holes are machined on the injector ribs. Screws pass through the injector mounting holes to fix the injector and the burner together.

3. The hydrogen-oxygen-water vapor micro-mixing high-pressure combustion test device as described in claim 1, characterized in that: The burner is also equipped with a pressure sensor interface, which is connected to the pressure measuring point in the combustion chamber to measure the internal pressure of the burner.

4. The hydrogen-oxygen-water vapor micro-mixing high-pressure combustion testing device as described in claim 1, characterized in that: It also includes wall temperature measuring points T1, T2, T3, and T4; which are respectively arranged on the burner, steam pipe, and injector to measure the temperature of the burner wall, the middle wall of the steam pipe, and the inlet wall of the injector.

5. The hydrogen-oxygen-water vapor micro-mixing high-pressure combustion test device as described in claim 1, characterized in that: The burner threaded mounting hole is located at the end of the burner, and the injector and burner are connected by screws.

6. The hydrogen-oxygen-water vapor micro-mixing high-pressure combustion test device as described in claim 1, characterized in that: The diameter d of the combustion chamber outlet is obtained by the following method: where P i Indicates the pressure inside the combustion chamber. R represents the incoming mass flow rate, and T represents the gas constant. i The temperature inside the combustion chamber is represented by k, and the specific heat ratio is represented by k.

7. A method for conducting a combustion test using the apparatus described in claim 1, 2, 3, 4, 5, or 6, characterized in that: Hydrogen gas enters through the hydrogen inlet and flows into the front annular cavity of the injector, then into the water vapor inlet located in the central axial channel of the injector. Oxygen gas enters through the oxygen inlet and flows into the rear annular cavity of the injector, then into the water vapor inlet located in the central axial channel of the injector. Liquid water enters through the liquid water inlet and flows into the outer jacket of the burner, where it is heated and vaporized into water vapor, which flows out from the outer jacket outlet and through the water vapor pipe into the water vapor inlet of the injector. Water vapor, hydrogen, and oxygen enter the combustion chamber through the central axial channel of the injector, where the spark plug ignites the mixture. The mixture is accelerated and pressurized in the constriction section of the combustion chamber and then ejected from the combustion chamber outlet.

8. A method for performance evaluation of the apparatus as described in claim 1, 2, 3, 4, 5, or 6, characterized in that: The performance of the device is evaluated using the combustion efficiency η. During the experiment, the combustion temperature is calculated using the enthalpy change of the chemical reaction, the latent heat of vaporization of liquid water, the heat loss of the test device, and the heat absorption of the test device. The calculation of the enthalpy change of the chemical reaction involves consulting the thermodynamic properties of hydrogen, oxygen, and water vapor at different temperatures, and calculating the enthalpy change and temperature rise during the reaction process based on the amount of reactants. The latent heat of vaporization of liquid water is a fixed property; multiplying it by the flow rate of liquid water yields the heat required for vaporization. The heat loss of the test device is mainly convective heat transfer to the atmosphere, while the heat absorption is the heat absorbed by measuring the temperature rise of the test device. Heat loss and heat absorption are calculated using the heat transfer coefficient and specific heat capacity, respectively. During the calculation of heat loss and heat absorption, the measurement data from four wall temperature measurement points are used to evaluate the temperature rise of the test device and provide data support for the calculation. support; The temperature T inside the combustion chamber was calculated. i Then, based on the theoretical pressure P in the combustion chamber i and test pressure The combustion efficiency η is calculated as follows:

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