A hydrogen-oxygen combustion heater applied to a pulse combustion wind tunnel with high temperature air inflow

Abstract

The application belongs to the technical field of pulse combustion wind tunnel test, and discloses a hydrogen-oxygen combustion heater applied to a high-temperature air inflow pulse combustion wind tunnel. The hydrogen-oxygen combustion heater of the pulse combustion wind tunnel comprises, from front to back, a high-temperature flow-limiting throat, a mixing section, an injector, a combustion chamber and a nozzle; the high-temperature flow-limiting throat comprises, in sequence, a contraction section, a throat section and an expansion section, the expansion section is provided with an oxygen gas collecting cavity and a plurality of oxygen gas injection holes; the injector is composed of an injection unit, a front cover plate and a rear cover plate; a plurality of injection units distributed in a central symmetry mode penetrate the front cover plate and the rear cover plate from front to back; the cavity surrounded by the front cover plate, the rear cover plate and the injection unit is a hydrogen gas collecting cavity; the inner cavity channel of the injection unit is first contracted and then expanded, and the expansion section is provided with a plurality of hydrogen gas injection holes distributed uniformly in a circumferential direction. The effective mixing of high-temperature air, hydrogen and oxygen is realized, self-ignition is achieved, and high-temperature and high-pressure gas generated thereby is used to carry out wind tunnel test of air-breathing hypersonic aircraft.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pulse combustion wind tunnel test, and particularly relates to a hydrogen-oxygen combustion heater applied to a high-temperature air inflow of a pulse combustion wind tunnel. BACKGROUND

[0002] Air-breathing hypersonic vehicles directly draw oxygen from the atmosphere without carrying oxidizers, reducing transportation costs, increasing payload capacity, and being suitable for long-term flight in the atmosphere. Scramjet engine, airframe and propulsion integration are two core technologies for the development of air-breathing hypersonic vehicles. Numerical simulation, ground test and flight test are the main means for key technology research. Ground test can directly obtain the performance data of the vehicle, and is the most important means for the research of air-breathing hypersonic vehicles. Ground simulation equipment that can simulate the real flight environment (total enthalpy, total pressure, Mach number, etc.) of the vehicle is needed for ground test. Due to the high flight Mach number of air-breathing hypersonic vehicles, the total enthalpy and total pressure of the inflow are also very high, and heating methods need to be used to generate high-temperature and high-pressure gas to simulate flight conditions. According to the heating method, the heater of the ground simulation equipment can be divided into: combustion heating, shock wave heating, arc heating, adiabatic compression and multi-stage compression heating, heat storage heating, resistance online direct heating, etc.

[0003] Pulse combustion wind tunnel is a device applied to the ground test of scramjet engine, which generates high-temperature and high-pressure combustion gas through combustion heating, and the test inflow gas simulating the flight conditions of scramjet engine is generated through the expansion and acceleration of Laval nozzle. The pulse combustion wind tunnel has a short running time, usually within 1 second. Pulse combustion wind tunnel is widely used in scramjet engine ground test, and has the advantages of low investment, small technical risk, low running cost and wide running range. The combustion temperature of hydrogen-oxygen combustion heater is high, which can simulate higher flight Mach number, and it is widely used in pulse combustion wind tunnel and is an important part of pulse combustion wind tunnel. The hydrogen-oxygen combustion heater of pulse combustion wind tunnel uses hydrogen as fuel, and high-temperature and high-pressure combustion gas is generated by burning hydrogen and oxygen or oxygen-rich air.

[0004] With the increase of the simulated Mach number of the ground simulation equipment, the simulated temperature also increases, and the content of the pollution components in the combustion products increases linearly. For the hydrogen-oxygen combustion heater, when the simulated Mach number is 5, the test gas flow with a water mole fraction of 13% will be generated, and when the simulated Mach number is 9, the water mole fraction in the test gas flow is as high as 40%. At this time, the water component in the test gas flow does not exist in the real flight conditions, which will have a great impact on the chemical reaction in the engine test process, not only causing the test obtained combustion chamber heat release rate to be smaller than that under the real flight conditions, but also reducing the heat released by the engine combustion.

[0005] In order to solve the problem, a two-stage heating mode of "heat accumulation + combustion" can be used, that is, the air is heated to a certain temperature by the heat accumulation heater, and then mixed and combusted with hydrogen, which can not only realize self-ignition of the hydrogen-oxygen combustion heater, simplify the complexity of the structure, but also greatly reduce the water component content in the test airflow and improve the accuracy of the ground test simulation.

[0006] Currently, it is urgent to develop a hydrogen-oxygen combustion heater applied to a pulse combustion wind tunnel with high-temperature air inflow. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a hydrogen-oxygen combustion heater applied to a pulse combustion wind tunnel with high-temperature air inflow.

[0008] The hydrogen-oxygen combustion heater applied to the pulse combustion wind tunnel with high-temperature air inflow comprises, from front to back, a high-temperature flow-limiting throat, a mixing section, an injector, a combustion chamber and a nozzle in sequence.

[0009] The high-temperature flow-limiting throat comprises, from front to back, a contraction section, a throat section and an expansion section, and the corresponding inner cavity channel is first contracted, then straightened and finally expanded; the expansion section of the high-temperature flow-limiting throat is provided with a circumferentially closed annular cavity, which is an oxygen gas collecting cavity; the expansion section of the high-temperature flow-limiting throat is also provided with a plurality of oxygen gas injection holes which are uniformly distributed in the circumferential direction and penetrate through the oxygen gas collecting cavity and the expansion section of the high-temperature flow-limiting throat.

[0010] The inner cavity channel of the mixing section is first straightened, then expanded and finally straightened again; the inner diameter of the inlet of the mixing section is the same as that of the outlet of the expansion section of the high-temperature flow-limiting throat, and the inner diameter of the outlet of the mixing section is the same as that of the combustion chamber.

[0011] The injector comprises a front cover plate, a rear cover plate and an injection unit; the front cover plate and the rear cover plate are cylindrical and have the same outer diameter; the rear cover plate is provided with a circular groove which is closed by the rear end surface of the front cover plate; a plurality of injection units which are centrally symmetrically distributed penetrate through the front cover plate and the rear cover plate in sequence from front to back; the front end surface of each injection unit is flush with the front end surface of the front cover plate, and the rear end surface of each injection unit is flush with the rear end surface of the rear cover plate; the cavity surrounded by the front cover plate, the rear cover plate and the injection unit is a hydrogen gas collecting cavity; the rear cover plate is provided with a hydrogen gas ring pipe in the circumferential direction, the hydrogen gas ring pipe and the hydrogen gas collecting cavity are connected through hydrogen gas straight pipes which are uniformly distributed in the circumferential direction of the rear cover plate, and the hydrogen gas ring pipe and the hydrogen gas straight pipes jointly constitute a hydrogen gas pipeline; the inner cavity channel of the injection unit is first contracted and then expanded, and the expansion section of each injection unit is provided with a plurality of hydrogen gas injection holes which are uniformly distributed in the circumferential direction.

[0012] In the high-temperature flow-limiting throat expansion section and the mixing section, high-pressure oxygen and high-temperature air are mixed to form high-temperature oxygen-enriched air, and the high-temperature oxygen-enriched air and high-pressure hydrogen gas are mixed to start combustion at the hydrogen gas injection hole of the injection unit, high-temperature and high-pressure combustion gas is generated in the combustion chamber, and the high-temperature and high-pressure combustion gas is accelerated to the required Mach number of the test through the nozzle to form a test gas flow.

[0013] Further, the hydrogen gas ring pipe is connected to the hydrogen gas straight pipe by welding, and the hydrogen gas straight pipe is connected to the rear cover plate by welding.

[0014] Further, the injection unit is connected to the front cover plate and the rear cover plate by welding.

[0015] Further, the materials of the injection unit, the combustion chamber and the nozzle are high-temperature alloys.

[0016] Further, the front cover plate and the rear cover plate are fixedly connected by interference fit through the end face annular groove and the annular boss.

[0017] Further, a sealing ring is arranged on the end face between the front cover plate and the rear cover plate, and the material of the sealing ring is red copper.

[0018] Further, the temperature of the high-temperature air ranges from 1100K to 1700K, and the temperature of the high-temperature and high-pressure combustion gas ranges from 2300K to 3000K.

[0019] Further, the pressure of the high-pressure oxygen ranges from 20MPa to 35MPa, the pressure of the high-pressure hydrogen ranges from 20MPa to 35MPa, and the pressure of the high-temperature and high-pressure combustion gas ranges from 20MPa to 30MPa.

[0020] Further, the distance between the hydrogen gas injection hole and the outlet of the injection unit expansion section is 0.1R-0.2R, and R is the inner diameter of the outlet of the injection unit expansion section.

[0021] Further, the calculation method of the hydrogen gas injection hole flow rate and the oxygen gas flow rate of the high-temperature flow-limiting throat of a single injection unit is as follows:

[0022]

[0023] Wherein: Gas flow rate, kg / s; Gas flow rate coefficient;

[0024] Gas nozzle circular hole flow area; Gas temperature;

[0025] Gas nozzle inlet pressure; --- Nozzle exit pressure

[0026] --- Gas constant

[0027] The pulse combustion wind tunnel hydrogen-oxygen combustion heater applied to high-temperature air inflow has the following characteristics:

[0028] a. The combustion organization mode of the pulse combustion wind tunnel hydrogen-oxygen combustion heater, oxygen and high-temperature air are mixed after being mixed in the high-temperature flow-limiting throat expansion section and the mixing section to form high-temperature oxygen-rich air, and then the high-temperature oxygen-rich air is mixed with hydrogen in the injection unit expansion section for combustion;

[0029] b. The oxygen and hydrogen injection mode, the oxygen is injected vertically to the inner wall surface of the high-temperature flow-limiting throat expansion section at the high-temperature flow-limiting throat expansion section, the hydrogen is injected vertically to the inner wall surface of the injection unit expansion section at the injection unit expansion section, and the injection position of the hydrogen is as close as possible to the outlet of the injection unit expansion section under the condition of structural strength;

[0030] c. The hydrogen-oxygen combustion heater structure, which is composed of a high-temperature flow-limiting throat, a mixing section, an injector, a combustion chamber and a nozzle, wherein the injector is composed of 7 injection units, 1 in the center and 6 uniformly distributed along the circumference.

[0031] The pulse combustion wind tunnel hydrogen-oxygen combustion heater applied to high-temperature air inflow of the application realizes effective mixing and combustion through the injection sequence and injection mode of high-temperature air, hydrogen and oxygen. Under the condition of high-temperature air inflow, self-ignition is realized, and an igniter is not needed, thereby reducing the complexity of the hydrogen-oxygen combustion heater system. The hydrogen-oxygen combustion heating temperature can reach above 3000K, thereby avoiding ablation of the hydrogen-oxygen combustion heater, and the hydrogen-oxygen combustion heater is suitable for pulse combustion wind tunnels and can be used for developing wind tunnel tests of air-breathing hypersonic aircraft. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structure schematic view (perspective view) of the pulse combustion wind tunnel hydrogen-oxygen combustion heater applied to high-temperature air inflow of the application;

[0033] Figure 2 It is a structure schematic view (front view) of the pulse combustion wind tunnel hydrogen-oxygen combustion heater applied to high-temperature air inflow of the application.

[0034] In the figure, 1. High-temperature flow-limiting throat; 2. Oxygen gas collecting cavity; 3. Oxygen injection hole; 4. Mixing section; 5. Front cover plate; 6. Rear cover plate; 7. Injection unit; 8. Hydrogen injection hole; 9. Hydrogen gas collecting cavity; 10. Hydrogen pipeline; 11. Combustion chamber; 12. Nozzle. DETAILED DESCRIPTION ​

[0035] The application will be described in detail below with reference to the accompanying drawings and examples.

[0036] As shown in Figure 1 , Figure 2 , the pulse combustion wind tunnel hydrogen-oxygen combustion heater applied to high-temperature air inflow of the embodiment comprises a high-temperature flow-limiting throat 1, an oxygen gas collecting cavity 2, oxygen gas injection holes 3, a mixing section 4, a front cover plate 5, a rear cover plate 6, an injection unit 7, hydrogen gas injection holes 8, a hydrogen gas collecting cavity 9, a hydrogen gas pipeline 10, a combustion chamber 11 and a nozzle 12.

[0037] The high-temperature flow-limiting throat 1 is connected to the high-temperature air pipeline at the upstream and connected to the mixing section 4 at the downstream through a flange; the high-temperature flow-limiting throat 1 comprises a contraction section, a throat section and an expansion section from front to back, and the corresponding inner cavity channel is first contracted, then straightened and finally expanded; the high-temperature flow-limiting throat 1 controls the flow of high-temperature air through the inner diameter of the throat section of the throat section, and the high-temperature air is mixed with the injected oxygen gas at the expansion section of the high-temperature flow-limiting throat 1 to form oxygen-enriched air;

[0038] The oxygen gas collecting cavity 2 is located at the expansion section of the high-temperature flow-limiting throat 1 and is a closed annular cavity arranged along the circumference of the expansion section of the high-temperature flow-limiting throat 1; normal-temperature high-pressure oxygen gas is filled into the oxygen gas collecting cavity 2 through an oxygen gas interface to form the oxygen gas collecting cavity 2;

[0039] The oxygen gas injection holes 3 are located at the expansion section of the high-temperature flow-limiting throat 1 and are 12 uniformly distributed through holes arranged along the circumference of the expansion section of the high-temperature flow-limiting throat 1, which connect the oxygen gas collecting cavity 2 and the inner cavity of the expansion section of the high-temperature flow-limiting throat 1; the central axis of the oxygen gas injection holes 3 is perpendicular to the inner wall of the expansion section of the high-temperature flow-limiting throat 1;

[0040] The mixing section 4 is connected to the expansion section of the high-temperature flow-limiting throat 1 at the upstream and connected to the injector at the downstream; the inner cavity channel of the mixing section 4 is first straightened, then expanded and finally straightened again; the inlet inner diameter of the mixing section 4 is the same as the outlet inner diameter of the expansion section of the high-temperature flow-limiting throat 1, and the outlet inner diameter of the mixing section 4 is the same as the inner diameter of the combustion chamber 11;

[0041] The front cover plate 5, the rear cover plate 6 and the injection unit 7 enclose the hydrogen gas collecting cavity 9; the front cover plate 5 is provided with 7 circular truncated cone-shaped holes I, with 1 in the center and 6 uniformly distributed along the circumference at the periphery; the injection unit 7 is inserted into the circular truncated cone-shaped hole I from front to back and welded and fixed in the circular truncated cone-shaped hole I;

[0042] The rear cover plate 6, the front cover plate 5, the rear cover plate 6 and the injection unit 7 enclose the hydrogen gas collecting cavity 9; 7 circular truncated cone holes II are arranged on the rear cover plate 6, one in the center and six uniformly distributed in the periphery; the injection unit 7 is inserted into the circular truncated cone hole II from front to back and is welded and fixed in the circular truncated cone hole II; the rear cover plate 6 is welded and connected with the hydrogen gas ring pipe through the 8 hydrogen gas straight pipes which are uniformly distributed in the periphery of the rear cover plate 6, the high-pressure hydrogen gas enters the hydrogen gas collecting cavity 9 through the hydrogen gas ring pipe and the hydrogen gas straight pipe in turn and is injected into the expansion section of the injection unit 7 through the hydrogen gas injection hole 8;

[0043] The injection unit 7, the injection unit 7 is welded and connected with the front cover plate 5 and the rear cover plate 6 and jointly constitutes the injector; the injector includes 7 injection units 7, one in the center and six uniformly distributed in the periphery; the injection unit 7 is a circular truncated cone with a front thick and a rear thin, the inner cavity channel of the injection unit 7 is an oxygen-rich air flow channel, the inner cavity channel of the injection unit 7 is contracted and then expanded; six hydrogen gas injection holes 8 are arranged in the periphery on the expansion section of each injection unit 7, the oxygen-rich air and the hydrogen gas are mixed and ignited to burn at the hydrogen gas injection hole 8, the temperature at the hydrogen gas injection hole 8 is high, in order to avoid ablation, the hydrogen gas injection hole 8 is arranged as close as possible to the outlet of the expansion section of the injection unit 7 under the condition that the structure permits;

[0044] The hydrogen gas injection hole 8, the hydrogen gas injection hole 8 of the injection unit 7 is communicated with the hydrogen gas collecting cavity 9, six hydrogen gas injection holes 8 are arranged in the periphery on the expansion section of each injection unit 7, the central axis of the hydrogen gas injection hole 8 is perpendicular to the inner wall of the expansion section of the injection unit 7;

[0045] The hydrogen gas collecting cavity 9, the front cover plate 5, the rear cover plate 6 and the injection unit 7 enclose the hydrogen gas collecting cavity 9; the normal-temperature and high-pressure hydrogen gas is gathered in the hydrogen gas collecting cavity 9 and is injected into the expansion section of the injection unit 7 through the hydrogen gas injection hole 8 of the injection unit 7;

[0046] The hydrogen gas pipeline 10 includes one hydrogen gas ring pipe and 8 hydrogen gas straight pipes, the hydrogen gas ring pipe is arranged outside the rear cover plate 6, the hydrogen gas ring pipe and the rear cover plate 6 are communicated through the 8 hydrogen gas straight pipes which are uniformly distributed in the periphery of the rear cover plate 6, the hydrogen gas ring pipe and the hydrogen gas straight pipe are welded and connected, the hydrogen gas straight pipe and the rear cover plate 6 are welded and connected; the normal-temperature and high-pressure hydrogen gas flows in the hydrogen gas ring pipe and enters the hydrogen gas collecting cavity 9 through the hydrogen gas straight pipe; the 8 hydrogen gas straight pipes are uniformly distributed in the periphery of the rear cover plate 6, which ensures that the hydrogen gas gas flow rate and pressure distribution in the hydrogen gas collecting cavity 9 are uniform;

[0047] The combustion chamber 11, the combustion chamber 11 is in a cylindrical shape, the hydrogen gas and the oxygen-rich air burn in the combustion chamber 11 to generate high-temperature and high-pressure combustion gas, for the high-enthalpy pulse combustion wind tunnel, the heat flow environment of the combustion chamber 11 is severe, it is necessary to use high-temperature resistant materials to ensure that the inner wall of the combustion chamber 11 is not ablated and damaged; the material of the combustion chamber 11 is high-temperature alloy;

[0048] The nozzle 12 has a converging-diverging inner cavity, high-temperature and high-pressure gas is accelerated to the required Mach number by the nozzle 12 to form a test gas flow, the heat flux density at the throat of the nozzle 12 is large, and high-temperature resistant material is required to ensure that the throat of the nozzle 12 is not ablated and damaged; the material of the nozzle 12 is a high-temperature alloy.

[0049] The calculation method of the hydrogen gas injection hole 8 flow of the single injection unit 7 and the oxygen gas flow of the high-temperature flow limiting throat 1 is as follows:

[0050]

[0051] Among them: -gas flow, kg / s; -gas flow coefficient;

[0052] -gas nozzle circular hole through-flow area; -gas temperature;

[0053] -gas nozzle inlet pressure; -nozzle outlet pressure;

[0054] -gas constant; -gas specific heat ratio.

[0055] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and all the features disclosed in the present application, or the steps in all the methods or processes disclosed in the present application, can be combined in any way, except for the mutually exclusive features and / or steps, without departing from the principles of the present application, and the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A hydrogen-oxygen combustion heater for pulse combustion wind tunnels with high-temperature airflow, characterized in that, The pulse combustion wind tunnel hydrogen-oxygen combustion heater includes a high-temperature flow-limiting throat (1), a mixing section (4), an injector, a combustion chamber (11), and a nozzle (12) connected sequentially from front to back. The high-temperature flow-limiting throat (1) consists of a contraction section, a throat section, and an expansion section from front to back. The corresponding internal cavity channels first contract, then straighten, and finally expand. The expansion section of the high-temperature flow-limiting throat (1) is provided with a circumferentially closed annular cavity, which is an oxygen collection cavity (2). The expansion section of the high-temperature flow-limiting throat (1) is also provided with several oxygen nozzles (3) that are evenly distributed circumferentially and connect the oxygen collection cavity (2) and the expansion section of the high-temperature flow-limiting throat (1). The inner cavity channel of the mixing section (4) is first straightened, then expanded, and finally straightened; the inner diameter of the inlet of the mixing section (4) is the same as the inner diameter of the outlet of the expansion section of the high temperature flow limiting throat (1), and the inner diameter of the outlet of the mixing section (4) is the same as the inner diameter of the combustion chamber (11). The injector consists of a front cover plate (5), a rear cover plate (6), and injection units (7); the front cover plate (5) and the rear cover plate (6) are cylindrical with the same outer diameter, and a circular groove is provided inside the rear cover plate (6), which is closed by the rear end face of the front cover plate (5); several injection units (7) are symmetrically distributed in the center and pass through the front cover plate (5) and the rear cover plate (6) from front to back; the front end face of each injection unit (7) is flush with the front end face of the front cover plate (5), and the rear end face of each injection unit (7) is flush with the rear end face of the rear cover plate (6). The rear end face is flush; the cavity formed by the front cover plate (5), the rear cover plate (6) and the injection unit (7) is the hydrogen gas collection chamber (9); a hydrogen ring pipe is provided in the circumference of the rear cover plate (6), and the hydrogen ring pipe and the hydrogen gas collection chamber (9) are connected by a hydrogen straight pipe evenly distributed in the circumference of the rear cover plate (6). The hydrogen ring pipe and the hydrogen straight pipe together constitute the hydrogen pipeline (10); the inner cavity channel of the injection unit (7) first contracts and then expands, and each injection unit (7) expansion section is provided with several hydrogen nozzles (8) evenly distributed in the circumference. In the expansion section and mixing section (4) of the high-temperature flow-limiting throat (1), high-pressure oxygen and high-temperature air are mixed to form high-temperature oxygen-enriched air. At the hydrogen nozzle (8) of the injection unit (7), the high-temperature oxygen-enriched air and high-pressure hydrogen are mixed and start to burn. High-temperature and high-pressure gas is generated in the combustion chamber (11). The high-temperature and high-pressure gas is accelerated to the required Mach number through the nozzle (12) to form the test gas flow.

2. The hydrogen-oxygen combustion heater for pulse combustion wind tunnels applied to high-temperature airflow as described in claim 1, characterized in that, The hydrogen ring pipe is connected to the hydrogen straight pipe by welding, and the hydrogen straight pipe is connected to the rear cover plate (6) by welding.

3. The hydrogen-oxygen combustion heater for pulse combustion wind tunnels applied to high-temperature airflow as described in claim 1, characterized in that, The injection unit (7) is connected to the front cover plate (5) and the rear cover plate (6) by welding.

4. The hydrogen-oxygen combustion heater for pulse combustion wind tunnels applied to high-temperature airflow as described in claim 1, characterized in that, The injection unit (7), combustion chamber (11) and nozzle (12) are all made of high-temperature alloy.

5. The hydrogen-oxygen combustion heater for pulse combustion wind tunnels applied to high-temperature airflow as described in claim 1, characterized in that, The front cover plate (5) and the rear cover plate (6) are fixedly connected by an interference fit of an annular groove and an annular boss on the end face.

6. The hydrogen-oxygen combustion heater for pulse combustion wind tunnels applied to high-temperature airflow as described in claim 1, characterized in that, A sealing ring is provided on the end face between the front cover plate (5) and the rear cover plate (6), and the sealing ring is made of copper.

7. The hydrogen-oxygen combustion heater for pulse combustion wind tunnels applied to high-temperature airflow as described in claim 1, characterized in that, The temperature range of the high-temperature air is 1100K-1700K, and the temperature range of the high-temperature and high-pressure gas is 2300K-3000K.

8. The hydrogen-oxygen combustion heater for pulse combustion wind tunnels applied to high-temperature airflow as described in claim 1, characterized in that, The pressure range of the high-pressure oxygen is 20MPa to 35MPa, the pressure range of the high-pressure hydrogen is 20MPa to 35MPa, and the pressure range of the high-temperature and high-pressure gas is 20MPa to 30MPa.

9. The hydrogen-oxygen combustion heater for pulse combustion wind tunnels applied to high-temperature airflow as described in claim 1, characterized in that, The distance between the hydrogen nozzle (8) and the outlet of the expansion section of the injection unit (7) is 0.1R~0.2R, where R is the inner diameter of the outlet of the expansion section of the injection unit (7).

10. The hydrogen-oxygen combustion heater for a pulse combustion wind tunnel applied to a high-temperature airflow as described in claim 1, characterized in that, The calculation methods for the flow rate of hydrogen nozzle (8) and oxygen flow rate of high-temperature flow-limiting throat (1) of the injection unit (7) are as follows: in: —Gas flow rate, kg / s; —Gas flow coefficient; —Flow area of ​​the gas nozzle orifice; —Gas temperature; —Gas nozzle inlet pressure; — Nozzle outlet pressure; —Gas constant; Specific heat ratio of gases.

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