A shock tube experimental device suitable for high-pressure ignition experiment and single-pulse pyrolysis experiment

Abstract

The application discloses a shock tube experimental device which can realize switching of a high-pressure ignition experimental system and a single-pulse cracking experimental system; when the shock tube experimental device is used as the high-pressure ignition experimental system, the device comprises a shock tube body which comprises a high-pressure section, an intermediate section and a low-pressure section, and further comprises a two-way section, wherein the two-way section is connected with the intermediate section and the low-pressure section through flanges; a pre-gas distribution system which comprises an oxidant gas cylinder, a diluent gas cylinder and a gas mixing cylinder; a vacuum and pressure supply system which comprises a vacuum pump, a gas extraction pump and a driving gas cylinder, wherein the vacuum pump and the gas extraction pump are used for extracting the shock tube body into a vacuum environment; and the driving gas cylinder is connected with the high-pressure section and the intermediate section through a pipeline; when the shock tube experimental device is used as the single-pulse cracking experimental system, a three-way section and a gas exhaust tank are used to replace the two-way section on the basis of the above structure, wherein the three-way section is connected with the intermediate section, the low-pressure section and the gas exhaust tank through flanges.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ignition combustion and pyrolysis experimental system, and particularly relates to a shock tube experimental device suitable for high-pressure ignition experiment and single-pulse pyrolysis experiment. BACKGROUND

[0002] The shock tube is an experimental device that can instantly generate high temperature and high pressure, and can uniformly heat the substance to an extremely high temperature in a time of microsecond order. It is an ideal reactor for rapidly heating the measured fuel to high temperature and high pressure, and can accurately measure the ignition delay time of the measured fuel or analyze the combustion and pyrolysis products in the field of space propulsion agent. The control of the ignition delay time is crucial to ensure that the propellant ignites at the required time and generates thrust. The length of the delay time may affect the performance, stability and safety of the rocket or engine, and can be used to construct the fuel combustion reaction kinetics mechanism.

[0003] The traditional shock tube can usually only perform one type of experiment. For the two types of experiments of pyrolysis and ignition, two different experimental devices are often needed. The experimental environment provided for studying the pyrolysis and ignition characteristics of the same fuel is certainly different, and the error is large. Moreover, only the ignition delay time test experiment at a lower pressure and a lower temperature (in the range of lower than 2500K temperature and lower than 40 atmospheres) can be performed. SUMMARY

[0004] In view of this, the purpose of the present application is to provide a shock tube experimental device suitable for high-pressure ignition experiment and single-pulse pyrolysis experiment, so as to solve the problems of the need for two devices and the low comparability when studying the ignition and pyrolysis characteristics of the fuel.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A shock tube experimental device, characterized in that it can realize the switching of a high-pressure ignition experiment system and a single-pulse pyrolysis experiment system.

[0007] When the shock tube experimental device is used as a high-pressure ignition experiment system, it comprises:

[0008] A shock tube body; the shock tube body comprises a high-pressure section, an intermediate section and a low-pressure section, and further comprises a two-way section, wherein the two-way section is connected with the intermediate section and the low-pressure section through flanges, and an electromagnetic valve is arranged on the intermediate section;

[0009] A pre-gas system; the pre-gas system comprises an oxidant gas cylinder, a diluent gas cylinder and a gas mixing cylinder, wherein the gas mixing cylinder is provided with an opening for charging fuel; the oxidant gas cylinder and the diluent gas cylinder charge the oxidant and the diluent gas into the gas mixing cylinder through pipelines, and the gas mixing cylinder is connected with the low-pressure section through a pipeline;

[0010] The vacuum and pressure supply system comprises a vacuum pump, an air extraction pump and a driving gas cylinder, the vacuum pump is connected with the high pressure section and the intermediate section through an air extraction pipe, the air extraction pump is connected with the low pressure section through an air extraction pipe, and the vacuum pump and the air extraction pump are used to extract the interior of the shock tube into a vacuum environment; the driving gas cylinder is connected with the high pressure section and the intermediate section through a pipe, and is used to fill the driving gas into the high pressure section and the intermediate section to provide the required pressure.

[0011] When the shock tube experimental device is used as a single pulse dissociation experimental system, the two-way section is replaced by a three-way section and an air exhaust tank on the basis of the above structure, wherein the three-way section is connected with the intermediate section, the low pressure section and the air exhaust tank through flanges respectively.

[0012] Further, the information acquisition system comprises a PCB pressure sensor, a PCB constant current source signal conditioner, an electronic computer and a gas chromatograph and mass spectrometer.

[0013] The PCB pressure sensor is arranged on the low pressure section and is used to measure the shock wave at different positions; the PCB constant current source signal conditioner is connected with the PCB pressure sensor in data and is used to compensate the sensor signal; the gas chromatograph and the mass spectrometer are used to analyze the physical parameters of the product gas; and the electronic computer is connected with the PCB constant current source signal conditioner, the gas chromatograph and the mass spectrometer in data and is used to analyze the reaction mechanism and characteristics.

[0014] Further, the vacuum pump and the air extraction pump are also used to extract the waste gas generated in the low pressure section.

[0015] Further, the vacuum and pressure supply system further comprises a vacuum gauge, which is arranged on the air extraction pipe connecting the air extraction pump and the low pressure section and is used to monitor the vacuum degree in the interior of the shock tube.

[0016] Further, the physical parameters comprise the free radical concentration, the composition and the component content of the product gas.

[0017] When the high pressure ignition experimental system and the single pulse dissociation experimental system are converted, the flanges at the two-way section or the three-way section are loosened to switch; if the single pulse dissociation experiment is performed, the flanges at the three-way section and the air exhaust tank are aligned, and then the flanges at the intermediate section and the low pressure section are aligned to be installed; if the high pressure ignition experiment is performed, the flanges at the three-way section are loosened, the three-way section and the air exhaust tank are removed, and the two-way section is connected with the intermediate section and the low pressure section (11) through the flanges.

[0018] Further, the flanges are provided with gaskets.

[0019] When the shock tube experimental device is used as a high pressure ignition experimental system, the experimental process comprises:

[0020] Step 1, calculate the driving gas pressure of the high-pressure section and the experimental gas pressure of the low-pressure section under the set working condition, and then select a suitable diaphragm according to the pressure difference of the diaphragm rupture;

[0021] Step 2, install the diaphragm between the high-pressure section and the intermediate section, and between the intermediate section and the two-way section;

[0022] Step 3, use the vacuum pump and the air pump to evacuate the shock tube body to vacuum;

[0023] Step 4, fill the experimental gas mixed in the gas mixing bottle into the low-pressure section and the two-way section to the specified pressure;

[0024] Step 5, fill the driving gas into the intermediate section and the high-pressure section to the specified pressure, then open the electromagnetic valve of the intermediate section to release pressure, so that the pressure difference between the high-pressure section and the intermediate section increases instantaneously, the diaphragm between the high-pressure section and the intermediate section ruptures, and then the diaphragm between the two-way section and the intermediate section also ruptures under the action of the pressure difference, forming a shock wave;

[0025] Step 6, after the shock wave is formed, calculate the running speed of the incident shock wave according to the data collected by the PCB pressure sensor and determine the ignition delay.

[0026] When the shock tube experimental device is used as a single-pulse pyrolysis experimental system, the experimental process includes:

[0027] Step 1, calculate the driving gas pressure of the high-pressure section and the experimental gas pressure of the low-pressure section under the set working condition, and then select a suitable diaphragm according to the pressure difference of the diaphragm rupture;

[0028] Step 2, install the diaphragm between the high-pressure section and the intermediate section, and between the intermediate section and the three-way section;

[0029] Step 3, use the vacuum pump and the air pump to evacuate the shock tube body to vacuum;

[0030] Step 4, fill the gas in the dilution gas bottle into the low-pressure section to the specified pressure, then evacuate the three-way section and the low-pressure section to vacuum by the air pump, and fill the experimental gas mixed in the gas mixing bottle into the low-pressure section and the three-way section to the specified pressure;

[0031] Step 5, fill the driving gas into the intermediate section and the high-pressure section to the specified pressure, then open the electromagnetic valve of the intermediate section to release pressure, so that the pressure difference between the high-pressure section and the intermediate section increases instantaneously, the diaphragm between the high-pressure section and the intermediate section ruptures, and then the diaphragm between the three-way section and the intermediate section also ruptures under the action of the pressure difference, forming a shock wave;

[0032] Step 6, after the shock wave is formed, the running speed of the incident shock wave is calculated according to the data collected by the PCB pressure sensor; and the qualitative and quantitative analysis of the cracking products is carried out according to the data collected by the gas chromatograph and mass spectrometer (18).

[0033] Further, the diaphragm is an aluminum diaphragm.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] The shock wave tube experimental device of the present application can be simultaneously applied to a single pulse cracking experimental system and a high pressure ignition experimental system, and can concentrate two different types of experiments of high pressure ignition and single pulse cracking in one set of experimental device, and the switching mode is convenient and fast; the cost required by the experiment can be greatly reduced, and for the same fuel, the ignition and combustion characteristics and the cracking characteristics can be better compared, and the reaction mechanism can be further understood. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structural diagram of the shock wave tube experimental device according to the present application.

[0037] Explanation of reference numerals: 1. Vacuum pump; 2. High pressure section; 3. Driving gas cylinder; 4. Oxidizing agent gas cylinder; 5. Dilution gas cylinder; 6. Intermediate section; 7. Two-way section; 8. Three-way section; 9. Bleed tank; 10. Gas mixing tank; 11. Low pressure section; 12. PCB pressure sensor; 13. Vacuum gauge; 14. Air suction pump; 15. PCB constant current source signal conditioner; 6. Electronic computer; 17. Gas chromatograph; 18. Mass spectrometer. DETAILED DESCRIPTION

[0038] The present application will be described in detail below in combination with the drawings and specific embodiments, but the present application is not limited thereto.

[0039] The present application provides a shock wave tube experimental device, which is characterized in that the switching of a high pressure ignition experimental system and a single pulse cracking experimental system can be realized.

[0040] When the shock wave tube experimental device is used as a high pressure ignition experimental system, it comprises:

[0041] A shock wave tube body; the shock wave tube body comprises a high pressure section 2, an intermediate section 6 and a low pressure section 11, and further comprises a two-way section 7, wherein the two-way section 7 is connected with the intermediate section 6 and the low pressure section 11 through flanges respectively, and an electromagnetic valve is arranged on the intermediate section 6;

[0042] A pre-gas system, which comprises an oxidant gas cylinder 4, a diluent gas cylinder 5 and a mixing gas cylinder 10, wherein the mixing gas cylinder 10 is provided with an opening for filling fuel; the oxidant gas cylinder 4 and the diluent gas cylinder 5 are connected to the mixing gas cylinder 10 through pipes for filling oxidant and diluent gas into the mixing gas cylinder 10, and the mixing gas cylinder 10 is connected to the low pressure section 11 through a pipe provided with a connecting valve;

[0043] A vacuum and pressure supply system, which comprises a vacuum pump 1, an exhaust pump 14 and a driving gas cylinder 3, wherein the vacuum pump 1 is connected to the high pressure section 2 and the intermediate section 6 through an exhaust pipe, the exhaust pump 14 is connected to the low pressure section 11 through an exhaust pipe, and the vacuum pump 1 and the exhaust pump 14 are used to create a vacuum environment in the shock tube and to clean the exhaust gas in the low pressure section 11 immediately after the experiment; the driving gas cylinder 3 is connected to the high pressure section 2 and the intermediate section 6 through a pipe for filling driving gas into the high pressure section 2 and the intermediate section 6 to provide the required pressure. In a preferred embodiment, the vacuum and pressure supply system further comprises a vacuum gauge 13, which is located on the exhaust pipe connecting the exhaust pump 14 and the low pressure section 11, for monitoring the vacuum degree inside the shock tube.

[0044] When the shock tube experimental device is used as a single-pulse pyrolysis experimental system, the two-way section 7 is replaced by a three-way section 8 and a gas exhaust tank 9 based on the above structure, wherein the three-way section 8 is connected to the intermediate section 6, the low pressure section 11 and the gas exhaust tank 9 through flanges respectively.

[0045] Preferably, the shock tube experimental device further comprises an information acquisition system, which comprises a PCB pressure sensor 12, a PCB constant current source signal conditioner 15, an electronic computer 16, a gas chromatograph 17 and a mass spectrometer 18.

[0046] The PCB pressure sensor 12 is arranged on the low pressure section 11 for measuring the shock wave at different positions; the PCB constant current source signal conditioner 15 is connected to the PCB pressure sensor 12 for compensating the sensor signal; the gas chromatograph 17 and the mass spectrometer 18 are used to analyze the physical parameters of the product gas, including the free radical concentration, composition and component content of the product gas; the electronic computer 16 is connected to the PCB constant current source signal conditioner 15, the gas chromatograph 17 and the mass spectrometer 18 for analyzing the reaction mechanism and characteristics of pyrolysis and combustion.

[0047] When the high-pressure ignition experiment system is converted into the single-pulse dissociation experiment system, the flanges at the two-way section 7 or the three-way section 8 are loosened for switching. If the single-pulse dissociation experiment is performed, the flange at the bottom of the three-way section 8 is aligned with the flange at the top of the gas exhaust tank 9, and then the flanges at the two-way section 7, the intermediate section 6 and the low-pressure section 11 are aligned for installation. If the high-pressure ignition experiment is performed, the flange at the three-way section 8 is loosened, and the three-way section 8 and the gas exhaust tank 9 are dismounted. Then, the flanges at the two-way section 7, the intermediate section 6 and the low-pressure section 11 are aligned for installation. In a preferred embodiment, a gasket is arranged at the connection of each flange to ensure the air tightness of the experimental device.

[0048] Based on the above device, when the device is used as a high-pressure ignition experiment system, the experimental process includes:

[0049] Before the experiment starts, the equivalence ratio of the fuel, the oxidant and the dilution gas is calculated. The fuel is filled into the gas mixing bottle 10 through the opening of the gas mixing bottle 10. The oxidant gas bottle 4 and the dilution gas bottle 5 fill the oxidant and the dilution gas into the gas mixing bottle 10 through the pipeline and pre-mix for a period of time. Then the experiment starts.

[0050] Step 1, the driving gas pressure of the high-pressure section 2 and the experimental gas pressure of the low-pressure section 11 under the set working condition are calculated, and then a suitable aluminum diaphragm is selected according to the pressure difference of the membrane breaking;

[0051] Step 2, the aluminum diaphragm is installed between the high-pressure section 2 and the intermediate section 6 and between the intermediate section 6 and the two-way section 7;

[0052] Step 3, the shock tube body is pumped to vacuum by using the vacuum pump 1 and the air pump 14, and the air pump 14 is closed;

[0053] Step 4, the experimental gas pre-mixed in the gas mixing bottle 10 is filled into the low-pressure section 11 and the two-way section 7 to the specified pressure, and the connecting valve between the gas mixing bottle 10 and the low-pressure section 11 is closed;

[0054] Step 5, the driving gas is filled into the intermediate section 6 and the high-pressure section 2 to the specified pressure, and then the electromagnetic valve of the intermediate section 6 is opened for pressure relief, so that the pressure difference between the high-pressure section and the intermediate section is instantaneously increased, the diaphragm between the high-pressure section and the intermediate section is broken, and then the diaphragm between the two-way section 7 and the intermediate section 6 is also broken under the action of the pressure difference, forming a shock wave;

[0055] Step 6, after the shock wave is formed, the running speed (Mach number Ms) of the incident shock wave is calculated according to the data collected by the PCB pressure sensor 12, and the ignition delay is determined.

[0056] When the shock tube experimental device of the present application is used as a single-pulse dissociation experiment system, the experimental process includes:

[0057] The equivalence ratio of fuel, oxidant and dilution gas is calculated before the experiment, fuel is filled into the bottle through the opening of the gas mixing bottle 10, and the oxidant gas bottle 4 and the dilution gas bottle 5 are connected by pipelines to fill the oxidant and dilution gas into the gas mixing bottle 10 and pre-mix for a period of time.

[0058] Step 1, calculate the driving gas pressure of the high-pressure section 2 and the experimental gas pressure of the low-pressure section 11 under the set working condition, and then select a suitable aluminum diaphragm according to the membrane rupture pressure difference;

[0059] Step 2, install the aluminum diaphragm between the high-pressure section 2 and the intermediate section 6, and between the intermediate section 6 and the three-way section 8;

[0060] Step 3, use the vacuum pump 1 and the air pump 14 to pump the shock tube body to vacuum, and close the air pump 14;

[0061] Step 4, fill the gas in the dilution gas bottle 5 into the low-pressure section 11 to the specified pressure, then close the connecting valve between the air tank 9 and the three-way section 8, open the air pump 14 again to pump the three-way section 8 and the low-pressure section 11 to vacuum, close the air pump 14, fill the pre-mixed experimental gas in the gas mixing bottle 10 into the low-pressure section 11 and the three-way section 8 to the specified pressure, and close the connecting valve between the gas mixing bottle 10 and the low-pressure section 11;

[0062] Step 5, fill the driving gas into the intermediate section 6 and the high-pressure section 2 to the specified pressure, then open the electromagnetic valve of the intermediate section 6 to release pressure, so that the pressure difference between the high-pressure section and the intermediate section increases instantaneously, the diaphragm between the high-pressure section and the intermediate section breaks, and then the diaphragm between the three-way section 8 and the intermediate section 6 also breaks under the action of the pressure difference, forming a shock wave;

[0063] Step 6, after the shock wave is formed, the running speed (Mach number Ms) of the incident shock wave is calculated according to the data collected by the PCB pressure sensor 12; and the qualitative and quantitative analysis of the combustion and cracking products is carried out by the gas chromatograph 17 and the mass spectrometer 18.

[0064] The shock tube experimental device of the application can be used for high-pressure ignition experiment and single-pulse cracking experiment at the same time, by using replaceable flange interfaces to replace the two-way section or the three-way section, so that the ignition and cracking two different types of experiments are concentrated in one set of experimental device, and the components are replaced according to the experimental needs, the switching mode is convenient and fast; this allows to greatly reduce the cost required for the experiment, and for the same fuel, the use of the shock tube experimental device of the application makes the comparison of the ignition and combustion characteristics and the cracking characteristics of the fuel better, and the reaction mechanism of the fuel can be further understood.

[0065] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the present application; although the present application has been described in detail with reference to the foregoing examples, it should be understood by those skilled in the art that the present application can be modified, improved and equivalently replaced in several ways, and these modifications, improvements and equivalent replacements are also considered to fall within the protection scope of the claims of the present application.

Claims

1. A shock tube experimental apparatus, characterized in that, It can switch between the high-voltage ignition experimental system and the single-pulse pyrolysis experimental system; When the shock tube experimental device is used as a high-pressure ignition experimental system, it includes: a shock tube body; the shock tube body includes a high-pressure section (2), an intermediate section (6), a low-pressure section (11), and a two-way section (7), wherein the two-way section (7) is connected to the intermediate section (6) and the low-pressure section (11) respectively through flanges, and a solenoid valve is provided on the intermediate section (6); A pre-mixed gas system; the pre-mixed gas system includes an oxidant gas cylinder (4), a dilution gas cylinder (5) and a mixing gas cylinder (10), wherein the mixing gas cylinder (10) is provided with an opening for filling fuel; the oxidant gas cylinder (4) and the dilution gas cylinder (5) are connected to the mixing gas cylinder (10) through a pipeline to fill the mixing gas cylinder (10), and the mixing gas cylinder (10) is connected to the low-pressure section (11) through a pipeline; A vacuum and pressure supply system; the vacuum and pressure supply system includes a vacuum pump (1), a vacuum pump (14), and a driving gas cylinder (3). The vacuum pump (1) is connected to the high-pressure section (2) and the intermediate section (6) through a vacuum pipe. The vacuum pump (14) is connected to the low-pressure section (11) through a vacuum pipe. The vacuum pump (1) and the vacuum pump (14) are used to create a vacuum environment inside the shock tube. The driving gas cylinder (3) is connected to the high-pressure section (2) and the intermediate section (6) through a pipe. It is used to fill the high-pressure section (2) and the intermediate section (6) with driving gas to provide the required pressure. When the shock tube experimental device is used as the single-pulse pyrolysis experimental system, the two-way section (7) is replaced with a three-way section (8) and a venting tank (9) based on the above structure. The three-way section (8) is connected to the intermediate section (6), the low-pressure section (11), and the venting tank (9) respectively through flanges.

2. The shock tube experimental apparatus according to claim 1, characterized in that, It also includes an information acquisition system, which includes a PCB pressure sensor (12), a PCB constant current source signal conditioner (15), an electronic computer (16), a gas chromatograph (17), and a mass spectrometer (18); The PCB pressure sensor (12) is installed on the low-pressure section (11) to measure shock waves at different locations; the PCB constant current source signal conditioner (15) is connected to the PCB pressure sensor (12) for compensating the sensor signal; the gas chromatograph (17) and the mass spectrometer (18) are used to analyze the physical properties of the product gas; the computer (16) is connected to the PCB constant current source signal conditioner (15), the gas chromatograph (17), and the mass spectrometer (18) for analyzing the reaction mechanism and characteristics.

3. The shock tube experimental apparatus according to claim 1 or 2, characterized in that, The vacuum pump (1) and the air pump (14) are also used to remove the waste gas generated in the low-pressure section (11).

4. The shock tube experimental apparatus according to claim 1 or 2, characterized in that, The vacuum and pressure supply system also includes a vacuum gauge (13), which is installed on the suction pipe connecting the suction pump (14) and the low-pressure section (11) to monitor the vacuum level inside the shock tube.

5. The shock tube experimental apparatus according to claim 2, characterized in that, The physical properties include the free radical concentration, composition, and component content of the product gas.

6. The shock tube experimental apparatus according to claim 2, characterized in that, When switching between the high-pressure ignition test system and the single-pulse pyrolysis test system, the flange connection at the two-way section (7) or the three-way section (8) is loosened for switching. If the single-pulse pyrolysis test is performed, the flange at the three-way section (8) and the vent tank (9) is aligned, and then aligned with the flange at the middle section (6) and the low-pressure section (11) for installation. If the high-pressure ignition test is performed, the flange at the three-way section (8) is loosened, the three-way section (8) and the vent tank (9) are removed, and the two-way section (7) is connected to the middle section (6) and the low-pressure section (11) through the flange.

7. The shock tube experimental apparatus according to claim 1 or 6, characterized in that, Gaskets are provided at all flange connections.

8. The shock tube experimental apparatus according to claim 2, characterized in that, When the shock tube experimental device is used as the high-voltage ignition experimental system, the experimental process includes: Step 1: Calculate the driving gas pressure of the high-pressure section (2) and the experimental gas pressure of the low-pressure section (11) under the set working conditions, and then select a suitable diaphragm based on the pressure difference of the ruptured membrane. Step 2: Install the diaphragm between the high-voltage section (2) and the intermediate section (6), and between the intermediate section (6) and the two-way section (7); Step 3: Use the vacuum pump (1) and the air pump (14) to evacuate the shock tube body to a vacuum; Step 4: Fill the low-pressure section (11) and the two-way section (7) with the pre-mixed experimental gas in the gas mixing bottle (10) to the specified pressure; Step 5: The driving gas is injected into the intermediate section (6) and the high-pressure section (2) to the specified pressure. Then, the solenoid valve of the intermediate section (6) is opened to release pressure, so that the pressure difference between the high-pressure section (2) and the intermediate section (6) increases instantaneously, causing the diaphragm between the high-pressure section (2) and the intermediate section (6) to rupture. Then, the diaphragm between the two-way section (7) and the intermediate section (6) also ruptures under the action of the pressure difference, forming a shock wave. Step 6: After the shock wave is formed, the running speed of the incident shock wave is calculated based on the data collected by the PCB pressure sensor (12), and the ignition delay is determined.

9. The shock tube experimental apparatus according to claim 2, characterized in that, When the shock tube experimental setup is used as the single-pulse pyrolysis experimental system, the experimental procedure includes: Step 1: Calculate the driving gas pressure of the high-pressure section (2) and the experimental gas pressure of the low-pressure section (11) under the set working conditions, and then select a suitable diaphragm based on the membrane rupture pressure difference; Step 2: Install the diaphragm between the high-voltage section (2) and the intermediate section (6), and between the intermediate section (6) and the three-way section (8); Step 3: Use the vacuum pump (1) and the air pump (14) to evacuate the shock tube body to a vacuum; Step 4: Fill the gas in the dilution gas cylinder (5) into the low-pressure section (11) to the specified pressure, and then use the vacuum pump (14) to evacuate the three-way section (8) and the low-pressure section (11) to a vacuum, and fill the pre-mixed experimental gas in the mixing bottle (10) into the low-pressure section (11) and the three-way section (8) to the specified pressure; Step 5: The driving gas is injected into the intermediate section (6) and the high-pressure section (2) to the specified pressure. Then, the solenoid valve of the intermediate section (6) is opened to release pressure, so that the pressure difference between the high-pressure section (2) and the intermediate section (6) increases instantaneously, causing the diaphragm between the high-pressure section (2) and the intermediate section (6) to rupture. Then, the diaphragm between the three-way section (8) and the intermediate section (6) also ruptures under the action of the pressure difference, forming a shock wave. Step 6: After the shock wave is formed, the running speed of the incident shock wave is calculated based on the data collected by the PCB pressure sensor (12); and the pyrolysis products are qualitatively and quantitatively analyzed based on the data collected by the gas chromatograph (17) and the mass spectrometer (18).

10. The shock tube experimental apparatus according to claim 8 or 9, characterized in that, The diaphragm is an aluminum diaphragm.

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