Shock tube experimental device suitable for high-voltage ignition experiment and monopulse cracking experiment

Abstract

The invention discloses a shock tube experimental device which can realize switching between a high-voltage ignition experimental system and a monopulse cracking experimental system. When the shock tube experimental device is used as a high-voltage ignition experimental system, the shock tube experimental device comprises a shock tube body which comprises a high-voltage section, a middle section, a low-voltage section and a two-way section, and the two-way section is connected with the middle section and the low-voltage section through flanges; the gas pre-distribution system comprises an oxidant gas cylinder, a dilution gas cylinder and a gas mixing cylinder; the vacuum and pressure supply system comprises a vacuum pump, a sucking pump and a driving gas cylinder, and the vacuum pump and the sucking pump are used for vacuumizing the shock tube body into a vacuum environment; the driving gas cylinder is connected with the high-pressure section and the middle section through a pipeline; when the shock tube experimental device is used as a monopulse cracking experimental system, on the basis of the structure, the three-way section and the air leakage tank are used for replacing the two-way section, and the three-way section is respectively connected with the middle section, the low-pressure section and the air leakage tank through flanges.

Description

Technical Field

[0001] The invention relates to the field of ignition combustion and cracking experimental systems, and in particular to a shock tube experimental device suitable for high-voltage ignition experiments and single-pulse cracking experiments. Background Art

[0002] Shock tubes are experimental devices that can generate high temperature and high pressure instantly. They can heat materials to extremely high temperatures evenly in microseconds. They are ideal reactors for rapidly heating fuels to high temperature and high pressure. In the field of aerospace propellants, they can accurately measure the ignition delay time of the fuels to be tested or analyze the combustion cracking products. The control of the ignition delay time is crucial to ensure that the propellant ignites and generates thrust at the required time. 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 kinetic mechanism of fuel combustion reactions.

[0003] Conventional shock tubes can usually only conduct one type of experiment. For the two types of experiments, cracking and ignition, two different sets of experimental equipment are often required. The experimental environments provided for studying the cracking and ignition characteristics of the same fuel must be different, and the error is large. Moreover, only ignition delay time test experiments can be conducted at lower pressures and lower temperatures (below 2500K and below 40 atmospheres). Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a shock tube experimental device suitable for high-pressure ignition experiments and single-pulse cracking experiments, so as to solve the problems that two sets of devices are required for existing research on fuel ignition and cracking characteristics, and the comparability is not high.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A shock tube experimental device, characterized in that it can realize the switching between a high-voltage ignition experimental system and a single-pulse cracking experimental system;

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

[0008] The shock tube body comprises a high-pressure section, an intermediate section, a low-pressure section, and a two-way section, wherein the two-way section is connected to the intermediate section and the low-pressure section respectively through flanges, and a solenoid valve is arranged on the intermediate section;

[0009] Pre-distribution gas system; the pre-distribution gas system comprises an oxidant gas cylinder, a diluent gas cylinder and a mixing gas cylinder, wherein the mixing gas cylinder is provided with an opening for filling with fuel; the oxidant gas cylinder and the diluent gas cylinder are used to fill the oxidant and the diluent gas into the mixing gas cylinder through a pipeline, and the mixing gas cylinder is connected to the low-pressure section through a pipeline;

[0010] Vacuum and pressure supply system; the vacuum and pressure supply system includes a vacuum pump, an air extraction pump, and a driving gas cylinder, the vacuum pump is connected to the high-pressure section and the middle section through an air extraction pipe; the air extraction pump is connected to the low-pressure section through an air extraction pipe, and the vacuum pump and the air extraction pump are used to evacuate the shock tube body into a vacuum environment; the driving gas cylinder is connected to the high-pressure section and the middle section through a pipeline, and is used to fill the high-pressure section and the middle section with driving gas to provide the required pressure;

[0011] When the shock tube experimental device is used as a single pulse cracking experimental system, based on the above structure, the two-way section is replaced by a three-way section and a gas release tank, wherein the three-way section is connected to the middle section, the low-pressure section and the gas release tank respectively through flanges.

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

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

[0014] Furthermore, the vacuum pump and the exhaust pump are also used to remove the waste gas generated in the low-pressure section.

[0015] Furthermore, the vacuum and pressure supply system also includes a vacuum gauge, which is installed on the vacuum pipe connecting the vacuum pump and the low-pressure section, and is used to monitor the vacuum degree inside the shock tube body.

[0016] Furthermore, the physical property parameters include free radical concentration, composition and component content of the product gas.

[0017] When switching between the high-pressure ignition experiment system and the single-pulse cracking experiment system, the flange connection at the two-way section or the three-way section is loosened for switching. If a single-pulse cracking experiment is performed, the three-way section is aligned with the flange at the air release tank, and then aligned with the flanges at the middle section and the low-pressure section for installation; if a high-pressure ignition experiment is performed, the flange at the three-way section is loosened, the three-way section and the air release tank are removed, and the two-way section is connected to the middle section and the low-pressure section (11) through flanges.

[0018] Furthermore, gaskets are provided at the connection points of the flanges.

[0019] When the shock tube experimental device is used as a high-voltage ignition experimental system, the experimental process includes:

[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 conditions, and then select a suitable diaphragm according to the pressure difference of membrane rupture;

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

[0022] Step 3: Use a vacuum pump and an air extraction pump to evacuate the shock tube body;

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

[0024] Step 5: Fill the middle section and the high-pressure section with driving gas to the specified pressure respectively, then open the solenoid valve of the middle section to release the pressure, so that the pressure difference between the high-pressure section and the middle section increases instantly, causing the diaphragm between the high-pressure section and the middle section to rupture, and then the diaphragm between the two-way section and the middle section also ruptures under the action of the pressure difference, forming a shock wave;

[0025] 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 and the ignition delay is determined.

[0026] When the shock tube experimental device is used as a single pulse lysis 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 conditions, and then select a suitable diaphragm according to the membrane rupture pressure difference;

[0028] Step 2: Install the diaphragms between the high pressure section and the middle section, and between the middle section and the three-way section;

[0029] Step 3: Use a vacuum pump and an air extraction pump to evacuate the shock tube body;

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

[0031] Step 5: Fill the middle section and the high-pressure section with driving gas to the specified pressure, then open the solenoid valve of the middle section to release the pressure, so that the pressure difference between the high-pressure section and the middle section increases instantly, causing the diaphragm between the high-pressure section and the middle section to rupture, and then the diaphragm between the three-way section and the middle 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 cracking products are qualitatively and quantitatively analyzed according to the data collected by the gas chromatograph and mass spectrometer (18).

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

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

[0035] The shock tube experimental device of the present invention can be applied to both a single-pulse cracking experimental system and a high-pressure ignition experimental system, and two different types of experiments, high-pressure ignition and single-pulse cracking, are concentrated in one set of experimental devices, and the switching method is convenient and fast; it can greatly reduce the cost required for the experiment, and for the same fuel, its ignition and combustion characteristics can be better compared with its cracking characteristics, and its reaction mechanism can be further understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 4 is a structural diagram of a shock tube experimental device according to the present invention.

[0037] Explanation of the reference numerals: 1. vacuum pump; 2. high pressure section; 3. driving gas cylinder; 4. oxidant gas cylinder; 5. diluent gas cylinder; 6. middle section; 7. two-way section; 8. three-way section; 9. air release tank; 10. mixing tank; 11. low pressure section; 12. PCB pressure sensor; 13. vacuum gauge; 14. vacuum pump; 15. PCB constant current source signal conditioner; 6. electronic computer; 17. gas chromatograph; 18. mass spectrometer. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation modes, but the present invention is not limited thereto.

[0039] The present invention provides a shock tube experimental device, which is characterized in that it can realize the switching between a high-voltage ignition experimental system and a single-pulse cracking experimental system;

[0040] When the shock tube experimental device is used as a high-voltage ignition experimental system, it includes:

[0041] 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;

[0042] Pre-gas distribution system; the pre-gas distribution system includes 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 with fuel; the oxidant gas cylinder 4 and the diluent gas cylinder 5 fill the oxidant and the diluent gas into the mixing gas cylinder 10 through a pipeline, and the mixing gas cylinder 10 is connected to the low-pressure section 11 through a pipeline, and a connecting valve is provided on the pipeline;

[0043] Vacuum and pressure supply system; the vacuum and pressure supply system includes a vacuum pump 1, an exhaust pump 14, and a driving gas cylinder 3. The vacuum pump 1 is connected to the high-pressure section 2 and the middle section 6 through an exhaust pipe; the exhaust pump 14 is connected to the low-pressure section 11 through an exhaust pipe. The vacuum pump 1 and the exhaust pump 14 are used to evacuate the inside of the shock tube body to a vacuum environment, and are also used to immediately clean up the exhaust gas generated in the low-pressure section after the experiment; the driving gas cylinder 3 is connected to the high-pressure section 2 and the middle section 6 through a pipeline, and is used to fill the high-pressure section 2 and the middle section 6 with driving gas to provide the required pressure. In a preferred embodiment, the vacuum and pressure supply system also includes a vacuum gauge 13, which is located on the exhaust pipe connecting the exhaust pump 14 and the low-pressure section 11, and is used to monitor the vacuum degree inside the shock tube body.

[0044] When the shock tube experimental device is used as a single-pulse cracking experimental system, on the basis of the above structure, the two-way section 7 is replaced by the three-way section 8 and the air release tank 9, wherein the three-way section 8 is connected to the middle section 6, the low-pressure section 11, and the air release tank 9 respectively through flanges.

[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 and is used to measure shock waves at different positions; the PCB constant current source signal conditioner 15 is data-connected with the PCB pressure sensor 12 and is used to compensate the sensor signal; the gas chromatograph 17 and the mass spectrometer 18 are used to analyze the physical properties of the product gas, including the free radical concentration, composition and component content of the product gas; the electronic computer 16 is data-connected with the PCB constant current source signal conditioner 15, the chromatograph 17 and the mass spectrometer 18 and is used to analyze the reaction mechanism and characteristics of cracking and combustion.

[0047] When switching between the high-pressure ignition experiment system and the single-pulse cracking experiment system, loosen the flange connection at the two-way section 7 or the three-way section 8 for switching. If a single-pulse cracking experiment is to be conducted, align the bottom flange of the three-way section 8 with the top flange of the air release tank 9, and then align it with the flanges at the middle section 6 and the low-pressure section 11 before installation. If a high-pressure ignition experiment is to be conducted, loosen the flange at the three-way section 8, remove the three-way section 8 and the air release tank 9, and align the two-way section 7 with the flanges at the middle section 6 and the low-pressure section 11 before installation. In a preferred embodiment, gaskets are provided at the joints of the above flanges to ensure the airtightness of the experimental device.

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

[0049] Before the experiment begins, the equivalent ratio of fuel, oxidant and diluent is calculated. The fuel is filled into the mixing bottle 10 through the opening. The oxidant bottle 4 and the diluent bottle 5 fill the oxidant and diluent into the mixing bottle 10 through the pipeline and premix for a period of time. Then start the experiment:

[0050] 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 aluminum diaphragm according to the pressure difference of the membrane rupture;

[0051] Step 2, install the aluminum diaphragm between the high-pressure section 2 and the middle section 6, and between the middle section 6 and the two-way section 7 respectively;

[0052] Step 3: Use the vacuum pump 1 and the air pump 14 to evacuate the shock tube body to a vacuum state, and then turn off the air pump 14;

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

[0054] Step 5, respectively filling the middle section 6 and the high-pressure section 2 with driving gas to the specified pressure, then opening the solenoid valve of the middle section 6 to release the pressure, so that the pressure difference between the high-pressure section and the middle section increases instantly, causing the diaphragm between the high-pressure section and the middle section to rupture, and then the diaphragm between the two-way section 7 and the middle section 6 also ruptures 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 based on 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 invention is used as a single pulse cracking experimental system, the experimental process includes:

[0057] Before the experiment begins, the equivalent ratio of the fuel, oxidant and diluent is calculated, the fuel is filled into the mixing bottle 10 through the opening of the mixing bottle, the oxidant bottle 4 and the diluent bottle 5 fill the oxidant and diluent into the mixing bottle 10 through the pipeline and premix 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 conditions, 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 middle section 6, and between the middle section 6 and the three-way section 8 respectively;

[0060] Step 3: Use the vacuum pump 1 and the air pump 14 to evacuate the shock tube body to a vacuum state, and then turn off 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 release tank 9 and the three-way section 8, turn on the vacuum pump 14 again to evacuate the three-way section 8 and the low-pressure section 11 to vacuum, turn off the vacuum pump 14, 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, and close the connecting valve between the mixing bottle 10 and the low-pressure section 11;

[0062] Step 5, respectively filling the middle section 6 and the high-pressure section 2 with driving gas to the specified pressure, then opening the solenoid valve of the middle section 6 to release the pressure, so that the pressure difference between the high-pressure section and the middle section increases instantly, causing the diaphragm between the high-pressure section and the middle section to rupture, and then the diaphragm between the three-way section 8 and the middle section 6 also ruptures 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 combustion cracking products are qualitatively and quantitatively analyzed according to the gas chromatograph 17 and the mass spectrometer 18.

[0064] The shock tube experimental device of the present invention can be applied to both high-pressure ignition experiments and single-pulse cracking experiments. By using a replaceable flange interface to replace a two-way section or a three-way section, two different types of experiments, ignition and cracking, are concentrated in one set of experimental devices. Components can be replaced according to experimental needs, and the switching method is convenient and fast. This allows the cost required for the experiment to be greatly reduced. For the same fuel, by using the shock tube experimental device of the present invention, the comparison between the ignition and combustion characteristics and the cracking characteristics of the fuel is better, and the reaction mechanism of the fuel can be further understood.

[0065] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the same. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the present invention may be subjected to a number of modifications, improvements and equivalent substitutions, which are deemed to fall within the scope of protection of the claims of the present invention.

Claims

1. A shock tube experimental device, characterized in that: Able to realize the switching between high-voltage ignition experimental system and single-pulse cracking experimental system; When the shock tube experimental device is used as a high-voltage ignition experimental system, it includes: A shock tube body; the shock tube body comprises 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 the intermediate section (6) is provided with a solenoid valve; A pre-gas distribution system; the pre-gas distribution system comprises an oxidant gas cylinder (4), a diluent gas cylinder (5) and a gas mixing cylinder (10), wherein the gas mixing cylinder (10) is provided with an opening for charging fuel; the oxidant gas cylinder (4) and the diluent gas cylinder (5) charge the oxidant and the diluent gas into the gas mixing cylinder (10) via a pipeline, and the gas mixing cylinder (10) is connected to the low-pressure section (11) via a pipeline; A vacuum and pressure supply system; the vacuum and pressure supply system comprises a vacuum pump (1), an air extraction pump (14), and a driving gas cylinder (3); the vacuum pump (1) is connected to the high-pressure section (2) and the middle section (6) via an air extraction pipe; the air extraction pump (14) is connected to the low-pressure section (11) via an air extraction pipe; the vacuum pump (1) and the air extraction pump (14) are used to extract the inside of the shock tube body into a vacuum environment; the driving gas cylinder (3) is connected to the high-pressure section (2) and the middle section (6) via a pipeline, and is used to fill the high-pressure section (2) and the middle section (6) with driving gas to provide the required pressure; When the shock tube experimental device is used as the single-pulse cracking experimental system, on the basis of the above structure, the two-way section (7) is replaced by the three-way section (8) and the air release tank (9), wherein the three-way section (8) is connected to the middle section (6), the low-pressure section (11), and the air release tank (9) respectively through flanges.

2. The shock tube experimental device 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 arranged on the low-pressure section (11) and is used to measure shock waves at different positions; the PCB constant current source signal conditioner (15) is data-connected to the PCB pressure sensor (12) and is used to compensate for sensor signals; the gas chromatograph (17) and the mass spectrometer (18) are used to analyze physical property parameters of product gas; and the electronic computer (16) is data-connected to the PCB constant current source signal conditioner (15), the chromatograph (17) and the mass spectrometer (18) and is used to analyze reaction mechanisms and characteristics.

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

4. The shock tube experimental device 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 vacuum pipe connecting the vacuum pump (14) and the low-pressure section (11) and is used to monitor the vacuum degree inside the shock tube body.

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

6. The shock tube experimental device according to claim 1 or 2, characterized in that: When switching between the high-pressure ignition experiment system and the single-pulse cracking experiment system, the flange connection at the two-way section (7) or the three-way section (8) is loosened for switching. If the single-pulse cracking experiment is to be performed, the three-way section (8) is aligned with the flange at the air release tank (9), and then aligned with the flanges at the middle section (6) and the low-pressure section (11) for installation. If the high-pressure ignition experiment is to be performed, the flange at the three-way section (8) is loosened, the three-way section (8) and the air release tank (9) are removed, and the two-way section (7) is connected to the middle section (6) and the low-pressure section (11) through flanges.

7. The shock tube experimental device according to any one of claims 1 to 6, wherein gaskets are provided at the connection points of the flanges.

8. The shock tube experimental device according to claim 1, characterized in that: When the shock tube experimental device is used as the high-voltage ignition experimental system, the experimental process includes: Step 1, calculating the driving gas pressure of the high-pressure section (2) and the experimental gas pressure of the low-pressure section (11) under set working conditions, and then selecting a suitable diaphragm according to the pressure difference of membrane rupture; Step 2, installing the diaphragm between the high-pressure section (2) and the middle section (6), and between the middle section (6) and the two-way section (7); Step 3, using the vacuum pump (1) and the air extraction pump (14) to evacuate the shock tube body; Step 4, charging the pre-mixed experimental gas in the mixing bottle (10) into the low-pressure section (11) and the two-way section (7) to a specified pressure; Step 5, respectively filling the middle section (6) and the high-pressure section (2) with the driving gas to a specified pressure, then opening the solenoid valve of the middle section (6) to release the pressure, so that the pressure difference between the high-pressure section and the middle section increases instantly, causing the diaphragm between the high-pressure section and the middle section to rupture, and then the diaphragm between the two-way section (7) and the middle 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 according to the data collected by the PCB pressure sensor (12), and the ignition delay is determined.

9. The shock tube experimental device according to claim 1, characterized in that: When the shock tube experimental device is used as the single pulse cracking experimental system, the experimental process includes: Step 1, calculating the driving gas pressure of the high-pressure section (2) and the experimental gas pressure of the low-pressure section (11) under set working conditions, and then selecting a suitable diaphragm according to the membrane rupture pressure difference; Step 2, installing the diaphragm between the high-pressure section (2) and the middle section (6), and between the middle section (6) and the three-way section (8); Step 3, using the vacuum pump (1) and the air extraction pump (14) to evacuate the shock tube body; Step 4, the gas in the dilution gas bottle (5) is charged into the low-pressure section (11) to a specified pressure, and then the three-way section (8) and the low-pressure section (11) are evacuated to a vacuum by the vacuum pump (14), and the pre-mixed experimental gas in the mixing bottle (10) is charged into the low-pressure section (11) and the three-way section (8) to a specified pressure; Step 5, respectively filling the middle section (6) and the high-pressure section (2) with the driving gas to a specified pressure, then opening the solenoid valve of the middle section (6) to release the pressure, so that the pressure difference between the high-pressure section and the middle section increases instantly, causing the diaphragm between the high-pressure section and the middle section to rupture, and then the diaphragm between the three-way section (8) and the middle 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 according to the data collected by the PCB pressure sensor (12); and the cracking products are qualitatively and quantitatively analyzed according to the data collected by the gas chromatograph (17) and the mass spectrometer (18).

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

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