Device and method for measuring combustible gas liquid-phase substance parameter burning and explosion characteristics in wide temperature range

Abstract

The invention provides a device and method for measuring combustible gas liquid phase substance parameter burning and explosion characteristics in a wide temperature zone, and relates to the technical field of fuel combustion experiment measurement, the device comprises a constant volume combustion bomb cavity, optical windows are installed at the two ends of the constant volume combustion bomb cavity, and a high pressure sensor is installed on the constant volume combustion bomb cavity. An oil sprayer and a circulating pipe are mounted on the constant-volume combustion bomb cavity corresponding to one side of the high-pressure sensor, and a thermocouple is mounted on the constant-volume combustion bomb cavity corresponding to one side, far away from the oil sprayer, of the high-pressure sensor. According to the invention, through the designed gas inlet and exhaust system, measurement of combustible gas phase substance parameter burning and explosion characteristics can be realized, and accurate control of the liquid inlet system can research combustible liquid phase substance parameter burning and explosion characteristics; and meanwhile, the flame form evolution and the instantaneous pressure accumulation behavior can be synchronously measured by combining the computer with the schlieren system and the instantaneous pressure acquisition system, so that the measurement of the gas-phase material parameter and the combustible liquid-phase material parameter burning and explosion characteristics in the same experimental equipment is realized.

Description

Technical Field

[0001] The invention relates to the technical field of fuel combustion experimental measurement, and in particular to a device and method for measuring the combustion and explosion characteristics of combustible liquid phase material parameters in a wide temperature range. Background Art

[0002] When storing, transporting and using gaseous fuels, leakage problems often occur, which may lead to the risk of explosion in confined spaces. Therefore, experiments must be conducted to measure the explosion characteristics of flammable gases in confined spaces. These experiments can help assess the risk of explosion, develop prevention strategies, and improve the overall safety level. Through experimental verification, we can better understand the explosion process and take effective measures to reduce the probability and severity of explosion accidents.

[0003] When studying the combustion mechanism of fuel, since the combustion space is closed and the combustion process cannot be observed directly, it is necessary to conduct research on constant volume combustion bombs. Constant volume combustion bombs are a closed container used to study premixed combustion, and their structure is simple and practical. As an important tool for basic research on fuel combustion theory, it can provide data on flame burning speed, propagation speed, flame stability, and combustion pressure. Through auxiliary testing equipment, these parameters can be obtained more accurately, which provides great convenience and support for the study of combustion mechanism.

[0004] In order to explore the effect of initial temperature on the combustion and explosion characteristics of fuel, it is necessary to control the initial temperature of the experimental system. Using only a single heating system can easily cause the initial temperature of the mixed fuel to exceed the preset temperature, so it is necessary to wait for natural cooling to the preset temperature, which will inevitably greatly reduce the efficiency of the experiment. In addition, for the existing fuel combustion and explosion characteristics research and testing equipment, the combustion and explosion characteristics tests of liquid fuel and gas fuel are carried out in different incendiary bomb experimental equipment, which will cause a certain waste of resources. The existing experimental equipment has certain defects. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings existing in the prior art. The present invention provides a device and method for measuring the combustion and explosion characteristics of combustible liquid phase material parameters in a wide temperature range, including a temperature-controllable simultaneous refrigeration and heating system applied to a constant volume combustion bomb, so as to shorten the time of experimental research and improve experimental efficiency. On this basis, a refrigeration device with a lower temperature is developed to construct a temperature control system with a wide temperature range of a dual refrigeration circuit combined with a heating circuit. At the same time, a cavity is designed for independent explosion experiments on the gas phase and the liquid phase to save experimental costs.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a device for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas in a wide temperature range, comprising a constant volume combustion bomb cavity, optical windows are installed at both ends of the constant volume combustion bomb cavity, a high pressure sensor is installed on the constant volume combustion bomb cavity corresponding to one side of the high pressure sensor, an injector and a circulation pipe are installed on the constant volume combustion bomb cavity corresponding to the side of the high pressure sensor away from the injector, a thermocouple is installed on the constant volume combustion bomb cavity corresponding to the side of the high pressure sensor away from the injector, the thermocouple is connected to a temperature control system, a temperature sensor is installed on the corresponding constant volume combustion bomb cavity shell between the high pressure sensor and the thermocouple, a signal connection is made between the temperature control system and the high pressure sensor and the temperature sensor, two exhaust pipes are provided on the constant volume combustion bomb cavity, the exhaust pipe is connected to a vacuum pump through a valve group, the exhaust pipe is connected to a circulation pump through another valve group, and the circulation pump is connected to the other exhaust pipe through the valve group;

[0007] A point light source is provided on one side of the constant volume incendiary bomb cavity, a plane mirror is provided on the irradiation path of the point light source, a convex lens is provided on the reflection path of the plane mirror, a plane mirror and a convex lens are symmetrically provided on the center of the side of the constant volume incendiary bomb cavity away from the convex lens, the light refraction path between the convex lenses on both sides of the constant volume incendiary bomb cavity passes through the optical windows at both ends of the constant volume incendiary bomb cavity, a Schlieren edge is provided on the refraction path of the plane mirror on the side of the constant volume incendiary bomb cavity away from the point light source, a high-speed camera is provided on the optical path of the side of the Schlieren edge away from the plane mirror, and the high-speed camera is connected to a computer via an acquisition card;

[0008] The computer is connected to the temperature control system by signal, the computer is connected to the injector and the circulation pipe by signal through the regulating controller, the computer is connected to a refrigeration system, the cooling part of the refrigeration system is installed on the constant volume combustion bomb cavity, the computer is connected to the ignition electrode by signal through the ignition system, and the ignition electrode is arranged throughout the constant volume combustion bomb cavity.

[0009] As a preferred embodiment, an air inlet pipe is installed on the constant volume combustion bomb cavity, the air inlet pipe is connected to pressure gauge 1 through a valve group, and the pressure gauge 1 is connected to pressure gauge 2 through a valve group.

[0010] As a preferred embodiment, an injector is provided on one side of the constant volume combustion bomb cavity, and the injector is connected to a storage tank.

[0011] The method for measuring the combustion and explosion characteristics of combustible liquid phase material parameters in a wide temperature range specifically comprises the following steps:

[0012] S1. Prepare a constant volume incendiary bomb cavity: the constant volume incendiary bomb cavity is a sphere made of stainless steel, with an inner diameter of 200 mm. A number of threaded holes are provided on the constant volume incendiary bomb cavity to connect the port sealing structure and the optical window. A pair of ignition electrodes are installed in the center of the constant volume incendiary bomb cavity. The ignition electrodes are connected to the ignition system through wires. The air intake and exhaust system of the constant volume incendiary bomb cavity is connected to the constant volume incendiary bomb cavity through the threaded holes provided on the constant volume incendiary bomb cavity. The air intake and exhaust system includes an air intake pipe, an exhaust pipe, a pressure gauge 1, a pressure gauge 2, a vacuum pump and a plurality of valve groups. The air intake pipe and the exhaust pipe are connected to the constant volume incendiary bomb cavity through the threaded holes provided on the constant volume incendiary bomb cavity. Valves for controlling gas flow are installed on the air intake pipe and the exhaust pipe. An external heating system is installed on the constant volume incendiary bomb cavity. A temperature control system is used for temperature control. The temperature control system includes a temperature sensor. The temperature sensor is installed inside the constant volume incendiary bomb cavity. The temperature sensor is connected to an electromagnetic relay and a PID digital display meter through a wire.

[0013] S2, arrange the Schlieren system;

[0014] S3. Arrange instantaneous pressure collection system;

[0015] S4. Arrange a liquid inlet system: the liquid inlet system includes a fuel inlet system and a refrigerant inlet system;

[0016] S5. Conduct experiments.

[0017] As a preferred embodiment, in step S2, the specific arrangement process of the Schlieren system is as follows: the Schlieren system includes a point light source, a plane mirror, a convex lens, a high-speed camera and a Schlieren knife edge, the plane mirror and the convex lens are both two, the point light source, the plane mirror, the convex lens, the high-speed camera and the Schlieren knife edge are arranged on the same horizontal line as the optical windows opened at both ends of the constant volume incendiary bomb cavity, the point light source is arranged on one side of the optical window, a plane mirror and a convex lens are arranged between the point light source and the optical window, another plane mirror and a convex lens are arranged on the side of the optical window opposite to the point light source, a high-speed camera and a Schlieren knife edge are arranged on one side of the convex lens, the point light source, the plane mirror, the convex lens, the high-speed camera and the Schlieren knife edge limit the light path through an optical guide rail, the point light source is emitted from the first plane mirror to the first convex lens and then becomes parallel light passing through the optical window, converges on the plane mirror after passing through the second convex lens and then emits to the Schlieren knife edge, and then forms an image in the high-speed camera.

[0018] As a preferred implementation, in step S3, the specific arrangement process of the instantaneous pressure acquisition system is as follows: the instantaneous pressure acquisition system includes a high-pressure sensor and an acquisition card, the high-pressure sensor is piezoelectric, the high-pressure sensor is arranged at the top of the constant volume combustion bomb cavity, and is connected to the charge amplifier and the acquisition card through a wire, the high-pressure sensor will generate an electrical signal under the pressure of the explosive gas, which will be amplified by the charge amplifier and then collected by the acquisition card, and finally converted into pressure data for display and output.

[0019] As a preferred embodiment, in step S4, the arrangement process of the fuel intake system is as follows: the fuel intake system includes an injector installed on the constant volume combustion bomb cavity, the injector is connected to the regulating controller through a wire, and the regulating controller is further connected to the computer.

[0020] As a preferred embodiment, in step S4, the arrangement process of the refrigerant inlet system is as follows: the refrigerant inlet system includes a circulation pipe installed on the constant volume combustion bomb cavity, and the computer controls the flow regulating valve connected to the circulation pipe by a wire through a control regulating controller, thereby achieving precise control of the refrigerant flow.

[0021] As a preferred implementation manner, in step S5, the specific experimental steps are: first, the constant volume combustion bomb cavity is evacuated by a vacuum pump, and the fuel and the oxidant are sequentially filled into the constant volume combustion bomb cavity according to the partial pressure ratio, and then the ignition system is used to perform central ignition of the fuel, and the computer is used to simultaneously trigger the schlieren system and the instantaneous pressure acquisition system to capture the flame morphology images and the instantaneous pressure change curves at different times, thereby completing the synchronous measurement experiment of the fuel combustion and explosion characteristics.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are:

[0023] The present invention can realize the measurement of the combustion and explosion characteristics of combustible phase material parameters through the designed intake and exhaust system, and the precise control of the liquid inlet system can study the combustion and explosion characteristics of combustible liquid phase material parameters. At the same time, the flame morphology evolution and the instantaneous pressure accumulation behavior can be synchronously measured through the computer combined with the schlieren system and the instantaneous pressure acquisition system, thereby realizing the measurement of the combustion and explosion characteristics of gas phase material parameters and combustible liquid phase material parameters in the same experimental equipment. At the same time, the temperature control system can also study the test conditions at different initial temperatures, thereby expanding the initial temperature conditions of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention provides a schematic diagram of the structure of a device for measuring the combustion and explosion characteristics of liquid-phase material parameters of combustible gas over a wide temperature range;

[0025] Figure 2This is a schematic diagram of the structure of a constant volume combustion bomb cavity of a device for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas over a wide temperature range proposed by the present invention;

[0026] Figure 3 The present invention proposes a flow chart of a method for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas in a wide temperature range.

[0027] Legend:

[0028] 1. Constant volume incendiary bomb cavity; 2. High pressure sensor; 3. Injector; 4. Circulation pipe; 5. Temperature control system; 6. Thermocouple; 7. Point light source; 8. Plane mirror; 9. Convex lens; 10. Optical window; 11. Intake pipe; 12. Pressure gauge 1; 13. Pressure gauge 2; 14. Ignition system; 15. High-speed camera; 16. Capture card; 17. Computer; 18. Temperature sensor; 19. Vacuum pump; 20. Circulation pump; 21. Ignition electrode; 22. Exhaust pipe; 23. Schlieren knife edge; 24. Adjustment controller; 25. Injector; 26. Storage tank; 27. Refrigeration system; 28. Copper tube. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1-2 As shown, the present invention provides a technical solution: a device and method for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas in a wide temperature range, comprising a constant volume combustion bomb cavity 1, optical windows 10 are installed at both ends of the constant volume combustion bomb cavity 1, a high pressure sensor 2 is installed on the constant volume combustion bomb cavity 1, an injector 3 and a circulation pipe 4 are installed on the constant volume combustion bomb cavity 1 corresponding to one side of the high pressure sensor 2, a thermocouple 6 is installed on the constant volume combustion bomb cavity 1 corresponding to the side of the high pressure sensor 2 away from the injector 3, the thermocouple 6 is connected to a temperature control system 5, a temperature sensor 18 is installed on the shell of the constant volume combustion bomb cavity 1 corresponding to the high pressure sensor 2 and the thermocouple 6, the temperature control system 5 is signal-connected to the high pressure sensor 2 and the temperature sensor 18, two exhaust pipes 22 are provided on the constant volume combustion bomb cavity 1, the exhaust pipe 22 is connected to a vacuum pump 19 through a valve group, the exhaust pipe 22 is connected to a circulation pump 20 through another valve group, and the circulation pump 20 is connected to the other exhaust pipe 22 through the valve group;

[0032] The constant volume combustion bomb cavity 1 is spherical and made of 304 stainless steel, with an inner diameter of 200 mm, and threaded holes are provided on the constant volume combustion bomb cavity 1 corresponding to the high pressure sensor 2, the injector 3, the circulation pipe 4, the thermocouple 6, the air intake pipe 11 and the ignition electrode 21, for connecting the high pressure sensor 2, the injector 3, the circulation pipe 4, the thermocouple 6, the air intake pipe 11 and the ignition electrode 21 with the constant volume combustion bomb cavity 1;

[0033] In addition, an external heating system is installed on the constant volume incendiary bomb cavity 1. The external heating device is made of aluminum, with a thickness of 20 mm, a heating rod, and the filling materials are all environmentally friendly and non-toxic materials. The voltage is 220V, the total power is 3000W, the heating temperature extreme value is 350°C, the temperature fluctuation is ±5°C, and the temperature control system 5 is used for temperature control;

[0034] At the same time, the ejector 25, the storage tank 26, the refrigeration system 27 and the copper tube 28 constitute a cooling device. The ejector 25 is connected to the storage tank 26 through a transmission pipeline. The liquid nitrogen is pressurized by the ejector 25 and then introduced into the constant volume combustion bomb cavity 1 for cooling.

[0035] Further, a point light source 7 is provided on one side of the constant volume incendiary bomb cavity 1, a plane mirror 8 is provided on the irradiation path of the point light source 7, a convex lens 9 is provided on the reflection path of the plane mirror 8, a plane mirror 8 and a convex lens 9 are symmetrically provided on the center of the side of the constant volume incendiary bomb cavity 1 away from the convex lens 9, a light refraction path between the convex lenses 9 on both sides of the constant volume incendiary bomb cavity 1 passes through the optical windows 10 at both ends of the constant volume incendiary bomb cavity 1, a Schlieren edge 23 is provided on the refraction path of the plane mirror 8 on the side of the constant volume incendiary bomb cavity 1 away from the point light source 7, a high-speed camera 15 is provided on the optical path of the Schlieren edge 23 on the side away from the plane mirror 8, and the high-speed camera 15 is connected to a computer 17 via an acquisition card 16;

[0036] The point light source 7, plane mirror 8, convex lens 9, high-speed camera 15 and Schlieren knife edge 23 limit the light path through the optical guide rail. The point light source 7 is transformed into parallel light after being emitted from the first plane mirror 8 to the first convex lens 9, passes through the optical window 10, converges on the plane mirror 8 after passing through the second convex lens 9, and then emits to the Schlieren knife edge 23, and then forms an image in the high-speed camera 15.

[0037] Furthermore, the shooting frequency of the high-speed camera 15 is 0 to 100,000 times per second;

[0038] Furthermore, the computer 17 is connected to the temperature control system 5 by signals, the computer 17 is connected to the injector 3 and the circulation pipe 4 by signals through the regulating controller 24, the computer 17 is connected to the refrigeration system 27, the cooling part of the refrigeration system 27 is installed on the constant volume combustion bomb cavity 1, the computer 17 is connected to the ignition electrode 21 by signals through the ignition system 14, and the ignition electrode 21 is arranged throughout the constant volume combustion bomb cavity 1;

[0039] The computer 17 sets the parameters of the initial trigger signal, injection pulse width and time interval of the fuel injection by controlling the regulating controller 24. The fuel is pressurized by the oil pump through the high-pressure pipeline and then accurately injected into the constant volume combustion bomb for combustion.

[0040] Furthermore, an air intake pipe 11 is installed on the constant volume combustion bomb cavity 1, and the air intake pipe 11 is connected to a pressure gauge 12 through a valve group, and the pressure gauge 12 is connected to a pressure gauge 2 13 through a valve group;

[0041] Furthermore, an injector 25 is provided on one side of the constant volume combustion bomb cavity 1 , and the injector 25 is connected to a storage tank 26 .

[0042] In this embodiment, the Schlieren system composed of a point light source 7, a plane mirror 8, a convex lens 9, a high-speed camera 15, a Schlieren knife edge 23 and supporting components photographs the experimental environment inside the constant volume combustion bomb cavity 1; the instantaneous pressure acquisition system composed of a high-pressure sensor 2, an acquisition card 16 and supporting components detects the instantaneous pressure of the constant volume combustion bomb cavity 1 during the experiment; the fuel supply system composed of the constant volume combustion bomb cavity 1, the injector 3 and supporting components plays a role in providing fuel during the experiment of the constant volume combustion bomb cavity 1; the refrigerant supply system composed of a circulation pipe 4, a computer 17, a regulating controller 24 and supporting components can cool the liquid fuel injected into the constant volume combustion bomb cavity 1; the Schlieren system and the instantaneous pressure acquisition system are used to capture the flame morphology image and the instantaneous pressure change curve of the constant volume combustion bomb cavity 1 at different times during the experiment, thereby completing the synchronous measurement experiment of the fuel combustion and explosion characteristics.

[0043] Example 2

[0044] like Figure 1-3 As shown, the method for measuring the combustion and explosion characteristics of combustible liquid phase material parameters in a wide temperature range specifically includes the following steps:

[0045] S1. Prepare a constant volume incendiary bomb cavity 1: the constant volume incendiary bomb cavity 1 is spherical and made of 304 stainless steel, with an inner diameter of 200 mm. A number of threaded holes are provided on the constant volume incendiary bomb cavity 1 to connect the port sealing structure and the optical window 10. A pair of ignition electrodes 21 are installed in the center of the constant volume incendiary bomb cavity 1, and the ignition electrodes 21 are connected to the ignition system 14 through wires.

[0046] The air intake and exhaust system of the constant volume combustion bomb cavity 1 is connected to the constant volume combustion bomb cavity 1 through a threaded hole provided on the constant volume combustion bomb cavity 1, and the air intake and exhaust system includes an air intake pipe 11, an exhaust pipe 22, a pressure gauge 12, a pressure gauge 2 13, a vacuum pump 19 and a plurality of valve groups. The air intake pipe 11 and the exhaust pipe 22 are connected to the constant volume combustion bomb cavity 1 through a threaded hole provided on the constant volume combustion bomb cavity 1, and valves for controlling gas flow are installed on the air intake pipe 11 and the exhaust pipe 22;

[0047] In addition, an external heating system is installed on the constant volume incendiary bomb cavity 1, and a temperature control system 5 is used for temperature control. The temperature control system 5 includes a temperature sensor 18, which is installed inside the constant volume incendiary bomb cavity 1. The temperature sensor 18 is connected to an electromagnetic relay and a PID digital display meter through a wire;

[0048] In addition, when conducting a combustion and explosion experiment of liquid fuel, the fuel is cooled by a cooling device, which is composed of an injector 25, a storage tank 26, a refrigeration system 27 and a copper tube 28. The injector 25 is connected to the storage tank 26 through a transmission pipeline. Liquid nitrogen is pressurized by the injector 25 and then introduced into the interior of the constant volume combustion bomb cavity 1 to achieve cooling under working conditions below -80°C. The refrigeration system 27 is connected to the computer 17 through a wire, and the signal sent by the computer 17 controls the refrigeration system 27 to achieve precise control of the initial temperature of the experiment from -80°C to room temperature.

[0049] S2. Arrange the Schlieren system: The Schlieren system includes a point light source 7, a plane mirror 8, a convex lens 9, a high-speed camera 15 and a Schlieren knife edge 23. There are two plane mirrors 8 and two convex lenses 9. The point light source 7, the plane mirror 8, the convex lens 9, the high-speed camera 15 and the Schlieren knife edge 23 are arranged on the same horizontal line as the optical windows 10 opened at both ends of the constant volume incendiary bomb cavity 1. The point light source 7 is arranged on one side of the optical window 10. A plane mirror 8 and a convex lens 9 are arranged between the point light source 7 and the optical window 10. The point light source 7 is opposite to the optical window 10. Another plane mirror 8 and a convex lens 9 are arranged on one side of the optical window 10, and a high-speed camera 15 and a Schlieren knife edge 23 are arranged on one side of the convex lens 9. The point light source 7, the plane mirror 8, the convex lens 9, the high-speed camera 15 and the Schlieren knife edge 23 limit the light path through the optical guide rail. The point light source 7 is converted into parallel light after being emitted from the first plane mirror 8 to the first convex lens 9, passes through the optical window 10, converges on the plane mirror 8 after passing through the second convex lens 9, and then emits to the Schlieren knife edge 23, and then forms an image in the high-speed camera 15;

[0050] S3. Arrange an instantaneous pressure acquisition system: The instantaneous pressure acquisition system includes a high-pressure sensor 2 and an acquisition card 16. The high-pressure sensor 2 is a piezoelectric type. The high-pressure sensor 2 is arranged at the top of the constant volume combustion bomb cavity 1 and is connected to the charge amplifier and the acquisition card 16 through a wire. The high-pressure sensor 2 generates an electrical signal under the pressure of the explosive gas, which is amplified by the charge amplifier and then collected by the acquisition card 16, and finally converted into pressure data for display and output;

[0051] S4. Arrange a liquid inlet system: the liquid inlet system includes a fuel inlet system and a refrigerant inlet system;

[0052] The fuel inlet system includes an injector 3 installed on the constant volume combustion bomb cavity 1, the injector 3 is connected to the regulating controller 24 through a wire, and the regulating controller 24 is further connected to the computer 17;

[0053] Furthermore, the refrigerant inlet system includes a circulation pipe 4 installed on the constant volume combustion bomb cavity 1, and the computer 17 controls the flow regulating valve connected to the refrigerant through a wire by controlling the regulating controller 24, thereby realizing accurate control of the refrigerant flow;

[0054] S5, conduct the experiment: first, evacuate the constant volume combustion bomb cavity 1 by the vacuum pump 19, and sequentially fill the constant volume combustion bomb cavity 1 with fuel and oxidant according to the partial pressure ratio, and then use the ignition system 14 to perform central ignition on the fuel, and use the computer 17 to simultaneously trigger the schlieren system and the instantaneous pressure acquisition system to capture the flame morphology images and instantaneous pressure change curves at different times, thereby completing the synchronous measurement experiment of the fuel combustion and explosion characteristics;

[0055] Among them, fuel types include combustible gases and combustible liquids.

[0056] In this embodiment, firstly, a fuel inlet system of a constant volume combustion bomb cavity is designed according to the physical state of the fuel. When conducting experiments, different methods of filling the fuel are selected according to the physical state of the experimental material, and the deflagration state inside the constant volume combustion bomb cavity 1 can be detected by combining the designed schlieren system with the optical window 10. At the same time, the instantaneous pressure change data inside the constant volume combustion bomb cavity 1 under the deflagration experiment is collected by the designed instantaneous pressure acquisition system, thereby realizing a synchronous measurement experiment of the combustion and explosion characteristics of the fuel;

[0057] In addition, when conducting experiments on liquid explosion test materials, the cooling device can stabilize the physical state of the fuel and reduce the deviation of the experimental results caused by the temperature difference caused by the injection of the fuel.

[0058] Working principle:

[0059] like Figure 1-3 As shown, the present invention realizes the measurement of the combustion and explosion characteristics of gas phase material parameters and combustible liquid phase material parameters in the same experimental equipment. At the same time, the temperature control system can also study the test conditions under different initial temperatures, expanding the initial temperature conditions of the experiment; the measurement of the combustion and explosion characteristics of the combustible phase material parameters can be realized through the intake and exhaust system; the combustion and explosion characteristics of the combustible liquid phase material parameters can be studied through the precise control of the liquid inlet system; the flame morphology evolution and the instantaneous pressure accumulation behavior can be synchronously measured through the computer 17 combined with the schlieren system and the instantaneous pressure acquisition system.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A device for measuring the combustion and explosion characteristics of combustible liquid phase material parameters in a wide temperature range, characterized by: The invention comprises a constant volume combustion bomb cavity (1), optical windows (10) are installed at both ends of the constant volume combustion bomb cavity (1), a high pressure sensor (2) is installed on the constant volume combustion bomb cavity (1), a fuel injector (3) and a circulation pipe (4) are installed on the constant volume combustion bomb cavity (1) corresponding to one side of the high pressure sensor (2), a thermocouple (6) is installed on the constant volume combustion bomb cavity (1) corresponding to the side of the high pressure sensor (2) away from the fuel injector (3), the thermocouple (6) is connected to a temperature control system (5), and the high pressure sensor (2) is connected to the constant volume combustion bomb cavity (1) corresponding to the side of the high pressure sensor (2) away from the fuel injector (3). A temperature sensor (18) is installed on the outer shell of the constant volume combustion bomb cavity (1) corresponding to the thermocouple (2) and the thermocouple (6); the temperature control system (5) is signal-connected to the high pressure sensor (2) and the temperature sensor (18); two exhaust pipes (22) are provided on the constant volume combustion bomb cavity (1); the exhaust pipes (22) are connected to a vacuum pump (19) through a valve group; the exhaust pipes (22) are connected to a circulation pump (20) through another valve group; and the circulation pump (20) is communicated with the other exhaust pipe (22) through the valve group; A point light source (7) is provided on one side of the constant volume incendiary bomb cavity (1), a plane mirror (8) is provided on the irradiation path of the point light source (7), a convex lens (9) is provided on the reflection path of the plane mirror (8), a plane mirror (8) and a convex lens (9) are symmetrically provided on the center of the side of the constant volume incendiary bomb cavity (1) away from the convex lens (9), a light refraction path between the convex lenses (9) on both sides of the constant volume incendiary bomb cavity (1) passes through the optical windows (10) at both ends of the constant volume incendiary bomb cavity (1), a Schlieren knife edge (23) is provided on the refraction path of the plane mirror (8) on the side of the constant volume incendiary bomb cavity (1) away from the point light source (7), a high-speed camera (15) is provided on the optical path of the side of the Schlieren knife edge (23) away from the plane mirror (8), and the high-speed camera (15) is connected to a computer (17) via an acquisition card (16); The computer (17) is connected to the temperature control system (5) by signal. The computer (17) is connected to the injector (3) and the circulation pipe (4) by signal through the regulating controller (24). The computer (17) is connected to a refrigeration system (27). The cooling part of the refrigeration system (27) is installed on the constant volume combustion bomb cavity (1). The computer (17) is connected to the ignition electrode (21) by signal through the ignition system (14). The ignition electrode (21) is arranged to penetrate the constant volume combustion bomb cavity (1).

2. The device for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas over a wide temperature range according to claim 1, characterized in that: An air intake pipe (11) is installed on the constant volume combustion bomb cavity (1), the air intake pipe (11) is connected to a pressure gauge 1 (12) through a valve group, and the pressure gauge 1 (12) is connected to a pressure gauge 2 (13) through a valve group.

3. The device for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas over a wide temperature range according to claim 2, characterized in that: An injector (25) is provided on one side of the constant volume combustion bomb cavity (1), and the injector (25) is connected to a storage tank (26).

4. A method for measuring the combustion and explosion characteristics of liquid phase material parameters of flammable gas in a wide temperature range, according to the device for measuring the combustion and explosion characteristics of liquid phase material parameters of flammable gas in a wide temperature range according to any one of claims 1 to 3, characterized in that: The specific steps include: S1. Prepare a constant volume incendiary bomb cavity (1): the constant volume incendiary bomb cavity (1) is spherical and made of 304 stainless steel, and the inner diameter of the cavity is 200 mm. A number of threaded holes are provided on the constant volume incendiary bomb cavity (1) to connect the port sealing structure and the optical window (10). A pair of ignition electrodes (21) are installed in the center of the constant volume incendiary bomb cavity (1). The ignition electrodes (21) are connected to the ignition system (14) through wires. The intake and exhaust system of the constant volume incendiary bomb cavity (1) is connected to the constant volume incendiary bomb cavity (1) through the threaded holes provided on the constant volume incendiary bomb cavity (1). The intake and exhaust system includes an intake pipe (11), an exhaust pipe (22), a pressure gauge (14), and a pressure gauge (15). 2), a pressure gauge (13), a vacuum pump (19) and a plurality of valve groups, the air intake pipe (11) and the exhaust pipe (22) are connected to the constant volume incendiary bomb cavity (1) through threaded holes provided on the constant volume incendiary bomb cavity (1), the air intake pipe (11) and the exhaust pipe (22) are both provided with valves for controlling the flow of gas, the constant volume incendiary bomb cavity (1) is provided with an external heating system, and a temperature control system (5) is used for temperature control, the temperature control system (5) comprises a temperature sensor (18), the temperature sensor (18) is installed inside the constant volume incendiary bomb cavity (1), and the temperature sensor (18) is connected to an electromagnetic relay and a PID digital display meter through a wire; S2, arrange the Schlieren system; S3. Arrange instantaneous pressure collection system; S4. Arrange a liquid inlet system: the liquid inlet system includes a fuel inlet system and a refrigerant inlet system; S5. Conduct experiments.

5. The device for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas over a wide temperature range according to claim 1, characterized in that: In step S2, the specific arrangement process of the Schlieren system is as follows: the Schlieren system comprises a point light source (7), a plane mirror (8), a convex lens (9), a high-speed camera (15) and a Schlieren knife edge (23), the plane mirror (8) and the convex lens (9) are both two, the point light source (7), the plane mirror (8), the convex lens (9), the high-speed camera (15) and the Schlieren knife edge (23) are arranged on the same horizontal line as the optical windows (10) opened at both ends of the constant volume incendiary bomb cavity (1), the point light source (7) is arranged on one side of the optical window (10), and a plane mirror (8) and a convex lens (9) are arranged between the point light source (7) and the optical window (10), Another plane mirror (8) and a convex lens (9) are arranged on one side of the optical window (10) opposite to the point light source (7); a high-speed camera (15) and a Schlieren knife edge (23) are arranged on one side of the convex lens (9); the point light source (7), the plane mirror (8), the convex lens (9), the high-speed camera (15) and the Schlieren knife edge (23) limit the light path through an optical guide rail; the point light source (7) is emitted from the first plane mirror (8) to the first convex lens (9) and then becomes parallel light, passes through the optical window (10), and after passing through the second convex lens (9), converges on the plane mirror (8) and then emits to the Schlieren knife edge (23), and then forms an image in the high-speed camera (15).

6. The device for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas over a wide temperature range according to claim 1, characterized in that: In step S3, the specific arrangement process of the instantaneous pressure acquisition system is as follows: the instantaneous pressure acquisition system comprises a high-pressure sensor (2) and an acquisition card (16); the high-pressure sensor (2) is of a piezoelectric type; the high-pressure sensor (2) is arranged at the top of the constant-volume combustion bomb cavity (1) and is connected to the charge amplifier and the acquisition card (16) via a wire; the high-pressure sensor (2) generates an electrical signal under the pressure of the explosive gas, which is amplified by the charge amplifier and then acquired by the acquisition card (16) and finally converted into pressure data for display and output.

7. The method for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas in a wide temperature range according to claim 6, characterized in that: In step S4, the arrangement process of the fuel intake system is as follows: the fuel intake system includes an injector (3) installed on the constant volume combustion bomb cavity (1), the injector (3) is connected to the regulating controller (24) through a wire, and the regulating controller (24) is further connected to the computer (17).

8. The method for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas in a wide temperature range according to claim 1, characterized in that: In step S4, the arrangement process of the refrigerant inlet system is as follows: the refrigerant inlet system includes a circulation pipe (4) installed on the constant volume combustion bomb cavity (1), and the computer (17) controls the flow regulating valve connected to the refrigerant by a wire by controlling the regulating controller (24), thereby achieving precise control of the refrigerant flow.

9. The method for measuring the combustion and explosion characteristics of liquid phase material parameters of combustible gas in a wide temperature range according to claim 1, characterized in that: In step S5, the specific experimental steps are: first, the constant volume combustion bomb cavity (1) is evacuated by a vacuum pump (19), and fuel and oxidant are sequentially charged into the constant volume combustion bomb cavity (1) according to the partial pressure ratio, and then the fuel is centrally ignited by the ignition system (14), and the computer (17) is used to simultaneously trigger the schlieren system and the instantaneous pressure acquisition system to capture the flame shape images and the instantaneous pressure change curves at different times, thereby completing the synchronous measurement experiment of the fuel combustion and explosion characteristics.

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