Microscopic Metal Particle Combustion Test Device

Abstract

This application relates to the field of aerospace technology, and particularly to a combustion test device for metal particles under a microscope. The combustion test device for metal particles under a microscope includes an optical microscopy component, a combustion test component, an oxidant pressurization component, and an observation component; the optical microscopy component can ignite metal particles and measure the energy for igniting the metal particles; the combustion test component can provide a combustion condition with pressure for the metal particles; the oxidant pressurization component can supply an oxidant with adjustable pressure to the combustion test component; the observation component can capture the combustion process of the metal particles to obtain the ignition delay time, combustion time, and visible light images during the combustion process of the metal particles. This application can overcome the problem in the prior art that the observation scale cannot be reduced to the level of dozens of micrometers and nanometers; at the same time, it can meet the precise control of the combustion environment components, pressure, and ignition energy.

Description

Technical Field

[0001] This application relates to the field of aerospace technology, and particularly to an experimental device for the combustion of metal particles under a microscope. Background Art

[0002] In recent years, hypersonic flight technology has become the main battlefield for the competition in the near space of major aerospace countries. Along with a series of advancements in air-breathing hypersonic propulsion technology by humans, people have started to aim at higher flight speeds above 10 Ma. However, the higher speed causes the air temperature entering the combustion chamber to be as high as above 2500 K, which causes most of the fuel to dissociate, thus failing to release sufficient heat for heating. This results in the fact that the aircraft cannot obtain sufficient thrust at higher flight Mach numbers, so higher requirements are put forward for the energy characteristics of the fuel. Compared with hydrocarbon fuels, metal powder fuels have a higher volume calorific value, and solid particles are not easily dissociated in a high-temperature oncoming flow, making them more suitable for application at extremely high Mach numbers.

[0003] At present, people already have a preliminary understanding of metal powder fuels such as magnesium and aluminum. However, due to limited observation means, only single particles with a size of hundreds of micrometers and above can be observed in detail optically. When the particle size is reduced to dozens of micrometers or even hundreds of nanometers, the observation effect is not satisfactory. And the combustion efficiency of particles will increase significantly as the particle size decreases. Therefore, more and more research in engines has started to use metal powder particles with sizes of dozens of micrometers and sub-micrometers. This requires that the basic research scale for particle combustion should also reach the same level.

[0004] At present, the most common solution is to install a microscopic lens on a camera for single-particle observation. However, the optical magnification of this method is limited, and the maximum can reach the level of dozens of micrometers. To further improve the observation fineness of particles, a solution using a microscope for observation has also emerged. In this solution, the metal particles are placed on a stage, and a coaxial microscope is used to introduce a laser into the optical path to achieve ignition of the particles, and at the same time, the combustion of the metal particles is observed from another path. This method can bring the observation scale of the particles to the sub-micrometer level.

[0005] However, the above - mentioned scheme is still in the initial exploration stage and has the following obvious defects. First: In the scheme of laser ignition, since the ignition energy has a certain impact on the combustion characteristics of particles, and in the current scheme, there is a lack of monitoring of the laser output power to adjust different ignition energies. Second: The existing scheme is studied under normal - pressure environment, which is significantly different from the actual working pressure in the engine combustion chamber. Since the higher the combustion - environment pressure, the ignition delay and combustion time will be significantly shortened, especially for nano - scale particles. Therefore, it is further necessary to build a test device to study the combustion characteristics under different combustion - environment pressures. In addition, the current research scheme can only conduct optical observations during the particle combustion process, but lacks research devices for more important parameters such as combustion temperature and product generation during the combustion process. Finally: In the current device, the dispersion of particles completely relies on manually oscillating the test carrier platform, but this method is difficult to completely separate tiny particles into non - interfering regions during combustion, resulting in the "single - particle combustion" still being affected by the surrounding particle group.

[0006] Therefore, there is an urgent need for a metal - particle combustion test device under a microscope to solve the technical problems existing in the prior art to a certain extent. Summary of the Invention

[0007] The object of the present invention is to provide a metal - particle combustion test device under a microscope (a test device for studying the combustion characteristics of sub - micron - scale metal single particles), to overcome the technical problem in the prior art that the observation scale cannot be reduced to the level of dozens of microns and nanometers, and at the same time to be able to meet the precise control of the combustion - environment components, pressure, and ignition energy.

[0008] The present application provides a metal - particle combustion test device under a microscope, including an optical microscopy component, a combustion test component, an oxidant pressurization component, and an observation component;

[0009] The optical microscopy component can ignite the metal particles and measure the energy of the metal - particle ignition;

[0010] The combustion test component can provide a combustion condition with pressure for the metal particles;

[0011] The oxidant pressurization component can provide an oxidant with adjustable pressure to the combustion test component;

[0012] The observation component can photograph the combustion process of the metal particles to obtain the ignition delay, combustion time, and visible - light images during the combustion of the metal particles.

[0013] In the above - mentioned technical solution, further, the optical microscopy component includes a lens barrel, an eyepiece lens barrel, an objective lens, an ignition source, a laser power meter, a dichroic mirror, a dichroic beam splitter, and a beam splitter;

[0014] The lens barrel is vertically connected to the eyepiece lens barrel, and the beam splitter is disposed at the intersection of the lens barrel and the eyepiece lens barrel;

[0015] The ignition source is vertically connected to the lens barrel through a first conduction channel, the dichroic mirror is disposed in the first conduction channel, and the axis of the dichroic mirror is disposed at an angle of 45° with the axis of the first conduction channel;

[0016] The dichroic mirror is disposed at the intersection of the first conduction channel and the lens barrel, and the dichroic mirror is parallel to the beam splitter; the objective lens is disposed at one end of the lens barrel close to the combustion test assembly;

[0017] The laser power meter is perpendicular to the first conduction channel through a second conduction channel, and the laser power meter corresponds to the beam splitter.

[0018] In the above technical solution, further, the optical microscopy assembly further includes a photomultiplier tube disposed at one end of the lens barrel away from the combustion test assembly;

[0019] There are two photomultiplier tubes, one of the photomultiplier tubes is provided with a filter with a wavelength of 600.5 nm, and the other photomultiplier tube is provided with a filter with a wavelength of 631.5 nm.

[0020] In the above technical solution, further, the combustion test assembly includes a combustion chamber, a fixed outer frame, a power supply, an adjustable screw, a conductive glass bracket, a calcium fluoride optical window glass, and a conductive glass;

[0021] The combustion chamber is communicated with the oxidant pressurization assembly, and the oxidant pressurization assembly can introduce an oxidant into the combustion chamber;

[0022] The fixed outer frame is disposed above the combustion chamber, and the calcium fluoride optical window glass is disposed within the fixed outer frame;

[0023] The conductive glass bracket is disposed within the combustion chamber and close to the fixed outer frame; the conductive glass surrounds an installation space, and the conductive glass is disposed within the installation space;

[0024] One end of the adjustable screw is electrically connected to the power supply and the other end is electrically connected to the conductive glass bracket;

[0025] A receiving cavity is formed between the conductive glass and the fixed outer frame, and the receiving cavity is used to prevent metal particles.

[0026] In the above technical solution, further, the oxidant pressurization assembly includes a storage tank, a pressure regulating member, and a flow solenoid valve;

[0027] There are 3 storage tanks, and the 3 storage tanks are used to store different gases;

[0028] The storage tanks are connected to the manifold through output pipes, and the flow solenoid valve is arranged on the output pipes; the output end of the manifold is connected to the pressure regulating component.

[0029] In the above technical solution, further, the pressure regulating component includes an extrusion tank, a piston arranged in the extrusion tank, and a motor connected to the piston;

[0030] The output end of the manifold is connected to the extrusion tank;

[0031] The motor drives the piston to act on the mixed gas in the extrusion tank to increase the air pressure of the mixed gas in the extrusion tank.

[0032] In the above technical solution, further, the observation component includes a camera arranged at the end of the eyepiece barrel;

[0033] The camera can capture the light emitted by the combustion of the metal particles that sequentially passes through the objective lens, the dichroic mirror, and the spectroscope, so as to obtain the ignition delay, combustion time, and visible light image during the combustion process when the metal particles burn.

[0034] In the above technical solution, further, a spectral analyzer is also included. The spectral analyzer is arranged between the objective lens and the combustion test component, and the spectral analyzer can obtain the components of the combustion products during the combustion process of the metal particles.

[0035] In the above technical solution, further, the combustion test component further includes an ultraviolet lamp, and the ultraviolet lamp acts as a light source.

[0036] In the above technical solution, further, the ignition source is a 532nm YAG laser or a 1064nm laser or a carbon dioxide laser.

[0037] Compared with the prior art, the beneficial effects of this application are:

[0038] This application provides a device for burning metal particles under a microscope, including an optical microscopy component, a combustion test component, an oxidant pressurization component, and an observation component;

[0039] The optical microscopy component can ignite the metal particles and measure the energy of the ignition;

[0040] The combustion test component can provide a combustion condition with pressure for the metal particles;

[0041] The oxidant pressurization component can provide an oxidant with adjustable pressure to the combustion test component;

[0042] The observation component can capture the combustion process of the metal particles to obtain the ignition delay, combustion time, and visible light images during the combustion process of the metal particles.

[0043] In summary, the test device for studying the combustion characteristics of sub-micron metal single particles according to the present application can overcome the problem in the prior art that the observation scale cannot be reduced to the level of dozens of microns and nanometers; at the same time, it can meet the precise control of the combustion environment components, pressure, and ignition energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 It is a schematic structural diagram of the metal particle combustion test device under a microscope provided by the present application;

[0046] Figure 2 It is a schematic structural diagram of the ignition optical path in the metal particle combustion test device under a microscope provided by the present application;

[0047] Figure 3 It is a schematic structural diagram of the combustion test component in the metal particle combustion test device under a microscope provided by the present application;

[0048] Figure 4 It is a schematic structural diagram of the extrusion tank in the metal particle combustion test device under a microscope provided by the present application.

[0049] REFERENCE SIGNS:

[0050] 1 - Photomultiplier tube; 2 - Eyepiece tube; 3 - Camera; 4 - Dichroic mirror; 5 - Extrusion tank; 6 - Flow control valve; 9 - Combustion test component; 10 - Ultraviolet lamp; 11 - Bleed valve; 12 - Spectral analyzer; 13 - Objective lens; 14 - Laser power meter; 15 - Laser; 16 - Dichroic mirror; 17 - Tube; 18 - Beam splitter; 19 - Fixed outer frame; 20 - Combustion chamber mixing chamber inlet; 21 - Power supply; 22 - Adjustable screw; 23 - Combustion chamber mixing chamber outlet; 24 - Conductive glass support; 25 - Calcium fluoride optical window glass; 26 - Metal particle; 27 - Conductive glass; 28 - Mixing gas pipeline; 29 - Mixing chamber; 30 - Extrusion tank outlet; 31 - Piston; 32 - Motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0052] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application.

[0053] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0054] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0055] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0056] Combined with Figures 1 - 4 as shown, the combustion experiment device for metal particles 26 under a microscope provided by the present application will be specifically described.

[0057] A combustion test device for metal particles 26 under a microscope provided by the present application, combined with Figure 1As shown, the combustion test device for metal particles 26 under a microscope includes an optical microscopy component, a combustion test component 9, an oxidant pressurization component, and an observation component. Among them, the optical microscopy component can ignite the metal particles 26 and measure the energy of the ignition. Among them, the combustion test component 9 can provide a combustion condition with pressure for the metal particles 26. Among them, the oxidant pressurization component can supply an oxidant with adjustable pressure to the combustion test component 9. Among them, the observation component can photograph the combustion process of the metal particles 26 to obtain the ignition delay, combustion time, and visible light images during the combustion process of the metal particles 26.

[0058] In this embodiment, the optical microscopy component includes a lens barrel 17, an eyepiece lens barrel 2, an objective lens 13, an ignition source, a laser power meter 14, a dichroic mirror 16, a dichroic prism 4, and a beam splitter 18. The lens barrel 17 is vertically connected to the eyepiece lens barrel 2, and the beam splitter 18 is arranged at the intersection of the lens barrel 17 and the eyepiece lens barrel 2. The ignition source is vertically connected to the lens barrel 17 through a first conduction channel, the dichroic mirror 16 is arranged in the first conduction channel, and the axis of the dichroic mirror 16 is arranged at 45° to the axis of the first conduction channel. The dichroic prism 4 is arranged at the intersection of the first conduction channel and the lens barrel 17, and the dichroic mirror 16 is arranged parallel to the beam splitter 18. The objective lens 13 is arranged at one end of the lens barrel 17 close to the combustion test component 9. The laser power meter 14 is perpendicular to the first conduction channel through a second conduction channel, and the laser power meter 14 corresponds to the beam splitter 18.

[0059] Specifically, the ignition source is a 532nm YAG laser 15 or a 1064nm laser 15 or a carbon dioxide laser 15.

[0060] Preferably, the objective lens 13 is a 50x planachromatic metallographic objective lens 13 with a focal length of 3.6mm.

[0061] During actual use, after the 532nm YAG laser 15 emits laser light and passes through the dichroic mirror 16, the optical path is divided into two paths. One path continues along the central axis of the lens barrel 17 to reach the dichroic prism 4, and the other path of the optical path is emitted to the laser power meter 14. Since the laser energy is evenly divided after passing through the dichroic mirror 16, the laser energy used for ignition can be measured by the laser power meter 14, and thus the required ignition energy can be fed back through the power meter.

[0062] Furthermore, the laser reaching the dichroic prism 4 will turn 90°; combined with Figure 2As shown, since the dichroic mirror 4 reflects only for a specific wavelength range, it can ensure that the laser will not pass through it and enter other positions such as the eyepiece. The laser reflected by the dichroic mirror 4 placed at 45° will enter the 50x plan achromatic metallurgical objective lens 13 with a focal length of 3.6 mm and be focused at the focal position of the objective lens 13. At this time, by adjusting the combustion test assembly 9 to the focal position of the objective lens 13, the function of igniting the metal particles 26 can be achieved. The light emitted by the combustion of the metal particles 26 then passes upward through the objective lens 13 and the dichroic mirror 4 to reach the beam splitter 18 and is divided into two beams of light.

[0063] One beam of light is received by the observation assembly after passing through the eyepiece barrel 2, and is used to photograph the combustion process of the metal particles 26 to obtain information such as the ignition delay, combustion time, and visible light image during combustion of the metal particles 26; the other beam of light is captured by the optical microscopy assembly.

[0064] In this embodiment, the optical microscopy assembly further includes a photomultiplier tube 1 and a spectral analyzer 12; the photomultiplier tube 1 is disposed at one end of the barrel 17 away from the combustion test assembly 9, and the spectral analyzer 12 is disposed between the objective lens 13 and the combustion test assembly 9. The spectral analyzer 12 can obtain the components of the combustion products during the combustion process of the metal particles 26.

[0065] Specifically, two photomultiplier tubes 1 are provided. One of the photomultiplier tubes 1 is provided with a filter with a wavelength of 600.5 nm, and the other photomultiplier tube 1 is provided with a filter with a wavelength of 631.5 nm. The filter with a wavelength of 600.5 nm and the filter with a wavelength of 631.5 nm can observe the signal intensities at these two wavelengths, so that real-time temperature measurement can be performed on the combustion process of the metal particles 26 based on the two-color pyrometry method.

[0066] Specifically, the spectral analyzer 12 can obtain the information on the components of the combustion products during the particle combustion process.

[0067] Preferably, the spectral analyzer 12 is a 0.8 nm high-resolution spectrometer.

[0068] In this embodiment, the combustion test assembly 9 includes a combustion chamber, a fixed outer frame 19, a power supply 21, an adjustable screw, a conductive glass support 24, a calcium fluoride optical window glass 25, a conductive glass 27, and a ultraviolet lamp 10. Among them, the combustion chamber is communicated with an oxidant pressurization assembly, and the oxidant pressurization assembly can introduce an oxidant into the combustion chamber. The fixed outer frame 19 is arranged above the combustion chamber, and the calcium fluoride optical window glass 25 is arranged within the fixed outer frame 19. Among them, the conductive glass support 24 is arranged inside the combustion chamber and close to the fixed outer frame 19. The conductive glass 27 surrounds an installation space, and the conductive glass 27 is arranged within the installation space. One end of the adjustable screw is electrically connected to the power supply 21 and the other end is electrically connected to the conductive glass support 24. An accommodation cavity is formed between the conductive glass 27 and the fixed outer frame 19, and the accommodation cavity is used to prevent metal particles 26.

[0069] Specifically, the combustion test assembly 9 can provide a pressurized combustion environment and can disperse micron or nanoscale particles. More specifically, the mixed gas coming out of the oxidant pressurization assembly enters the combustion chamber through the combustion chamber mixing cavity inlet 20. At this time, by adjusting the adjustable screw 22 (the adjustable screw 22 is made of metal), the metal particles 26 are clamped between the conductive glass 27 and the calcium fluoride optical window glass 25 to prevent the metal particles 26 from being carried away by the air flow when adjusting the pressure of the mixed gas. The mixed gas can be discharged after passing through the bleed valve 11 from the combustion chamber mixing cavity outlet 23, and the mutual cooperation of the bleed valve 11, the piston 31 and the motor 32 in the oxidant pressurization assembly can accurately adjust the combustion chamber environmental pressure to the designed pressure.

[0070] Further, the diameter of the calcium fluoride optical window glass 25 is 20 mm, the thickness is 2 mm, the optical window diameter is 10 mm, the size of the conductive glass 27 is the same as that of the calcium fluoride optical window glass 25, and the distance from its upper surface to the upper surface of the calcium fluoride optical window glass 25 is 3 mm. The inner diameter of the combustion chamber mixing cavity inlet 20 is 4 mm.

[0071] During the actual use process, after the oxidant pressurization assembly adjusts the pressure, the positive pole of the power supply 21 is connected to the metal adjustable screw 22 and transmitted to the conductive glass support 24 through it, so that the metal particles 26 on the conductive glass 27 are attached with positive charges. Using the principle that like-polarity charges repel each other, these micron and nanoscale particles are dispersed to ensure that the particles exist independently.

[0072] It should be noted that: Since a common optical microscope uses a common visible light LED as the light source, and the optical resolution is directly related to the light wavelength, its resolution limit is 0.2 um. In order to improve its optical resolution, a 365 nm ultraviolet lamp 10 can be used as the microscope light source.

[0073] In this embodiment, the oxidant pressurization assembly includes a storage tank, a pressure regulating member, and a flow solenoid valve. Specifically, there are 3 storage tanks, and the 3 storage tanks are used to store different gases. For example, oxygen, nitrogen, and argon are stored respectively; or carbon dioxide, water vapor, and nitrogen are stored respectively. Specifically, the storage tanks are connected to the manifold through output pipes, and the flow solenoid valve is arranged on the output pipe. The output end of the manifold is connected to the pressure regulating member. Further, the pressure regulating member includes an extrusion tank 5, a piston 31 arranged in the extrusion tank 5, and a motor 32 connected to the piston 31. The output end of the manifold is communicated with the extrusion tank 5. The motor 32 drives the piston 31 to act on the mixed gas in the extrusion tank 5 to increase the air pressure of the mixed gas in the extrusion tank 5.

[0074] During the actual use process, the mixed gas enters the gas mixing chamber 29 of the extrusion tank 5 through the mixing gas pipeline 28. By controlling the motor 32, the piston 31 can be driven to extrude the gas to achieve the pressurization effect. In this application, the gas pressure is designed to be 1 to 5 atmospheres. The outlet 30 of the extrusion tank is connected to the inlet 20 of the combustion chamber mixing chamber.

[0075] In this embodiment, the observation assembly includes a camera 3 arranged at the end of the eyepiece barrel 2. The camera 3 can capture the light emitted by the combustion of the metal particles 26 that sequentially passes through the objective lens 13, the dichroic mirror 4, and the spectroscope 18, so as to obtain the ignition delay, combustion time, and visible light image during the combustion process when the metal particles 26 burn.

[0076] In summary, this application can provide an oxidant atmosphere with precisely controllable component ratios and pressures for the combustion tests of micron- and nanoscale metal particles 26, and at the same time, it can realize the optical observation of a higher-resolution single-particle metal fuel combustion field. This function is mainly based on the observation imaging method under the microscope. At the same time, each component uses a precision flow control valve 6 to ensure the accuracy of the mixed gas ratio, and the extrusion-type mixing chamber 29 cooperates with the air release valve 11 to precisely adjust the pressure in the micro combustion chamber.

[0077] Secondly, in the micro combustion chamber, a method of discretizing the same charge attached to the particles is adopted to overcome the problem that nanoscale particles are prone to agglomeration, which affects single-particle combustion.

[0078] In addition, in this application, a set of photomultiplier tubes and spectrometers based on double colorimetry are also introduced, so that in the same test, the ignition delay, combustion time, combustion temperature, and combustion products of the metal particles 26 can be measured in real time, and high-resolution optical images can be obtained through a high-speed camera.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A combustion test device for metal particles under a microscope, characterized in that It includes an optical microscopy component, a combustion test component, an oxidant pressurization component, and an observation component; The optical microscopy component can ignite the metal particles and measure the energy for the ignition of the metal particles; The combustion test component can provide a combustion condition with pressure for the metal particles; The oxidant pressurization component can supply an oxidant with adjustable pressure to the combustion test component; The observation component can capture the combustion process of the metal particles to obtain the ignition delay time, combustion time, and visible light images during the combustion process of the metal particles; The optical microscopy component includes a lens barrel, an eyepiece lens barrel, an objective lens, an ignition source, a laser power meter, a dichroic mirror, a dichroic prism, and a beam splitter; The lens barrel is vertically connected to the eyepiece lens barrel, and the beam splitter is arranged at the intersection of the lens barrel and the eyepiece lens barrel; The ignition source is vertically connected to the lens barrel through a first conduction channel, the dichroic mirror is arranged in the first conduction channel, and the axis of the dichroic mirror is set at 45° to the axis of the first conduction channel; The dichroic prism is arranged at the intersection of the first conduction channel and the lens barrel, and the dichroic mirror is arranged parallel to the beam splitter; the objective lens is arranged at one end of the lens barrel close to the combustion test component; The laser power meter is perpendicular to the first conduction channel through a second conduction channel, and the laser power meter corresponds to the beam splitter; The optical microscopy component further includes a photomultiplier tube arranged at one end of the lens barrel away from the combustion test component; There are two photomultiplier tubes, one of the photomultiplier tubes is provided with a filter with a wavelength of 600.5 nm, and the other photomultiplier tube is provided with a filter with a wavelength of 631.5 nm; The combustion test component includes a combustion chamber, a fixed outer frame, a power supply, an adjustable screw, a conductive glass support, a calcium fluoride optical window glass, and a conductive glass; The combustion chamber is connected to the oxidant pressurization component, and the oxidant pressurization component can introduce an oxidant into the combustion chamber; The fixed outer frame is arranged above the combustion chamber, and the calcium fluoride optical window glass is arranged inside the fixed outer frame; The conductive glass support is arranged inside the combustion chamber and close to the fixed outer frame; the conductive glass surrounds an installation space, and the conductive glass is arranged inside the installation space; One end of the adjustable screw is electrically connected to the power supply and the other end is electrically connected to the conductive glass support; An accommodation cavity is formed between the conductive glass and the fixed outer frame, and the accommodation cavity is used to place metal particles.

2. The microscopic metal particle combustion test device according to claim 1, wherein The oxidant pressurization component includes a storage tank, a pressure regulating member, and a flow solenoid valve; There are 3 storage tanks, and the 3 storage tanks are used to store different gases; The storage tank is connected to a manifold through an output pipe, and the flow solenoid valve is arranged on the output pipe; the output end of the manifold is connected to the pressure regulating member.

3. The microscopic metal particle combustion test device according to claim 2, characterized in that, The pressure regulating member includes an extrusion tank, a piston arranged in the extrusion tank, and a motor connected to the piston; The output end of the manifold is connected to the extrusion tank; The motor drives the piston to act on the mixed gas in the extrusion tank to increase the air pressure of the mixed gas in the extrusion tank.

4. The microscopic metal particle combustion test device according to claim 1, characterized in that, The observation assembly includes a camera disposed at the end of the eyepiece barrel; The camera is capable of capturing the light emitted by the combustion of the metal particles that sequentially passes through the objective lens, the dichroic mirror, and the spectroscope, so as to obtain the ignition delay time, the combustion time, and the visible light image during the combustion process of the metal particles.

5. The microscopic metal particle combustion test device according to claim 1, characterized in that, The optical microscopy assembly further includes a spectral analyzer, the spectral analyzer is disposed between the objective lens and the combustion test assembly, and the spectral analyzer is capable of obtaining the components of the combustion products during the combustion process of the metal particles.

6. The microscopic metal particle combustion test device according to claim 1, wherein The combustion test assembly further includes an ultraviolet lamp, and the ultraviolet lamp serves as a light source.

7. The microscopic metal particle combustion test device according to claim 1, characterized in that, The ignition source is a 532nm YAG laser or a 1064nm laser or a carbon dioxide laser.

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