Nanofluid fuel solid phase dynamic evolution analysis device and method based on CO2 laser

Abstract

The invention relates to a nanofluid fuel solid phase dynamic evolution analysis device and method based on CO2 laser. The device comprises a control module, and a sample fixing module, an ignition module, a combustion stopping module and a combustion diagnosis module which are connected with the control module, the ignition module comprises a CO2 laser, a light path adjusting assembly and a power regulator, the power regulator is connected with the CO2 laser and used for adjusting laser power, and the light path adjusting assembly is used for focusing CO2 laser on a sample; the combustion stopping module is used for controlling a combustion product of the sample; and the combustion diagnosis module is used for acquiring the emission spectrum and the combustion morphology of the sample in the combustion process. Compared with the prior art, the method has the advantages that products of the nanofluid fuel at any stage in the combustion process under various working conditions can be obtained, and the combustion state can be effectively regulated and controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel technology, and in particular to a device and method for analyzing the solid phase dynamic evolution of nanofluid fuel based on CO2 laser. Background Art

[0002] As a new type of high-density aerospace propulsion fuel, nanofluid fuel is mainly made of nano-aluminum, boron and other metal particles uniformly dispersed in liquid hydrocarbon fuel. It can significantly increase the energy density of fuel while retaining the fluidity of liquid fuel, and has unique advantages in breaking through the current bottleneck of liquid fuel development. The combustion of nanofluid fuel is coupled by the evaporation combustion of liquid fuel, the oxidation combustion of solid particles and the interaction between solid and liquid. Among them, solid metal particles have higher energy density, and their full oxidation combustion is the key to achieving the energy release of nanofluid fuel.

[0003] Compared with single particles, solid metal particles in nanofluid fuel droplets tend to form agglomerate structures as the liquid phase evaporates, and ignite and burn based on this as the energy release unit. This process is closely related to material diffusion, heat transfer, and physical and chemical reactions between the environment and the agglomerate surface, particles and particles, and particle surface and particle interior. It is a complex coupling of single-particle physical and chemical reactions and spatial heat and mass transfer processes, and is manifested as oxidative combustion of nanoparticle agglomerates accompanied by liquid phase evaporation.

[0004] The above process occurs continuously in a short period of time. Existing research is mostly focused on the original particle samples before combustion and the final products after combustion. It is difficult to explore the dynamic evolution of solid phase components during the combustion of nanofluid droplets. There is a lack of devices that can achieve the effective acquisition and fine analysis of the combustion state of two-phase fuels and the intermediate state of combustion, which greatly limits the in-depth exploration of the ignition and combustion mechanism of nanofluid fuels. Therefore, it is necessary to provide a device that can effectively acquire the intermediate state of combustion and the combustion state of two-phase fuels. Summary of the invention

[0005] The purpose of the present invention is to provide a CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device and method in order to overcome the defects of the above-mentioned prior art that it is unable to achieve the two-phase fuel combustion state regulation and the effective acquisition of the intermediate state of combustion.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] This solution provides a CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device, including a control module and a sample fixing module, an ignition module, a combustion termination module and a combustion diagnosis module connected to the control module;

[0008] The ignition module includes a CO2 laser, an optical path adjustment component and a power regulator, wherein the power regulator is connected to the CO2 laser and is used to adjust the laser power, and the optical path adjustment component is used to focus the CO2 laser onto the sample; the combustion termination module is used to control the combustion products of the sample; and the combustion diagnosis module is used to obtain the emission spectrum and combustion morphology during the combustion process of the sample.

[0009] Preferably, the combustion termination module comprises a liquid nitrogen injection assembly and a timing trigger, wherein the input end of the timing trigger is connected to the control module, and the output end is connected to the liquid nitrogen injection assembly, for controlling the time when the liquid nitrogen injection assembly terminates sample combustion.

[0010] Preferably, the combustion suspension module further comprises a sample collection component for collecting sample products after combustion suspension.

[0011] Preferably, the combustion diagnosis module comprises a fiber optic spectrometer and a high-speed camera; the fiber optic spectrometer is used to obtain the emission spectrum during the combustion of the sample, and the high-speed camera is used to obtain the real-time morphology of the combustion of the sample.

[0012] Preferably, the combustion diagnosis module also includes a temperature meter for obtaining the real-time temperature of the sample during the combustion process.

[0013] Preferably, the control module includes a computer and a synchronization trigger, one end of the synchronization trigger is connected to the computer, and the other end is respectively connected to the ignition module and the combustion diagnosis module, for controlling the synchronous triggering of the combustion diagnosis module and the ignition module.

[0014] Preferably, the CO2 laser comprises an AC power supply and a hollow tubular CO2 laser tube, the control module controls the connection to the AC power supply, and the output end of the AC power supply is respectively connected to the hollow tubular CO2 laser tube and the combustion diagnosis module.

[0015] Preferably, the optical path adjustment component includes a reflector and a condenser; the reflector is tilted and fixed at the output end of the hollow tubular CO2 laser tube to reflect the laser line emitted by the hollow tubular CO2 laser tube onto the condenser, and the condenser is used to focus the laser on the sample.

[0016] Preferably, the sample fixing module comprises a fixing bracket and a silicon carbide fiber filament, one end of the silicon carbide fiber filament is mounted on the fixing bracket, and one end of the silicon carbide fiber filament away from the fixing bracket is used for hanging the sample.

[0017] This solution also provides a method for analyzing the solid phase dynamic evolution of nanofluid fuel based on CO2 laser, using the above-mentioned nanofluid fuel solid phase dynamic evolution analysis device based on CO2 laser, including the following steps:

[0018] The sample is suspended on the sample fixing module, and the sample is adjusted to a preset focus position; the laser emitted by the CO2 laser is focused on the sample at the preset focus position through the optical path adjustment component, and the sample is ignited;

[0019] The combustion state of the sample is dynamically monitored through the combustion diagnosis module to obtain the time distribution characteristics of the characteristic combustion of the sample;

[0020] The combustion cessation module is used to suspend the combustion of samples at multiple time points during combustion, and the initial state, intermediate state of combustion and combustion products of the samples are obtained;

[0021] Characterize and analyze the physical and chemical properties of sample combustion products to obtain the evolution characteristics of the solid phase during sample combustion;

[0022] The power of the laser emitted by the CO2 laser is adjusted by a power regulator, and the above steps are repeated to obtain the combustion evolution characteristics of the sample under three working conditions: pure physical evaporation, liquid phase evaporation combustion, and agglomerate combustion.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) This scheme transfers and focuses the laser light emitted by the CO2 laser onto the sample through the optical path adjustment component, which can realize the contactless ignition and combustion control of nanofluid droplets; the continuous adjustment of the laser power emitted by the CO2 laser can realize the input energy regulation of the nanofluid sample, so that the droplets undergo three typical states: pure physical evaporation, liquid single-phase combustion, and solid-liquid two-phase combustion, thereby realizing effective control of the combustion state of the nanofluid fuel, being able to analyze the combustion of the sample under various working conditions, and improving the practical application range of the device.

[0025] (2) This scheme can realize accurate diagnosis of the ignition and combustion distribution characteristics of nanofluid fuel droplets. By coupling three combustion diagnostic devices, namely, a high-speed camera, a fiber optic spectrometer, and a high-speed thermometer, the overall combustion characteristic behavior of the droplet combustion can be accurately captured. At the same time, based on the time when the characteristic emission spectrum appears, the phased distribution characteristics of the fuel droplet combustion can be obtained, thereby accurately predicting the key time nodes of the droplet combustion. The synchronous trigger of the control module controls the synchronous triggering of the diagnostic instrument and the laser to ensure accurate monitoring of the sample combustion process.

[0026] (3) This scheme can achieve the timed termination of droplet combustion through the timed liquid nitrogen injection assembly, generate a trigger signal through the computer preset timing, and use the liquid nitrogen injection assembly to block the sample combustion at the critical time point, so as to achieve the cold storage of the sample state, so as to obtain the intermediate state of the nanofluid fuel combustion, which is convenient for the subsequent physical and chemical characterization test and analysis of the combustion products to obtain the dynamic evolution characteristics of the fuel combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device provided by the present invention;

[0028] In the figure: 1. AC power supply, 2. hollow tubular CO2 laser tube, 3. reflector, 4. condenser, 5. sample, 6. fixed bracket, 7. sample collection assembly, 8. liquid nitrogen injection assembly, 9. timing trigger, 10. computer, 11. synchronization trigger, 12. fiber optic spectrometer, 13. high-speed camera, 14. silicon carbide fiber filament. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0033] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment provides a CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device, including a control module and a sample fixing module, an ignition module, a combustion termination module and a combustion diagnosis module connected to the control module;

[0037] The ignition module includes a CO2 laser, an optical path adjustment component and a power regulator. The power regulator is connected to the CO2 laser to adjust the laser power, and the optical path adjustment component is used to focus the CO2 laser onto the sample; the combustion termination module is used to control the combustion products of the sample; the combustion diagnosis module is used to obtain the emission spectrum and combustion morphology during the combustion process of the sample.

[0038] By transferring and focusing the laser light emitted by the CO2 laser onto the sample through the optical path adjustment component, contactless ignition and combustion control of nanofluid droplets can be achieved; continuous adjustment of the laser power emitted by the CO2 laser can realize input energy regulation of the nanofluid sample, so that the droplets undergo three typical states: pure physical evaporation, liquid single-phase combustion, and solid-liquid two-phase combustion, thereby achieving effective control of the combustion state of the nanofluid fuel, being able to analyze the combustion of the sample under various working conditions, and improving the practical application range of the device.

[0039] In a preferred embodiment, the combustion suspension module includes a liquid nitrogen injection assembly 8 and a timing trigger 9, wherein the input end of the timing trigger 9 is connected to the control module, and the output end is connected to the liquid nitrogen injection assembly 8, for controlling the time when the liquid nitrogen injection assembly 8 stops the sample combustion. The combustion suspension module also includes a sample collection assembly 7, for collecting sample products after the combustion is stopped.

[0040] The timed termination of droplet combustion is achieved through the timed liquid nitrogen injection assembly, and a trigger signal is generated through the preset timing of the computer, so that the liquid nitrogen injection assembly can generate a low-temperature liquid nitrogen spray to block the sample combustion at the critical time point, thereby achieving cold storage of the sample state to obtain the intermediate state of combustion of the nanofluid fuel, which is convenient for subsequent physical and chemical characterization test and analysis of the combustion products to obtain the dynamic evolution characteristics of the fuel combustion.

[0041] In a preferred embodiment, the combustion diagnosis module includes a fiber optic spectrometer 12 and a high-speed camera 13; the fiber optic spectrometer 12 is used to obtain the emission spectrum during the sample combustion process, and the high-speed camera 13 is used to obtain the real-time morphology of the sample combustion.

[0042] The combustion diagnosis module also includes a temperature meter for obtaining the real-time temperature of the sample during the combustion process.

[0043] Furthermore, the control module includes a computer 10 and a synchronization trigger 11, one end of the synchronization trigger 11 is connected to the computer, and the other end is respectively connected to the ignition module and the combustion diagnosis module, for controlling the synchronous triggering of the combustion diagnosis module and the ignition module.

[0044] By coupling three combustion diagnostic devices, namely a high-speed camera, a fiber optic spectrometer, and a high-speed thermometer, the overall combustion characteristic behavior in droplet combustion can be accurately captured. At the same time, based on the time when the characteristic emission spectrum appears, the phased distribution characteristics of fuel droplet combustion can be obtained, thereby accurately predicting the key time nodes of droplet combustion. The synchronous trigger of the control module controls the synchronous triggering of the diagnostic instrument and the laser to ensure accurate monitoring of the sample combustion process. Accurate diagnosis of the ignition and combustion distribution characteristics of nanofluid fuel droplets is achieved.

[0045] The CO2 laser includes an AC power supply 1 and a hollow tubular CO2 laser tube 2. The control module controls the connection to the AC power supply 1. The output end of the AC power supply 1 is respectively connected to the hollow tubular CO2 laser tube 2 and the combustion diagnosis module. The optical path adjustment component includes a reflector 3 and a condenser 4. The reflector 3 is tilted and fixed at the output end of the hollow tubular CO2 laser tube 2 to reflect the laser line emitted by the hollow tubular CO2 laser tube 2 to the condenser 4. The condenser 4 is used to focus the laser on the sample 5.

[0046] Specifically, the CO2 laser includes an AC power supply, a power regulator, a hollow tubular CO2 laser tube, and a cooling water pipeline. The power regulator can be used to continuously adjust the laser power. After the AC power supply is turned on, the hollow tubular CO2 laser tube generates and emits a high-energy laser with a wavelength of 10.6μm. The direction is adjusted by the plane mirror and the condenser is focused on the sample droplet to ignite the sample. By adjusting the laser power, different ignition energies can be obtained, thereby achieving effective regulation of the sample combustion state.

[0047] The sample fixing module includes a fixing bracket 5 and a silicon carbide fiber filament 14 . One end of the silicon carbide fiber filament 14 is mounted on the fixing bracket 5 , and one end of the silicon carbide fiber filament 14 away from the fixing bracket 5 is used for hanging the sample 5 .

[0048] This embodiment also provides a method for analyzing the solid phase dynamic evolution of nanofluid fuel based on CO2 laser, using the above-mentioned nanofluid fuel solid phase dynamic evolution analysis device based on CO2 laser, including the following steps:

[0049] The sample is suspended on the sample fixing module, and the sample is adjusted to a preset focus position; the laser emitted by the CO2 laser is focused on the sample at the preset focus position through the optical path adjustment component, and the sample is ignited;

[0050] The combustion state of the sample is dynamically monitored through the combustion diagnosis module to obtain the time distribution characteristics of the characteristic combustion of the sample;

[0051] The combustion cessation module is used to suspend the combustion of samples at multiple time points during combustion, and the initial state, intermediate state of combustion and combustion products of the samples are obtained;

[0052] Characterize and analyze the physical and chemical properties of sample combustion products to obtain the evolution characteristics of the solid phase during sample combustion;

[0053] The power of the laser emitted by the CO2 laser is adjusted by a power regulator, and the above steps are repeated to obtain the combustion evolution characteristics of the sample under three working conditions: pure physical evaporation, liquid phase evaporation combustion, and agglomerate combustion.

[0054] In combination with the above preferred implementation, this embodiment also provides a more specific implementation, the nanofluid fuel solid phase dynamic evolution analysis device based on adjustable CO2 laser is composed of an ignition module, a sample module, a combustion termination module, a control module and a combustion diagnosis module. Among them, the ignition module includes a power supply 1 and a CO2 laser 2 for generating CO2 laser and a plane mirror 3 and a condenser 4 for adjusting the optical path; the sample module includes a suspension device 6 and a sample 5; the combustion termination module includes a droplet injection device 8 and a sample collection device 7, which are used to control the timing injection of liquid nitrogen and the collection of products; the control module includes a computer 10, which controls the combustion termination module through a program controller 9, and controls the synchronous triggering of the diagnostic instrument and the laser through a synchronous trigger 11; the combustion diagnosis module includes a fiber optic spectrometer 12 and a high-speed camera 13, which are used to obtain the emission spectrum and combustion morphology of the sample during combustion.

[0055] Combined with the analysis method, during the experiment, a micropipette is used to transfer 3-5 μL of sample 5, which is suspended on the silicon carbide fiber suspension device 6 to keep it at the front end of the fiber, and the position of the droplet is adjusted to be at the focus of the laser radiation energy. The computer 9 is used for ignition control, and the pulse wave generated by the synchronous trigger is used to trigger the laser 2 to generate laser through the AC power supply 1. The laser power is adjustable within the range of 0-450W.

[0056] In order to obtain three typical working conditions of pure physical evaporation of sample droplets, liquid phase evaporation combustion, and agglomerate combustion, by comparing the working conditions of pure physical evaporation and liquid phase evaporation combustion, the mechanism of the molecular gasification diffusion and chemical combustion reaction in liquid phase combustion on the formation process of nano-boron agglomerates in droplets can be analyzed; by comparing the working conditions of liquid phase evaporation combustion and agglomerate combustion, the dynamic evolution law of the microscopic pore structure of nano-boron agglomerates in the high-temperature thermal oxidation process can be revealed. After the laser is generated, the plane mirror 3 in the laser tube is used to adjust the laser light path, and the condenser 4 is used to focus the laser, so that the radiation energy is concentrated at the focus, forming a local high temperature to ignite the droplets.

[0057] During the sample combustion process, a high-speed camera 12 and a fiber optic spectrometer 11 are used to dynamically monitor the sample combustion state, and the time distribution characteristics of the characteristic combustion behavior of the nano-boron aggregates are clarified. On this basis, a trigger signal is compiled by a computer, and a liquid nitrogen injection device 7 is used to stop the combustion of the nano-boron aggregates at different time points during the combustion through a trigger 8, so as to obtain the initial state, intermediate state of the combustion and combustion products of the nano-boron aggregates, and realize the effective solidification and sealing of the dynamic evolution process of the nano-boron aggregates. On this basis, combined with a variety of modern analysis and testing methods, the physical and chemical properties of the nano-boron aggregates are characterized and analyzed to obtain the solid phase dynamic evolution characteristics of the nanofluid fuel during high-temperature combustion.

[0058] A CO2 laser with adjustable power is used to ignite a single droplet sample of nanofluid fuel, so that the sample enters different target combustion states, and a variety of instruments and equipment are used to synchronously diagnose the dynamic combustion process of the sample, obtain the phased distribution characteristics of fuel combustion, and determine the key combustion time node. On this basis, the timed termination and state sealing of sample combustion are achieved through a timed liquid nitrogen injection device, the key combustion intermediate state of nanofluid fuel is obtained, and a refined analysis of the dynamic evolution characteristics of nanofluid fuel is achieved.

[0059] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device, characterized in that: It includes a control module and a sample fixing module, an ignition module, a combustion termination module and a combustion diagnosis module connected to the control module; The ignition module includes a CO2 laser, an optical path adjustment component and a power regulator, wherein the power regulator is connected to the CO2 laser and is used to adjust the laser power, and the optical path adjustment component is used to focus the CO2 laser onto the sample; the combustion termination module is used to control the combustion products of the sample; and the combustion diagnosis module is used to obtain the emission spectrum and combustion morphology during the combustion process of the sample.

2. The CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device according to claim 1, characterized in that: The combustion cessation module comprises a liquid nitrogen injection assembly (8) and a timing trigger (9), wherein the input end of the timing trigger (9) is connected to the control module, and the output end is connected to the liquid nitrogen injection assembly (8), and is used to control the time when the liquid nitrogen injection assembly (8) stops the combustion of the sample.

3. The CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device according to claim 2, characterized in that: The combustion suspension module further comprises a sample collection component (7) for collecting sample products after combustion suspension.

4. The CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device according to claim 1, characterized in that: The combustion diagnosis module comprises a fiber optic spectrometer (12) and a high-speed camera (13); the fiber optic spectrometer (12) is used to obtain the emission spectrum during the combustion of the sample, and the high-speed camera (13) is used to obtain the real-time morphology of the combustion of the sample.

5. The CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device according to claim 4, characterized in that: The combustion diagnosis module also includes a temperature measuring instrument for obtaining the real-time temperature of the sample during the combustion process.

6. The CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device according to claim 1, characterized in that: The control module comprises a computer (10) and a synchronization trigger (11), one end of the synchronization trigger (11) is connected to the computer, and the other end is respectively connected to the ignition module and the combustion diagnosis module, and is used to control the synchronous triggering of the combustion diagnosis module and the ignition module.

7. The CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device according to claim 1, characterized in that: The CO2 laser comprises an AC power supply (1) and a hollow tubular CO2 laser tube (2); the control module controls the connection to the AC power supply (1); and the output end of the AC power supply (1) is respectively connected to the hollow tubular CO2 laser tube (2) and the combustion diagnosis module.

8. The CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device according to claim 7, characterized in that: The optical path adjustment component comprises a reflector (3) and a condenser (4); the reflector (3) is tilted and fixed on the output end of the hollow tubular CO2 laser tube (2) to reflect the laser line emitted by the hollow tubular CO2 laser tube (2) onto the condenser (4); the condenser (4) is used to focus the laser on the sample (5).

9. The CO2 laser-based nanofluid fuel solid phase dynamic evolution analysis device according to claim 1, characterized in that: The sample fixing module comprises a fixing bracket (5) and a silicon carbide fiber filament (14), one end of the silicon carbide fiber filament (14) is mounted on the fixing bracket (5), and one end of the silicon carbide fiber filament (14) away from the fixing bracket (5) is used for hanging the sample (5).

10. A method for analyzing the solid phase dynamic evolution of nanofluid fuel based on CO2 laser, using a device for analyzing the solid phase dynamic evolution of nanofluid fuel based on CO2 laser according to any one of claims 1 to 9, characterized in that: The following steps are involved: Hang the sample on the sample fixing module and adjust the sample to a preset focusing position; The laser emitted by the CO2 laser is focused onto the sample at a preset focus position through an optical path adjustment component to ignite the sample; The combustion state of the sample is dynamically monitored through the combustion diagnosis module to obtain the time distribution characteristics of the characteristic combustion of the sample; The combustion cessation module is used to suspend the combustion of samples at multiple time points during combustion, and the initial state, intermediate state of combustion and combustion products of the samples are obtained; Characterize and analyze the physical and chemical properties of sample combustion products to obtain the evolution characteristics of the solid phase during sample combustion; The power of the laser emitted by the CO2 laser is adjusted by a power regulator, and the above steps are repeated to obtain the combustion evolution characteristics of the sample under three working conditions: pure physical evaporation, liquid phase evaporation combustion, and agglomerate combustion.

Images