A method and device for visualizing the aerodynamic compression and tensile properties of powdered fuel

Abstract

The present invention discloses a method and device for visualizing the pneumatic compression and tensile characteristics of powdered fuel. The experimental device comprises: a sealed upper end cover, a sealed lower end cover, a cylindrical barrel, an air inlet hole for gas entry is opened on the side wall of the cylindrical barrel, a lower groove is opened on the upper end wall of the cylindrical barrel from top to bottom, an insertion barrel, the upper end of which is integrally connected with the sealed upper end cover, and the lower end of which extends downward and extends into the lower groove, thereby forming a U-shaped air inlet channel in the lower groove, a transparent loading barrel, which is used to load powdered fuel, and the powdered fuel is used to cause the gas at the top of the inner cavity of the cylindrical barrel to slowly move downward to compress it, thereby obtaining the compression characteristics of the powdered fuel; the present invention can prevent the gas from moving upward when entering the inner cavity of the cylindrical barrel, but first converge at the top, thereby moving downward in a manner close to parallel to the powdered fuel accumulation surface, so that the powdered fuel accumulation surface remains horizontal during the intake compression process, making the test more accurate.

Description

Technical Field

[0001] The invention belongs to the field of powder fuel testing methods, and in particular relates to a method and device for visualizing the pneumatic compression and tensile properties of powder fuel. Background Art

[0002] Currently, powder fuel engine supply systems typically use pneumatic conveying to deliver powdered fuel to the combustion chamber. Specifically, the powdered fuel, pushed into the fluidizing chamber by a piston, is transported into the combustion chamber in the form of a gas-solid two-phase flow under the action of fluidizing gas. During the operation of a powder fuel engine, when the fluidizing gas enters the fluidizing chamber, it causes a sudden increase in pressure within the tank, compressing the powdered fuel to a certain extent and increasing the powder packing density. When the tank is vented, the pressure within the tank drops, causing a certain "expansion and stretching" effect on the powdered fuel remaining in the tank, reducing the powder packing density and ultimately making it difficult to accurately control the powder mass flow rate.

[0003] Research on the compression characteristics of powders is mainly concentrated in the fields of powder metallurgy and pharmaceutical preparation. There is no unified standard for the determination of powder compression curves, and the mold compression method is generally used for determination. The mold compression method usually involves first loading the powder into a precisely sized mold, and then using the punch on a material mechanics testing machine to slowly apply pressure to the powder in the mold. The pressure is directly measured using a pressure gauge, and the density of the compressed powder compact is usually determined by combining the in-mold method and the out-of-mold method. The in-mold method is obtained using the stress-strain curve drawing device on the material mechanics testing machine, while the out-of-mold method refers to the drainage method measurement after the powder compact is demolded.

[0004] The aforementioned method uses a mechanical device to apply pressure to the powder to obtain a powder compaction curve, but this differs significantly from the force exerted by airflow on the powder in a powder feed system. Firstly, in a powder feed system, the force exerted by airflow on the powder includes both pressure and tensile force, whereas the die pressing method only applies pressure. Secondly, the die pressing method typically compresses the powder into a solid block, whereas a powder engine requires the powder to remain in a powdered state, and airflow pressure cannot compress the powder into a block. Thirdly, existing experimental equipment lacks visualization capabilities, making it impossible to visualize the effect of airflow on the powder packing density. However, airflow significantly influences the accumulation of powder fuel in a powder engine feed system, making the powder packing density in the tank unpredictable and hindering the precise control of the engine's thrust. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for visualizing the aerodynamic compression and tensile characteristics of powdered fuel, so as to solve the problem that the existing experimental device cannot accurately control and measure the dynamic changes of powdered fuel bulk density and powdered fuel flow rate.

[0006] The present invention adopts the following technical solution: a device for visualizing the pneumatic compression and tensile properties of powdered fuel, comprising:

[0007] Sealing upper end cover, sealing lower end cover, horizontal setting,

[0008] The cylindrical cylinder is vertically arranged and located between the sealing upper end cover and the sealing lower end cover, and is fixedly connected to the sealing upper end cover and the sealing lower end cover so that its inner cavity is sealed. An air inlet hole for gas entry is opened on the side wall of the cylindrical cylinder. A lower groove is opened on the upper end wall of the cylindrical cylinder from top to bottom. The lower groove is annular and is coaxially arranged with the cylindrical cylinder. The lower groove is connected to the air inlet hole.

[0009] The insertion cylinder is coaxially arranged with the cylindrical cylinder and is located between the sealing upper end cover and the cylindrical cylinder. Its upper end is integrally connected with the sealing upper end cover, and its lower end extends downward and extends into the lower groove, thereby forming a U-shaped air intake channel in the lower groove. The air intake channel is used for the gas entering through the air inlet hole to first flow downward, then move horizontally inward, and finally move upward and enter the top of the inner cavity of the cylindrical cylinder.

[0010] The transparent loading barrel is a container with an open top, located in the inner cavity of the cylindrical barrel, and is used to load powdered fuel. The powdered fuel is used to compress the gas at the top of the inner cavity of the cylindrical barrel after slowly moving downward, thereby obtaining the compression characteristics of the powdered fuel.

[0011] Furthermore, an air outlet is provided at the center of the sealed upper end cover, and the air outlet is used to discharge the gas entering the inner cavity of the cylindrical barrel, thereby obtaining the tensile expansion characteristics of the powdered fuel during the exhaust process.

[0012] Furthermore, the cylindrical tube is made of a transparent material and has scales marked on its side wall.

[0013] Furthermore, it also includes: a camera located on the periphery of the cylindrical barrel, used for recording the changing state of the powder fuel in the cylindrical barrel.

[0014] Furthermore, the air inlet is connected to the gas cylinder through an air inlet pipe, and a gas pressure reducing valve, an air inlet pressure sensor, an air inlet solenoid valve, and an air inlet regulating valve are provided on the air inlet pipe. The gas pressure reducing valve, the air inlet pressure sensor, the air inlet solenoid valve, and the air inlet regulating valve are all electrically connected to the acquisition and measurement control system.

[0015] Furthermore, the air outlet is connected to the outside through an air outlet pipe, and an exhaust regulating valve, an air outlet pressure sensor, and a ball valve are provided on the air outlet pipe. The exhaust regulating valve, the air outlet pressure sensor, and the ball valve are all electrically connected to the acquisition and measurement control system.

[0016] An experimental method for visualizing the pneumatic compression and tensile properties of powder fuel. When testing the compression properties of powder fuel, the method is as follows:

[0017] Open the gas pressure reducing valve, air intake solenoid valve, and air intake regulating valve on the air intake pipeline, and close the exhaust regulating valve and ball valve on the air outlet pipeline to allow the gas to enter the inner cavity of the cylindrical barrel and compress the powdered fuel. The data of the air intake pressure sensor is collected through the acquisition and control system, the status of the powdered fuel is photographed by the camera, and the scale corresponding to the powdered fuel accumulation surface is recorded through the scale of the cylindrical barrel.

[0018] Furthermore, when testing the tensile expansion characteristics of powdered fuel, the method is as follows:

[0019] Open the gas pressure reducing valve, air intake solenoid valve, and air intake regulating valve on the air intake pipeline, and close the exhaust regulating valve and ball valve on the air outlet pipeline to allow gas to enter the inner cavity of the cylindrical cylinder. After inflating the cylindrical cylinder to a predetermined pressure, close the gas pressure reducing valve, air intake solenoid valve, and air intake regulating valve, and open the exhaust regulating valve and ball valve to allow gas to be discharged from the air outlet. The data of the air outlet pressure sensor is collected through the acquisition and measurement control system, the status of the powder fuel is photographed by a camera, and the scale corresponding to the powder fuel accumulation surface is recorded through the scale of the cylindrical cylinder.

[0020] Furthermore, when testing the effect of air flow rate on powder compression characteristics, the method is as follows:

[0021] Open the gas pressure reducing valve, intake solenoid valve, and intake regulating valve on the intake pipe, and close the exhaust regulating valve and ball valve on the outlet pipe to allow gas to enter the inner cavity of the cylindrical barrel. Adjust the opening size of the intake regulating valve to change the intake flow rate, and then test the influence of the intake flow rate on the powder compression characteristics. Collect data from the intake pressure sensor through the acquisition and control system, use a camera to capture the state of the powder fuel, and record the scale corresponding to the powder fuel accumulation surface through the scale of the cylindrical barrel.

[0022] Furthermore, the method includes testing the effect of multiple starting processes on the powder compression characteristics, wherein:

[0023] Open the gas pressure reducing valve, intake solenoid valve, and intake regulating valve on the intake pipe, and close the exhaust regulating valve and ball valve on the outlet pipe to allow gas to enter the inner cavity of the cylindrical barrel. Adjust the on and off of the intake solenoid valve, and then test the impact of multiple start-up processes on the powder compression characteristics. Collect data from the intake pressure sensor through the acquisition and control system, use a camera to capture the status of the powder fuel, and record the scale corresponding to the powder fuel accumulation surface through the scale of the cylindrical barrel.

[0024] The beneficial effects of the present invention are:

[0025] 1. The experimental device of the present invention forms an air intake channel through the cooperation of the cylindrical barrel and the sealed upper end cap. This allows the gas to first pass through the air intake hole and then through the lower groove, that is, to first flow downward, then move horizontally inward, and finally move upward and enter the top of the inner cavity of the cylindrical barrel. This can prevent the gas from moving upward when entering the inner cavity of the cylindrical barrel, but instead first converges at the top, thereby moving downward in a manner nearly parallel to the powder fuel accumulation surface. This ensures that the powder fuel accumulation surface remains horizontal during the intake compression process, making the test more accurate.

[0026] 2. To ensure that the powder fuel accumulation surface is level during the experiment, the experimental device of the present invention first fills excess powder fuel into the transparent charging barrel, and then uses a scraper to scrape the powder accumulation surface along the edge of the transparent charging barrel flat. During assembly, in order not to affect the initial accumulation state of the powder fuel, the transparent charging barrel filled with powder fuel is first placed on the sealed lower end cover, and then the cylindrical barrel and the sealed upper end cover are assembled in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 is the powder fuel compression ratio under different fluidizing gas amounts of the present invention;

[0029] Figure 3 is the compression ratio of the powder fuel under different initial pressures of the present invention.

[0030] Among them: 1. Sealing upper end cover; 2. Sealing lower end cover; 3. Cylindrical tube; 4. Air inlet hole; 5. Insertion tube; 6. Transparent loading tube; 7. Camera; 8. Gas cylinder; 9. Gas pressure reducing valve; 10. Inlet pressure sensor; 11. Inlet solenoid valve; 12. Inlet regulating valve; 13. Exhaust regulating valve; 14. Outlet pressure sensor; 15. Ball valve. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. 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. Therefore, they cannot be understood as limitations on the present invention. In the absence of substantial changes in the technical content, they should also be regarded as the scope of implementation of the present invention.

[0034] The present invention discloses a device for visualizing the pneumatic compression and tensile properties of powder fuel. Figure 1 As shown, it includes a sealing upper end cover 1, a sealing lower end cover 2, a cylindrical tube 3, an insertion tube 5, and a transparent charging tube 6.

[0035] The sealed upper end cap 1 and the sealed lower end cap 2 are arranged horizontally, and the cylindrical barrel 3 is arranged vertically. The cylindrical barrel 3 is made of a transparent material and has a scale marked on the side wall. The cylindrical barrel 3 is located between the sealed upper end cap 1 and the sealed lower end cap 2, and the cylindrical barrel 3 is fixedly connected to the sealed upper end cap 1 and the sealed lower end cap 2, so that the inner cavity of the cylindrical barrel 3 is sealed. The side wall of the cylindrical barrel 3 is provided with an air inlet 4 for gas to enter. The upper end wall of the cylindrical barrel 3 is provided with a lower groove from top to bottom. The lower groove is annular and coaxial with the cylindrical barrel 3. The lower groove is connected to the air inlet 4.

[0036] The insertion tube 5 is arranged vertically, and the insertion tube 5 is a cylindrical structure with openings at the top and bottom. The insertion tube 5 is coaxially arranged with the cylindrical tube 3. The insertion tube 5 is located between the sealing upper end cover 1 and the cylindrical tube 3. The upper end of the insertion tube 5 is integrally connected with the sealing upper end cover 1, and the lower end of the insertion tube 5 extends downward and extends into the lower groove, thereby forming a U-shaped air intake channel in the lower groove. The air intake channel is used for the gas entering through the air inlet hole 4 to first flow downward, then move horizontally inward, and finally move upward and enter the top of the inner cavity of the cylindrical tube 3.

[0037] The transparent loading barrel 6 is a container with an open top. The transparent loading barrel 6 is located in the inner cavity of the cylindrical barrel 3. The transparent loading barrel 6 is used to load powdered fuel. The powdered fuel is used to compress the gas at the top of the inner cavity of the cylindrical barrel 3 after slowly moving downward, thereby obtaining the compression characteristics of the powdered fuel.

[0038] An air outlet is provided at the center of the sealed upper end cover 1 , and the air outlet is used to discharge the gas entering the inner cavity of the cylindrical tube 3 , thereby obtaining the tensile expansion characteristics of the powdered fuel during the exhaust process.

[0039] The present invention further comprises a camera 7 , which is located outside the cylindrical barrel 3 and is used to record the changing state of the powdered fuel in the cylindrical barrel 3 .

[0040] The air inlet 4 is connected to the gas cylinder 8 through the air inlet pipe, and a gas pressure reducing valve 9, an air inlet pressure sensor 10, an air inlet solenoid valve 11, and an air inlet regulating valve 12 are provided on the air inlet pipe. The gas pressure reducing valve 9, the air inlet pressure sensor 10, the air inlet solenoid valve 11, and the air inlet regulating valve 12 are all electrically connected to the acquisition and measurement control system.

[0041] The air outlet is connected to the outside through an air outlet pipe, and an exhaust regulating valve 13, an air outlet pressure sensor 14, and a ball valve 15 are provided on the air outlet pipe. The exhaust regulating valve 13, the air outlet pressure sensor 14, and the ball valve 15 are all electrically connected to the acquisition and measurement control system.

[0042] The present invention also discloses an experimental method for a visual powder fuel pneumatic compression and tensile properties experimental device. When testing the compression properties of powder fuel, the method is as follows:

[0043] Open the gas pressure reducing valve 9, the air intake solenoid valve 11, and the air intake regulating valve 12 on the air intake pipeline, and close the exhaust regulating valve 13 and the ball valve 15 on the air outlet pipeline, so that the gas enters the inner cavity of the cylindrical barrel 3 and compresses the powdered fuel. The data of the air intake pressure sensor 10 is collected by the acquisition and control system, the state of the powdered fuel is photographed by the camera 7, and the scale corresponding to the powdered fuel accumulation surface is recorded by the scale of the cylindrical barrel 3, so as to obtain the compression characteristics of the powdered fuel during the air intake process.

[0044] When testing the tensile expansion properties of powdered fuel, the method is:

[0045] Open the gas pressure reducing valve 9, the air intake solenoid valve 11, and the air intake regulating valve 12 on the air intake pipeline, and close the exhaust regulating valve 13 and the ball valve 15 provided on the air outlet pipeline to allow the gas to enter the inner cavity of the cylindrical tube 3. After inflating the cylindrical tube 3 to a predetermined pressure, close the gas pressure reducing valve 9, the air intake solenoid valve 11, and the air intake regulating valve 12, and open the exhaust regulating valve 13 and the ball valve 15 to allow the gas to be discharged from the air outlet. The data of the air outlet pressure sensor 14 is collected by the acquisition and measurement control system, the state of the powder fuel is photographed by the camera 7, and the scale corresponding to the powder fuel accumulation surface is recorded through the scale of the cylindrical tube 3.

[0046] When testing the effect of air flow on powder compression characteristics, the method is as follows:

[0047] Open the gas pressure reducing valve 9, the air intake solenoid valve 11, and the air intake regulating valve 12 on the air intake pipeline, and close the exhaust regulating valve 13 and the ball valve 15 on the air outlet pipeline to allow the gas to enter the inner cavity of the cylindrical barrel 3. Adjust the opening size of the air intake regulating valve 12 to change the air intake flow rate, that is, the influence of the process of the air intake flow rate changing from small to large and from large to small on the powder compression characteristics, and then test the influence of the air intake flow rate on the powder compression characteristics. Collect data from the air intake pressure sensor 10 through the acquisition and measurement and control system, use the camera 7 to shoot the state of the powder fuel, and record the scale corresponding to the powder fuel accumulation surface through the scale of the cylindrical barrel 3.

[0048] When testing the effect of multiple start-up processes on the powder compression characteristics, the method is:

[0049] Open the gas pressure reducing valve 9, the air intake solenoid valve 11, and the air intake regulating valve 12 on the air intake pipeline, and close the exhaust regulating valve 13 and the ball valve 15 on the air outlet pipeline to allow the gas to enter the inner cavity of the cylindrical barrel 3. Adjust the on-off of the air intake solenoid valve 11, and then test the influence of multiple starting processes on the powder compression characteristics. Collect data from the air intake pressure sensor 10 through the acquisition and control system, use the camera 7 to shoot the state of the powder fuel, and record the scale corresponding to the powder fuel accumulation surface through the scale of the cylindrical barrel 3.

[0050] Example 1

[0051] This embodiment shows the experimental results of the present invention for studying the dynamic response characteristics of powder fuel filling density under the action of carrier gas. The dynamic response characteristics experiments of powder fuel filling density under the intake process and the exhaust process were carried out.

[0052] During the intake process, the volume compression rate of the powdered fuel is as follows: Figure 2 As shown, as the intake process proceeds, the volume compression rate of the powder continues to increase, but the rate of increase continues to decrease until it stabilizes, and the greater the intake air flow rate, the greater the volume compression rate of the powder.

[0053] During the exhaust process, the volume compression rate of the powdered fuel is as follows: Figure 3 As shown in FIG, as the exhaust process proceeds, the volume compression of the powder first decreases and then increases, and the greater the exhaust pressure, the smaller the minimum volume compression rate of the powder.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A visual experimental device for the pneumatic compression and tensile properties of powdered fuel, characterized by: include: The sealing upper end cover (1) and the sealing lower end cover (2) are arranged horizontally. The cylindrical barrel (3) is vertically arranged and located between the sealing upper end cover (1) and the sealing lower end cover (2), and is fixedly connected to the sealing upper end cover (1) and the sealing lower end cover (2), so that its inner cavity is sealed. An air inlet (4) for gas to enter is provided on the side wall of the cylindrical barrel (3), and a lower groove is provided on the upper end wall of the cylindrical barrel (3) from top to bottom. The lower groove is annular and is coaxially arranged with the cylindrical barrel (3), and the lower groove is connected to the air inlet (4). The insertion tube (5) is coaxially arranged with the cylindrical tube (3) and is located between the sealing upper end cover (1) and the cylindrical tube (3). Its upper end is integrally connected to the sealing upper end cover (1), and its lower end extends downward and extends into the lower groove, thereby forming a U-shaped air inlet channel in the lower groove. The air inlet channel is used for the gas entering through the air inlet hole (4) to first flow downward, then move horizontally inward, and finally move upward and enter the top of the inner cavity of the cylindrical tube (3). The transparent charging barrel (6) is a container with an open top, located in the inner cavity of the cylindrical barrel (3), and is used to load powder fuel. The powder fuel is used to compress the gas at the top of the inner cavity of the cylindrical barrel (3) after slowly moving downward, thereby obtaining the compression characteristics of the powder fuel; An air outlet is provided at the center of the sealed upper end cover (1), and the air outlet is used to discharge the gas entering the inner cavity of the cylindrical barrel (3), thereby obtaining the tensile expansion characteristics of the powdered fuel during the exhaust process.

2. A visual powder fuel pneumatic compression and tension characteristics experimental device according to claim 1, characterized in that: The cylindrical barrel (3) is made of a transparent material and has scales marked on its side wall.

3. A visual powder fuel pneumatic compression and tension characteristics experimental device according to claim 2, characterized in that: Also includes: A camera (7) is located on the periphery of the cylindrical barrel (3) and is used to record the changing state of the powdered fuel in the cylindrical barrel (3).

4. A visual powder fuel pneumatic compression and tension characteristics experimental device according to claim 2 or 3, characterized in that: The air inlet (4) is connected to the gas cylinder (8) through an air inlet pipeline. A gas pressure reducing valve (9), an air inlet pressure sensor (10), an air inlet solenoid valve (11), and an air inlet regulating valve (12) are provided on the air inlet pipeline. The gas pressure reducing valve (9), the air inlet pressure sensor (10), the air inlet solenoid valve (11), and the air inlet regulating valve (12) are all electrically connected to a data acquisition and measurement control system.

5. The visual powder fuel pneumatic compression and tension characteristics experimental device according to claim 4, characterized in that: The air outlet is connected to the outside through an air outlet pipeline. An exhaust regulating valve (13), an air outlet pressure sensor (14), and a ball valve (15) are provided on the air outlet pipeline. The exhaust regulating valve (13), the air outlet pressure sensor (14), and the ball valve (15) are all electrically connected to the acquisition and measurement control system.

6. An experimental method based on the visual powder fuel pneumatic compression and tension characteristics experimental device according to claim 5, characterized in that: When testing the compression characteristics of powdered fuel, the method is: The gas pressure reducing valve (9), the air inlet solenoid valve (11), and the air inlet regulating valve (12) on the air inlet pipe are opened, and the exhaust regulating valve (13) and the ball valve (15) provided on the air outlet pipe are closed, so that the gas enters the inner cavity of the cylindrical barrel (3) and compresses the powder fuel. The data of the air inlet pressure sensor (10) is collected by the acquisition and control system, the state of the powder fuel is photographed by the camera (7), and the scale corresponding to the accumulation surface of the powder fuel is recorded by the scale of the cylindrical barrel (3).

7. The experimental method of the visual powder fuel pneumatic compression and tension characteristics experimental device according to claim 6, characterized in that: Also included is the method for testing the tensile expansion properties of powdered fuels: The gas pressure reducing valve (9), the air inlet solenoid valve (11), and the air inlet regulating valve (12) on the air inlet pipe are opened, and the exhaust regulating valve (13) and the ball valve (15) provided on the air outlet pipe are closed, so that the gas enters the inner cavity of the cylindrical barrel (3), and after the cylindrical barrel (3) is inflated to a predetermined pressure, the gas pressure reducing valve (9), the air inlet solenoid valve (11), and the air inlet regulating valve (12) are closed, and the exhaust regulating valve (13) and the ball valve (15) are opened, so that the gas is discharged from the air outlet hole, and the data of the air outlet pressure sensor (14) is collected by the acquisition and control system, the state of the powder fuel is photographed by the camera (7), and the scale corresponding to the powder fuel accumulation surface is recorded by the scale of the cylindrical barrel (3).

8. The experimental method of the visual powder fuel pneumatic compression and tension characteristics experimental device according to claim 7, characterized in that: It also includes the test of the effect of air flow rate on the powder compression characteristics, the method is: The gas pressure reducing valve (9), the air intake solenoid valve (11), and the air intake regulating valve (12) on the air intake pipeline are opened, and the exhaust regulating valve (13) and the ball valve (15) provided on the air outlet pipeline are closed, so that the gas enters the inner cavity of the cylindrical barrel (3). The opening size of the air intake regulating valve (12) is adjusted to change the air intake flow rate, and then the influence of the air intake flow rate on the powder compression characteristics is tested. The data of the air intake pressure sensor (10) is collected by the acquisition and control system, the state of the powder fuel is photographed by the camera (7), and the scale corresponding to the accumulation surface of the powder fuel is recorded by the scale of the cylindrical barrel (3).

9. The experimental method of the visual powder fuel pneumatic compression and tension characteristics experimental device according to claim 8, characterized in that: The method also includes testing the effect of multiple starting processes on the powder compression characteristics, wherein the method comprises: opening the gas pressure reducing valve (9), the air intake solenoid valve (11), and the air intake regulating valve (12) on the air intake pipeline, closing the exhaust regulating valve (13) and the ball valve (15) provided on the air outlet pipeline, allowing the gas to enter the inner cavity of the cylindrical barrel (3), adjusting the on-off of the air intake solenoid valve (11), and then testing the effect of multiple starting processes on the powder compression characteristics, collecting data from the air intake pressure sensor (10) through the acquisition and control system, photographing the state of the powder fuel through the camera (7), and recording the scale corresponding to the powder fuel accumulation surface through the scale of the cylindrical barrel (3).

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