A collection device for collecting particles on the burning surface of propellant

Abstract

The invention discloses a test device for collecting particles on the combustion surface of a propellant, comprising: an insulating collection tube, a collection liquid, a collection container and a shell; the shell is fixed at the upper end of the collection container, and the upper end of the collection container and the inner bottom of the shell are jointly provided with two or more through holes connecting the two, and an insulating collection tube is fixed in each through hole to connect the inside and outside of the collection container, and the upper end of the insulating collection tube is buried in the sample propellant, and the lower end is located above the collection liquid in the collection container; wherein the sample propellant is arranged in the shell, and the initial height is higher than the upper end of the insulating collection tube; the collection liquid is arranged in the collection container, and an exhaust hole is opened on the side, and the liquid level of the collection liquid is lower than the height of the exhaust hole.

Description

Technical Field

[0001] The invention relates to the technical field of solid rocket engines, and in particular to a collection device for collecting particles on the combustion surface of a propellant. Background Art

[0002] Solid rocket engines are generally composed of solid propellant grains, ignition mechanisms, shells, and nozzles. Most solid propellants contain metallic aluminum powder, and the content reaches more than 18%. When solid propellants burn, aluminum powder will produce a large number of Al2O3 particles during the combustion process. For propellants with an aluminum powder content of 18%, the amount of condensed phase particles Al2O3 generated is as high as 35%. The combustion process of solid propellants is complex, the gas temperature and pressure are very high, and the combustion products contain a lot of smoke, which makes it difficult to collect and analyze the propellant combustion particles online.

[0003] When the propellant burns, aluminum powder will agglomerate on the surface, increasing the particle size of the aluminum powder and further intensifying the deposition of condensed phase particles. For solid engines, condensed phase particles will intensify the ablation of the insulation structure. The characteristics of aluminum powder and the particle size distribution of condensed phase products affect the specific impulse of the engine. The size and distribution of condensed phase particles are the initial parameters for engine performance analysis and working process simulation, such as the analysis of the two-phase flow law of solid engines, the mechanical scouring and heat increment effect of condensed phase particles on the engine insulation layer and nozzle, and the inhibitory effect of condensed phase particles on combustion instability. Therefore, it is crucial to collect condensed phase products and obtain the characteristics of condensed phase products for the combustion and flow of engine propellants.

[0004] At present, the method for collecting condensed phase particles of propellant combustion products mainly utilizes liquid or gas to freeze the combustion products. The collected condensed phase particles are all condensed phase particles produced after the entire propellant specimen is completely burned. Particles on the propellant combustion surface cannot be collected; therefore, it is necessary to design a collection device that can be used to collect particles on the propellant combustion surface. Summary of the invention

[0005] In view of this, the present invention provides a collection device for collecting particles on the combustion surface of a propellant, which can effectively collect particles on the combustion surface of a propellant.

[0006] The technical solution of the present invention is: a test device for collecting particles on the combustion surface of a propellant, comprising: an insulating collection tube, a collection liquid, a collection container and a shell; the shell is fixed to the upper end of the collection container, and the upper end of the collection container and the inner bottom of the shell are jointly provided with two or more through holes connecting the two, and an insulating collection tube is fixed in each through hole to connect the inside and outside of the collection container, and the upper end of the insulating collection tube is buried in the sample propellant, and the lower end is located above the collection liquid in the collection container; wherein the sample propellant is provided in the shell, and the initial height is higher than the upper end of the insulating collection tube; the collection liquid is provided in the collection container, and an exhaust hole is provided on the side, and the liquid level of the collection liquid is lower than the height of the exhaust hole.

[0007] Preferably, the upper end of the collecting container and the inner bottom of the shell are jointly provided with nine through holes connecting the two, and the nine through holes are evenly arranged.

[0008] Preferably, the collecting container is a closed container when no exhaust hole is provided, and the shell is a container with an open upper end and a closed lower end.

[0009] Preferably, the collection liquid is cooling water.

[0010] Preferably, the sample propellant is cylindrical, and its outer diameter is Φ70 mm.

[0011] Preferably, the collecting container is cylindrical in shape, and its outer diameter is Φ100 mm.

[0012] Preferably, the heat-insulating collecting tube is a round tube with a diameter of Φ3 mm.

[0013] Beneficial effects:

[0014] 1. The collecting device of the present invention has a simple structure, is easy to operate, uses a small amount of sample propellant, and can effectively collect particles on the combustion surface of the propellant; at the same time, an exhaust hole is opened on the side of the collecting container, which can control the pressure in the collecting container to be the same as the atmospheric pressure, so there is no need to design a special device for adjusting the pressure; compared with the existing collecting device that collects all particles generated by combustion and does not specifically collect condensed phase particles on the combustion surface, the collecting device of the present invention can collect condensed phase particles on the combustion surface, which can provide experimental data support for subsequent research on combustion instability and thermal structure ablation.

[0015] 2. The through holes formed at the upper end of the collecting container and the inner bottom of the shell of the present invention facilitate the uniform arrangement of the insulating collecting tubes, thereby collecting all the combustion particles on the combustion surface as much as possible.

[0016] 3. The design of the shape and size of the sample propellant and the collection container in the present invention is conducive to ensuring that all combustion particles are collected.

[0017] 4. The shape and size of the heat-insulating collection tube of the present invention can be designed to adapt to the size of the sample propellant and the collection container in the collection device, and is also conducive to collecting combustion particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the collecting device of the present invention.

[0019] Among them, 1-burning particles; 2-burning surface; 3-sample propellant; 4-insulated collection tube; 5-collecting liquid; 6-collecting particles; 7-collecting container; 8-shell; 9-burning flame. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0021] This embodiment provides a device for collecting particles on the combustion surface of a propellant, which can effectively collect particles on the combustion surface of a propellant.

[0022] like Figure 1 As shown, the collecting device comprises: an insulated collecting tube 4, a collecting liquid 5, a collecting container 7 and a shell 8; the shell 8 is fixed to the upper end of the collecting container 7, and the upper end of the collecting container 7 and the inner bottom of the shell 8 are jointly provided with two or more through holes (preferably nine relatively evenly arranged through holes) connecting the collecting container 7 and the shell 8, and an insulated collecting tube 4 is fixed in each through hole to connect the inside and outside of the collecting container 7, and the upper end of the insulated collecting tube 4 is buried in the sample propellant 3, and the lower end is located above the collecting liquid 5 in the collecting container 7; wherein the shell 8 is provided with the sample propellant 3, and the initial height is slightly higher than the upper end of the insulated collecting tube 4; the collecting container 7 is provided with the collecting liquid 5, and an exhaust hole is provided on the side (for ensuring that the pressure in the collecting container 7 is the same as the atmospheric pressure), and at the same time, the liquid level of the collecting liquid 5 is lower than the height of the exhaust hole;

[0023] The sample propellant 3 burns in the atmospheric environment. When the sample propellant 3 burns until its combustion surface 2 is flush with the upper end of the insulated collecting tube 4, the combustion particles 1 (combustion products of the sample propellant 3) on the combustion surface 2 enter the insulated collecting tube 4 under the action of the positive pressure difference and fall into the collecting liquid 5 in the collecting container 7, forming collected particles 6 for subsequent particle analysis; wherein the positive pressure difference is the difference between the high pressure of the flame combustion of the sample propellant 3 and the atmospheric pressure in the collecting container 7.

[0024] In this embodiment, the collecting container 7 is a closed container when no exhaust hole is provided, which is convenient for installing the shell and for containing the collecting liquid 5; the shell 8 is a container with an open upper end and a closed lower end.

[0025] In this embodiment, the sample propellant 3 is cylindrical, and its outer diameter is preferably Φ70mm; the shape of the collecting container 7 is cylindrical, and its outer diameter is preferably Φ100mm. The outer diameter of the sample propellant 3 is smaller than the outer diameter of the collecting container 7 to ensure that all the combustion particles 1 can be collected.

[0026] In this embodiment, the heat-insulating collection tube 4 is a round tube with a tube diameter of Φ3 mm, which can adapt to the size of the sample propellant 3 and the collection container 7 in the collection device and can effectively collect the combustion particles 1.

[0027] In this embodiment, the collecting liquid 5 is cooling water, which is used to freeze the combustion particles 1 to make them into collected particles 6.

[0028] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A test device for collecting particles on the surface of a propellant combustion, characterized in that: include: An insulated collecting tube (4), a collecting liquid (5), a collecting container (7) and a shell (8); the shell (8) is fixed to the upper end of the collecting container (7); the upper end of the collecting container (7) and the inner bottom of the shell (8) are provided with two or more through holes connecting the two; an insulated collecting tube (4) is fixed in each through hole to connect the inside and outside of the collecting container (7); the upper end of the insulated collecting tube (4) is buried in the sample propellant (3) and the lower end is located above the collecting liquid (5) in the collecting container (7); wherein the sample propellant (3) is provided in the shell (8) and the initial height is higher than the upper end of the insulated collecting tube (4); the collecting liquid (5) is provided in the collecting container (7) and an exhaust hole is provided on the side thereof, and the liquid level of the collecting liquid (5) is lower than the height of the exhaust hole.

2. The test device for collecting particles on the propellant combustion surface as claimed in claim 1, characterized in that: The upper end of the collection container (7) and the inner bottom of the shell (8) are jointly provided with nine through holes that communicate with the two, and the nine through holes are evenly arranged.

3. The test device for collecting particles on the propellant combustion surface as claimed in claim 1, characterized in that: The collecting container (7) is a closed container when no exhaust hole is provided, and the shell (8) is a container with an open upper end and a closed lower end.

4. The test device for collecting particles on the propellant combustion surface as claimed in claim 1, characterized in that: The collecting liquid (5) is cooling water.

5. The test device for collecting particles on the propellant combustion surface as claimed in claim 1, 2, 3 or 4, characterized in that: The sample propellant (3) is cylindrical, and its outer diameter is Φ70 mm.

6. The test device for collecting particles on the propellant combustion surface as claimed in claim 5, characterized in that: The collecting container (7) is cylindrical in shape, and its outer diameter is Φ100 mm.

7. The test device for collecting particles on the propellant combustion surface as claimed in claim 5, characterized in that: The heat-insulating collecting pipe (4) is a round pipe with a diameter of Φ3 mm.

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