Refined measurement method for solid propellant aluminum agglomerated particles

Abstract

The invention discloses a refined measurement method for solid propellant metal aluminum combustion agglomerated particles. The refined measurement method comprises the following steps: carrying out real-time measurement on metal combustion particles of a region above a solid propellant combustion surface, so as to obtain a holographic image of the metal combustion particles; pre-processing the holographic image of the metal combustion particles and reconstructing the holographic image of the metal combustion particles according to a de-noised particle holographic image; carrying out post-processing on the reconstructed holographic image of the metal combustion particles and carrying out granularity extraction; obtaining the quantity of the metal combustion particles and a volume probability distribution counting and fitting analysis result through calculation. According to the refined measurement method disclosed by the invention, the particles with the size of 10 mu m or more can beclearly obtained and the related measurement error can be reduced to 0.4 percent; the refined measurement method can be used for effectively measuring the granularity and space distribution in a dynamic combustion process of the solid propellant metal particles.

Description

【Technical field】 [0001] The invention belongs to the technical field of combustion testing of solid propellant aluminum agglomerated particles, and in particular relates to a refined measurement method for solid propellant agglomerated particles. 【Background technique】 [0002] Metal powder is widely used in solid propellants. On the one hand, it can effectively increase the combustion energy of the propellant, and on the other hand, it can also suppress the occurrence of combustion instability. During the combustion process of aluminum-containing solid propellants, as the propellant combustion surface recedes, most of the micron-sized initial aluminum particles are affected by gas-phase combustion heat feedback, and the phenomenon of aggregation, agglomeration and fusion occurs on the combustion surface, forming particles. Spherical agglomerated combustion particles with a diameter of more than 100 microns. Affected by the gas flow on the burning surface, the agglomerated...

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Problems solved by technology

However, in the process of propellant combustion, affected by factors such as combustion pressure, gas flow, and sound field oscillation, the combustion process of metal particles in the propellant combustion field is very complicated, and the reaction speed is fast, the thickness of the reaction area is thin, and the combustion particles The speed of movement is fast, so that the instantaneous dynamic combustion process of metal particles and the fine measurement of particle size have high requirements for time and space. Only a small amount of particle information on the focal plane cannot meet the research needs. The ability of large depth of field to obtain particle size information in a wide spatial range of the entire combustion field makes it difficult for traditional methods to achieve

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