Solid engine thermal insulation layer ablation performance parallel assessment test device

Abstract

The invention discloses a solid engine thermal insulation layer ablation performance parallel assessment test device, which is composed of an engine combustion chamber and a parallel ablation test section, wherein the parallel ablation test section is installed at the rear end of the engine combustion chamber and connected through a fastening bolt. Two ablation test sections of the parallel assessment test device adopt the same structure and share the same combustion chamber assembly; wherein the ablation test section adopts a channel with a square cross section and can adopt different turningangles, so that the ablation characteristics of the heat insulation layer under different particle scouring angle conditions are researched; the heat insulation layer test piece is positioned at thegroove part of the airflow scouring surface of the ablation test section and is used for researching the ablation resistance of the heat insulation layer test piece under the airflow scouring condition. A gas flow guide graphite part is mounted at the rear end socket of the combustion chamber to reduce the radial loss of gas flow. The parallel assessment test device is simple in structure, convenient to install and use and capable of effectively carrying out screening and assessment verification test research on heat insulation layer materials.

Description

technical field [0001] The invention relates to the technical field of ablation of solid motor heat insulation materials, in particular to a comparative assessment test device for the ablation resistance performance of a solid rocket motor heat insulation layer. Background technique [0002] In order to improve the specific impulse and energy characteristics of the propellant used in the solid rocket motor, metal powder, such as AL powder, is usually added. On the one hand, the addition of metal powder increases the energy characteristics of the propellant and inhibits the phenomenon of unstable combustion, but at the same time, the combustion products will contain high-temperature metal oxides, and the two-phase flow will affect the anti-ablation performance of the engine insulation layer. Come to the bigger test. [0003] Carrying out ablation tests on thermal insulation materials is a necessary means for ablation performance research, such as oxyacetylene ablation tests,...

AI Technical Summary

Problems solved by technology

[0004] In the article "Experimental Research on Ablation Rate of Insulation Layer in Solid Rocket Motor" ("Propulsion Technology", 1993(4):31-35), a test engine for insulation layer ablation test was proposed, which can truly reflect the performance of the experimental engine. The ablation environment mainly includes the combustion chamber, the low-speed test section, the variable-speed test section, the high-speed test section and the nozzle. The effect of the airflow velocity on the ablation performance of the material can be studied by placing the insulation layer in different positions. The disadvantage is that it cannot simulate overload Effect of Particle Scouring on Ablation Performance of Thermal Insulation Layer under Conditions

[0005] The existing engine ablation tests are mostly used to study the influence of changes in environmental factors on the ablation performance of insulation materials, and there will be certain deviations in the evaluation of ablation performance of insulation materials

Due to the working characteristics of solid engines, there are usually certain deviations in the engines of different ignition tests, resulting in fluctuations in the ablation environment of pressure, temperature, airflow velocity, and particle concentration, which affects the evaluation of the ablation resistance of thermal insulation materials

Generally, it is impossible to peel off the influence of test environment differences on the ablation resistance of thermal insulation materials, which is not conducive to the assessment and evaluation of thermal insulation material formula improvement design

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