A parallel evaluation test device for ablation performance of solid engine insulation layer

Abstract

The invention discloses a parallel assessment test device for the ablation performance of a solid engine heat insulation layer, which is composed of an engine combustion chamber and a parallel ablation test section. The parallel ablation test section is installed at the rear end of the engine combustion chamber and connected by fastening bolts. . The two ablation test sections of the parallel assessment test device adopt the same structure and share the same combustion chamber components; among them, the ablation test section adopts a square cross-section channel, and the ablation test section can use different turning angles to study different particle erosion Ablation properties of thermal insulation layer under angle conditions. The thermal insulation layer specimen is located in the groove of the airflow scoured surface of the ablation test section, and is used to study the ablation resistance characteristics of the thermal insulation layer specimen under the condition of airflow scour. The rear head of the combustion chamber is equipped with a gas flow guide graphite component to reduce the radial loss of the gas flow. The parallel assessment test device is simple in structure, easy to install and use, and can effectively carry out screening and assessment verification test research on insulation layer materials.

Description

technical field [0001] The invention relates to the technical field of ablation of solid engine thermal insulation materials, in particular to a comparative assessment test device for the anti-ablation performance of a solid rocket engine thermal insulation layer. Background technique [0002] In order to improve the specific impulse and energy characteristics of propellants used in solid rocket motors, metal powders such as AL powder are 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 thermal insulation layer. Come to a bigger test. [0003] Carrying out ablation test on thermal insulation materials is a necessary means to study the ablation performance, such as oxyacetylene ablation test,...

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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