Apparatus for simulating insulation ablation under condition of particle deposition in cavity in back wall of submerged nozzle

Abstract

The invention discloses an apparatus for simulating insulation ablation under the condition of particle deposition in a cavity in a back wall of a submerged nozzle, which belongs to the technical field of rocket engines. The apparatus comprises a combustion chamber; one end of the combustion chamber is sealed, the other end of the combustion chamber is respectively in horizontal communication with a transition pipe and a deposition chamber from top to bottom, and the transition pipe is coaxially communicated with a channel pipe and a jet pipe in sequence; a propellant and an ignition cartridge bag used for igniting the propellant are arranged in the combustion chamber; and one end of the deposition chamber is communicated with the combustion chamber so as to form a through cavity, the other end of the deposition chamber is hermetically arranged, and the bottom inner wall and / or the inner wall of the sealed end of the deposition chamber is provided with an insulation test piece. The apparatus provided by the invention can directly simulate the flowing state of particles in the cavity in the back wall of the submerged nozzle of a large solid rocket engine and realizes research on the mechanism of insulation ablation under the condition of condensed-phase particle deposition.

Description

technical field [0001] The invention belongs to the technical field of rocket engines, and in particular relates to a thermal insulation layer ablation simulation device under the condition of particle deposition in the cavity of the back wall of a submerged nozzle. Background technique [0002] In the design of modern solid rocket motors, in order to increase the specific impulse and shorten the overall length of the engine, metal powder (such as Al, Mg) is usually added to the propellant, and submerged nozzles are widely used, and solid rocket motors using aluminum-containing propellants and submerged nozzles , when the propellant burns, condensed droplets formed by melting aluminum powder are produced on the surface of the propellant. These aluminum droplets either flow along the surface of the grain and the wall of the shell, or are injected into the high-speed rotating gas flow. However, during the working process of the engine, a cavity is gradually formed in the area ...

AI Technical Summary

Problems solved by technology

However, the experimental technology of thermal insulation layer ablation under the condition of aluminum oxide particle deposition is rarely mentioned in the domestic literature, especially for the simulation of the particle flow state in the cavity of the back wall of the large solid rocket motor submerged into the nozzle, and the thermal insulation layer ablation under the condition of condensed phase particle deposition. The research on the corrosion mechanism is rarely mentioned

Images