The Design and Numerical Simulation Study of Gas Generator Sealing Device

摘要

This paper puts forward a new design proposal aiming to solving the propellant sealing problem of the gas generator in the process of storage and flight of the Dual Inlet Side Dump solid rocket ramjet engine.RNG κ - ε turbulent model has been employed to the numerical simulation of the transient internal flow field of the solid rocket ramjet engine before ignition in flight.This paper also provides an analysis of the influence of flow field structure on the temperature of the sealing material and makes calculation on the thermal conduction of the two kinds of sealing material based on the results of flow field calculation.Results show that the sealing material is largely influenced by the temperature of the air in the inlet piping before ignition,with the surface temperature of the sealing material gradually rising as the engine working time increases;different air inlet angle results in different rising time of the surface temperature of the sealing material ,the larger the air inlet angle,the earlier the rising time;the temperature within the sealing layer assumes an linear distribution and decreases through the layer,and the sealing layer has no influence on the normal ignition of the engine,therefore,it has considerable engineering reference value for its operating reliability and simple structure.