Numerical analysis of start-up transient process of rbcc embedded rocket under non-normal operating conditions

Rocket based combined cycle propulsion system integrates the rocket engine with high thrust ratio and the ramjet with high impulse into the same first-class channel. In this paper, the transient process of a two-dimensional rocket based combined cycle propulsion system model with gaseous kerosene fuel at the moment of opening the embedded rocket is analyzed by numerical simulation, when it is not in the normal steady flight of fire or flameout at the different altitudes. Open the embedded rocket with products of combustion and extra fuel in the shear layer obviously exist combustion domain; In the model, the high altitude state still exists in the combustion chamber of the Ramjet, Opening small rockets, the change of flow field is aggravating the mixing state of fuel and air, which makes the stamping main burning zone return to normal working state, and by analyzing the dynamic characteristics of transient process, the influence tendency of flight altitude on thrust is found.