Characteristics Of Fluidic Throat Vector Nozzle About Solid Rocket Engine

In order to improve the maneuverability and penetration ability of missile, as the power unit, engine is demand to be provided with the ability of thrust control, especially the thrust stochastic control function. Thrust control technology is one of the important research fields of solid rocket motors. Compared with the reserve thrust engine(eg. single room double thrust and impulse engine etc.), the former is better at allocating propellant energy. According to the work conditions, we need to adjust its thrust, which is the development trend of solid rocket motors. Realizing stochastic control of thrust will be a breakthrough of solid rocket motor technology.Fluidic vector nozzle is the combination of the fluidic nozzle throat and the shock wave induced vector technology, which realize the real-time adjustment of thrust size and direction. The concept of "Fluid nozzle throat" is the interaction between mainstream and secondary flow by injecting secondary flow, which change the shape of throat and the circulation area(fluid injection method). Secondary fluid is reverse injected into the mainstream near the throat, which extrude the mainstream and increase the flow resistance that make the mainstream flow area reduce. Adjusting the secondary flow working substance parameters can realize the control of mainstream throat area size. Shock wave induced technology means injecting asymmetric secondary flow at nozzle divergent section, which make shock wave, induce the mainstream deflectionThe main content of my study is the general rules of the combination of Fluidic nozzle throat technology and shock wave induce technology as well as flow field characteristic of throat. By combining the numerical simulation with cold flow and thermal test, we can gain the relationship between effective throat area in fluidic vectored nozzle throat and flow ratio of the secondary flow and mainstream, as well as the influence of different injection solutions on the thrust vector. At the seam time, we can obtain the flow characteristics of gas-liquid two phase flow in nozzle. By testing and verifying the reliability of numerical simulation, we can provide a reference for the engineering application of fluid vectored nozzle throat.