基于康达效应的高速气流推力矢量喷管

High-speed thrust vector nozzle based on Coandăeffect

基于康达效应设计了一种高速气流推力矢量喷管,利用其对流体的偏转作用实现主流方向控制。喷管由主通道以及外侧八个独立气室和出口处的康达壁面组成,可通过气室外部的开合情况来实现八个偏转方向的控制。本文对所设计的高速气流推力矢量喷管进行了仿真计算,研究了主流速度、气室开合情况及康达壁面曲率三个参数对主流偏转效果的影响。数值模拟结果表明:(1)主流速度在50~160 m/s时,不同的开合组合的偏转效果有较为显著的差异。(2)气室打开数量为奇数时,偏转效果优于偶数。只有一个气室开口时,偏转效果最优。(3)计算得到三维喷管最优康达壁面的曲率是55.26。本文设计的高速气流推力矢量喷管能够达到较好的偏转控制效果,最大偏转角度可达到85.91°。

In this paper,a high-speed thrust vector nozzle is designed based on the Conda effect to realize the mainstream direction control by its deflecting effect on the fluid.The nozzle design is composed of the main passage,eight independent gas chambers on the outside and a Coandăwall at the exit.Eight deflection directions can be controlled through the switching condition of the outdoor part of the gas.In this paper,the numerical simulation method is used to simulate the designed high-speed thrust vector nozzle.The influence of the three parameters of the mainstream velocity,the opening and closing of the gas chamber,the change of the curvature of the Coandăwall on the mainstream deflection effect is explored.Numerical simulation results show that:(1)When the mainstream speed is between 50~160 m/s,the deflection effect of different switch combinations is significantly different.(2)When the number of air chamber openings is odd,the deflection effect is better than even.When there is only one air chamber opening,the deflection effect is optimal.(3)The curvature of the optimal Coandăwall of the three-dimensional nozzle is 55.26.The high-speed thrust vector nozzle designed in this paper can achieve better deflection control effect,and the maximum deflection angle can reach 85.91°.