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采用三维雷诺平均Navier-Stokes方程和κ-ε湍流模型对气体二次喷射推力矢量喷管复杂干扰内流场进行数值模拟.比较了在不同喷射参数和不同喷管落压比NPR(Noz-zle Pressure Ratio)下的流场特征,分析了这些参数对矢量偏转效率和推力系数的影响.结果表明,二次流喷射位置、喷射角度和二次流质量流量对矢量角的影响相互耦合,喷管达到最大矢量角时,各参数并不能同时达到各自的最优值;矢量角越大,推力系数越小,推力损失越大;矩形喷射口的推力矢量性能优于圆形喷射口;减小喷管落压比可以提高矢量偏转角度.
The three-dimensional Reynolds-averaged Navier-Stokes equations and κ-ε turbulence model were used to simulate the complex interferential flow field of gas injection secondary thrust vectoring nozzle. The effects of different injection parameters and different nozzle rejection ratios (Noz-zle Pressure Ratio, the influence of these parameters on the vector deflection efficiency and the thrust coefficient is analyzed.The results show that the effect of secondary jet injection position, injection angle and secondary flow mass vector on the vectorial angle are coupled, When the maximum vector angle is reached, each parameter can not reach the optimal value at the same time. The bigger the vector angle is, the smaller the thrust coefficient is, and the greater the thrust loss is. The thrust vector performance of the rectangle nozzle is better than that of the circular nozzle. Tube pressure ratio can increase the vector deflection angle.