比热变化对激波诱导气动矢量喷管影响的数值研究

Effect of Variable Specific Heat on Shock Vectoring Nozzle

采用基于雷诺平均的二维Navier-Stokes方程和RNGκ-ε湍流模型的有限体积法,考虑比热随温度的变化,对激波诱导气动矢量喷管的流动情况和性能进行了数值仿真研究。结果表明:与平均定比热计算相比,变比热计算的喷管流动情况发生了较大变化,激波位置前移、激波强度减弱、喷管出口气流平均速度增大;进一步分析发现,与平均定比热计算相比,变比热计算的喷管推力系数、推力矢量角、推力矢量效率均有所增大。

Flow fields of 2 - D shock vectoring nozzle are calculated by the finite volume method based on 2D Reynolds average Navier - Stokes equations, RNG turbulent model and considering the variation of specific heat at different temperature. The results show that there has been some changes of the nozzle flow fields such as upper moving of the shock wave, the abatement of the shock wave amplitude and the increase of the velocity of the nozzle outlet compared with the calculation of constant specific heat. By further analyzing, the thrust coefficient, the thrust vectoring angle and the vectoring effectiveness all have increased in contrast between the variable specific heat calculated results and the constant specific heat numerical results.