基于次流喷射控制推力矢量喷管的实验及数值研究

A Study on the Two-Dimensional Thrust Vectoring Nozzle with Secondary Flow Injection

应用实验和数值模拟的方法 ,对一种新型的推力矢量喷管—基于次流喷射控制的二维推力矢量喷管的推力矢量性能和流场进行了研究。实验是在西北工业大学小型超高速吹气式风洞中进行 ,测量了在不同的二次喷流情况下 ,推力矢量和流场的变化规律 ;采用时间推进求解 N-S方程的方法数值模拟了二维推力矢量喷管内流场和性能。研究结果表明 ,应用次流喷射控制主流流动可以实现较大的推力矢量转折 ,但是 ,二次喷流必须具有足够的压力值 ;如何从推力矢量工作方式恢复到轴向流动工作方式则是需要进一步研究的问题。

The new type of two-dimensional thrust vectoring nozzle with the secondary flow injection was studied by using experimental method and CFD method. The experiments were finished in a supersonic wind tunnel in NPU. The wall pressure and the thrust vector angle were measured for the different secondary flow pressure under the constant main flow pressure. The flow field and performance of the nozzle were also analyzed by the computation of Reynolds averaging N-S equations with the time marching finite volume method. The computed results were compared to experimental data in a good agreement. Both the experimental and computational results showed that the pressure of secondary injection flow should be large enough to create a vectoring thrust. In our case the threshold ratio of the total pressure of the second flow to that of main flow was 0.32 and the maximum deflection of the thrust vector was 46°.