几何参数对逆流矢量喷管性能的影响研究

采用数值模拟研究了逆流矢量喷管中主要几何参数（二次流道高度G与外套管轴向长度L、横向高度C、出口边缘斜切角θ）对气动性能的影响。结果表明,L或G的增加均提高了矢量角,减少了合成推力系数,但较小的G（如0.2）更容易发生主流附体。当C=H（主喷管出口高度）时气动性能达到最佳,所对应的矢量角最大。θ对气动性能的影响较小,但对矢量角的最大值起到限制作用。

Effect of geometric parameters on performance of counterflow thrust vectoring nozzle

The effect of main geometric parameters （height of secondary flow path G, collar＇s axial length L, horizontal height C, and inclining angle 0 at the exit） on the internal performance of a counterflow vectoring thrust nozzle was studied by numerical simulation. The results show that the vectoring angle increases with the rise of L and G （1〉 0.35） , while synthesis thrust coefficient re- duces. But the smaller G （such as 0.2） leads to main flow attachment more easily. There is an opti- mal value of the internal performance while C=H （exit height of main nozzle） , which is correspond- ing to a maximum vectoring angle. 0 has less influence on the internal performance of the nozzle, however it can restrict the maximum vectoring angle.