新型二维推力矢量喷管数值模拟

针对现有流体推力矢量控制方案的不足,提出利用喷流附壁效应的新型矢量喷管,借助于尾喷管射流对固壁延伸面的跟随作用控制尾喷流方向,实现推力转向.在此基础上采用限制流量的方法调节喷流的抽吸程度,产生不同的横向压力梯度,达到了矢量化控制推力转向的目的.运用这一概念设计了二维矢量喷管,用数值实验方式验证了喷管的推力转向效果,采用限制流量方法得到的最大矢量角度约13.3°,进一步结合射流控制可以使矢量偏角达到20°以上.通过对该喷管流场的数值计算研究,探讨了该矢量喷管内喷流转向形成的流动机理,从推力损失、转向效率上对喷管的性能特点进行了分析,为下一步开展实验研究奠定了基础.

Numerical simulation of a new-style 2D thrust vectoring nozzle

To exclude the inefficiency of existing fluidic thrust vectoring techniques,a new-style nozzle using ejecting mixing effects was proposed,which produced thrust vectoring by making use of the tendency of a fluid jet to be attracted to a nearby surface.The vectoring angles were manually controlled by producing different pressure gradients within the collar,where pumping effects were adjusted by flux limitation.A two dimensional nozzle was designed referring to the current idea.Thrust vectoring control was testified by numerical simulation.The maximum vector angle by flux limitation was 13.3 degree,which can be increased to 20 degree by additional steady jet.The fluidic mechanism of jet vectoring was investigated by numerical simulation,thrust loss and efficiency of the nozzle were discussed,which serves to further experimental study.