Research on Structure and Performance of Shock Wave Control Vector Nozzle Flow Field

The flow field and the operating characteristics of a shock wave control vectoring nozzle have been investigated with a numerical simulation method.The influence of flow,external flow Mach number and pressure ratio on nozzle has been studied.The results show that with the increase of the secondary flow,it has more interference on the mainstream,making the upstream of gas injection port with a higher pressure,the differential pressure between upper and lower surface raise,and thrust vector angle increases.If the secondary flow was too big,it would have an impact on the lower surface and reduce the performance.With the increase of Mach number,the pressure of nozzle exit was reduced,so did the pressure of upper surface.The pressure between upper and lower surface decreased,thus reducing the performance of thrust vector nozzle.As the NPR increased,the separation shock in front of gas injection port moved backward,making the downstream separation of gas injection port with a lower relative pressure,so the pressure between upper and lower surface decreased,and the performance of thrust vector nozzle decreased.On the other side,the work state of nozzle changed from higher expansion to lower expansion of the state,so the thrust changed with pressure increased,and the performance of thrust vector nozzle decreased.