Characteristics of Fluidic Axisymmetric Thrust-vectoring Nozzle without Injection

To improve the thrust efficiency of the nozzle at over expanded condition(NPR≤3.5) without injection flow,the effect of the injection slots on primary flow has been studied by numerical simulation.The results indicate that the cavity flow over injection slots can change the flow separation position on the nozzle wall and increase the thrust efficiency at low NPR(nozzle pressure ratio).The thrust efficiency of the nozzle can be improved over 0.90.So To set the connected injection slots reasonably can improve the thrust efficiency with injection or without injection at low NPR.