文中利用数值模拟方法研究了落压比对射流控制矢量喷管流动和性能的影响,分析了喷管矢量角随落压比变化的机理。研究结果表明,随着落压比增大,矢量角减小;注气口下游分离区内的压力降低,上下壁面的压差减小,矢量角减小;喷管工作状态从过膨胀状态向欠膨胀状态转变,压差产生的推力越来越大,喷管的矢量角和气流偏转角相差越来越大,矢量角越来越小。

A computational study was conducted to investigate the effect of nozzle pressure ratio on flow filed and performance in a fluidic thrust vectoring nozzle. The results indicate that with the increase of nozzle pressure ratio, the thrust vector angle decreases. The shock wave in front of injection moves downstream, therefore the pressure difference of upper and lower wall decreases, and thrust vector angle decreases; With the separated flow region pressure of injection downstream decreases, the pressure difference of upper and lower wall decreases, thus thrust vector angle reduces; With operational condition changes, the difference between thrust vector angle and flow deflection angle increases, and the thrust vector angle decreases.