二次流喷射位置对流体推力矢量喷管气动性能影响的数值模拟

数值模拟了二次流喷射位置对基于激波控制的二维收-扩(2DCD)喷管的流体推力矢量气动性能,结果表明喷射位置对矢量角有较大影响,在喷管落压比NPR=4.5时,二次流喷射位置相对位于喷管发散段中部时,矢量角最大;在NPR≥7.2时,二次流喷射位置越靠近出口,矢量角越大.喷射位置对推力系数及流量系数的影响不大. 

Numerical simulation of aerodynamic effects of secondary injection positions on fluidic thrust vectoring nozzle

The aerodynamic effects on fluidic thrust vectoring of a two-dimensional,convergent-divergent(2DCD) nozzle with fluidic injection were simulated numerically,showing that different fluidic injection positions have bigger influence on the vector angle.In the case of nozzle NPR=4.5,the vector angle of secondary injection position is maximum in relation to the divergent middle section of nozzle,in the case of nozzle NPR≥7.2,the vector angle becomes bigger if the secondary injection position is closer to the outlet.The results indicate that vector angle is sensitive,and thrust coefficient and discharge coefficient are insensitive to the injection position.