针对轴对称喷管,利用数值方法研究了其出口形成的气动喉道的控制射流参数对喷管推力系数的影响。计算结果表明：射流控制能在喷管出口处形成气动喉道,即所研究喷管成为新型的固-气双喉道喷管,减小了喷管的有效出口面积,使其膨胀更完全,从而能够有效增大过膨胀喷管的推力系数。同时,射流角度对喷管出口实际面积和流场有一定的影响,顺向射流能获得更好的增推效果。%The effect of the fluidic injection parameters of gas throat at the outlet on axisymmetric nozzle thrust coefficient were investigated by the numerical method. The results show that the fluidic injection creates a gas throat at the outlet of nozzle, it can be called solid-gas dual throat nozzle which can reduce the outlet area effectively, and improve the expansion of nozzle. The fluidic injection can raise the thrust ratio of over expansion nozzle effectively. The injection angle influences the real outlet area and flow of the nozzle, the forward injection can get the better thrust improvement.
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