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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。
Aiming at the axisymmetric nozzle, the effect of the control jet parameters of the pneumatic throat formed by the outlet on the thrust coefficient of the nozzle was studied by numerical method. The calculated results show that the jet control can form a pneumatic throat at the outlet of the nozzle, that is, the nozzle under study becomes a new type of solid-gas dual-throat nozzle, reducing the effective outlet area of the nozzle and expanding it more completely, Which can effectively increase the expansion coefficient of thrust nozzle. At the same time, the jet angle has certain influence on the actual area and flow field at the outlet of the nozzle, and the forward jet can obtain a better push-push effect.