一种新型双射流双喉道控制矢量喷管的数值模拟

Numerical simulation of a novel dual-injection dual-throat vectoring nozzle

双喉道控制矢量喷管具有良好的推力矢量性能。为了进一步提高双喉道控制矢量喷管的性能,提出一种双射流双喉道矢量喷管的设计概念。在喷管的第二喉道处上壁面增加一个射流通道,给主流提供径向速度的同时也降低推力损失,既能增大推力矢量角,又能获得较大的推力系数。对该喷管二次射流设计参数进行数值模拟,结果表明:二次射流流量比、入射角度都会对喷管的内部流态造成直接影响,从而影响推力矢量角、推力系数。由此方法得出的最佳推力矢量性能为:最佳推力矢量角为16.5°时,相对应的推力系数为96.7%。

Dual-throat vectoring nozzle has a good vectoring performance.In order to further improve the performance of the dual-throat vectoring nozzle,a design concept of dual-injection dual-throat vectoring nozzle was proposed.An injection was added to upper wall of the second throat to provide the radial velocity while reducing thrust loss,which could not only increase the thrust vector angle but also obtain a larger thrust.Design parameters of the secondary injection of the nozzle were numerically simulated.The results show that,flow rate and incident angle of the secondary injection directly affected internal flow pattern of the nozzle,thereby affecting thrust vector angle and thrust coefficient.The best thrust vector performance obtained by this method in this paper was that the thrust vector angle of 16.5°and the corresponding thrust ratio of 96.7%.