几何构型对逆流推力矢量喷管特性影响

采用数值模拟方法研究了几何构型对逆流推力矢量喷管内部流动结构及性能的影响.研究结果表明:主流未附体时,增大缝宽可提高推力矢量角,但同时却降低了合成推力系数,抽吸二次流流向由同向转变为逆向且流量逐渐增大;增大斜切角可致使推力矢量角减小,合成推力系数先增大后减小.随着斜切角的增大,抽吸二次流流向由逆向逐渐转变为同向二次流,流量比在2%以内,且呈先减小后增大趋势.

Geometric configuration on the performance of counterflow thrust vectoring nozzle

Numerical simulation was applied to study internal flow structure and performance of counterflow thrust vectoring nozzle with geometric configuration. Results indicate that thrust vectoring angle increased with the increasing of slot height and terminal angle when the jet was not attached to the collar, while resultant thrust ratio decreased. Suction second flow shifted from coflow to counterflow, while the mass flow rate increased. The thrust vectoring angle decreased with the increase of terminal angle; resultant thrust ratio firstly increased but then decreased. During the procedure of increasing terminal angle, suction second flow shifted from counterflow to coflow, and mass flow rate was less than 2%, but decreased and then increased.