摘要
对一二元收扩激波诱导矢量喷管进行了二维动态数值模拟,研究了不同落压比、不同次流加速时间下,喷管气动特性和流场结构随次流增加的变化规律。结果表明:喷管在过膨胀状态下,次流流量达到一定值时,其推力会有较强的振荡;在完全膨胀和欠膨胀状态下,振荡较小。其原因是,次流增加过程中,喷管出口附近有复杂波系存在和回流产生,而回流对提高推力和增加矢量角有益。
2D dynamic numerical simulation of a shock vector controlled 2D-CD exhaust nozzle was con-ducted to investigate the effect of increasing secondary mass flow on the internal nozzle performance andflow field structure under different nozzle pressure ratios. Results indicate that when the secondary massreaches a certain value, the thrust of nozzle will undergo a strong oscillation when nozzle is under over-ex-panded condition. The oscillation will be much weaker when nozzle is under either fully expanded or un-der-expanded conditions. This phenomenon is attributed to a series of complex waves near the nozzle outletand the emergence of back flow. It is also concluded that back flow can enhance the performance of nozzleand enlarge the vector angle.
出处
《燃气涡轮试验与研究》
北大核心
2014年第5期30-37,共8页
Gas Turbine Experiment and Research
关键词
航空发动机
射流推力矢量喷管
激波诱导
动态
数值模拟
aero-engine
fluidic thrust vectoring control
shock vector control
dynamic
numerical simulation
