Abstract: In order to find the effects of different Ma of the external flow on the performance and structure of internal flow field of counterflow thrust vectoring nozzle, referring to the experiment, numerical simulation was applied to study the flow field, vectoring angle and mass flux ratio of secondary flow under different Ma(0~1.5). The results show that, as the Ma increases from 0to 0.8, the flow filed in the nozzle changes so as to change the difference of pressure across the primary flow, resulting in the vectoring angle decrease, and the mass flux ratio of secondary flow will increase quickly. As the Ma increases from 0.8to 1.5, both the flow filed and the vectoring angle have no change, and the mass flux ratio of secondary flow will increase slowly. 

Key words: Counterflow thrust vectoring; Impact of external flow; Mach number; Numerical simulation

摘要： 为了研究外流马赫数变化对逆流推力矢量喷管内部流场结构和性能特点的影响,参考实验,数值模拟了不同马赫数下的流场结构、喷管矢量角和逆向二次流质量流量系数。结果表明:外流马赫数从0增加到0.8的过程中,喷管内流场结构会随着外流马赫数的增大而不断变化从而改变主流两侧压力差,进而导致矢量角逐渐减小,与此同时二次流质量流量系数快速增大；外流马赫数从0.8增大到1.5的过程中,流场结构和矢量角随马赫数变化没有明显变化,二次流质量流量系数缓慢增大。 

关键词: 逆流推力矢量;外流干扰;马赫数;数值模拟 