基于CFD数值模拟技术,考虑变比热容及温度对传热系数、黏性系数的影响,研究了不同二次流喷口几何构型(矩形及圆孔)在不同落压比、二次流压比等工况下,对激波矢量喷管内的三维流动特性及推力矢量性能的影响.研究表明:随着二次流压比增加,诱导激波角度增加,当诱导激波与上壁面相交时,推力矢量性能恶化;对于矩形喷口无量纲展向长度l＜ 1.0时,喷口前分离涡演变为马蹄涡,并在喷口下游诱导尾涡,SPR＞0.6时随喷口无量纲展向长度增大,推力矢量角度增加;对与多孔喷射模型,在压力缓解机理下,不同圆喷孔数量时,下壁面压力分布及壁面极限流线分布存在差异,然而圆喷孔数量对推力矢量角及推力系数的影响仍待进一步探明.
Based on CFD technology,the influence of secondary injection configuration on the 3D flow characteristic and thrust vector performance of shock vector controlling nozzle were investigated under different nozzle pressure ratios and secondary pressure ratios,taking variable specific heat ratio and temperature effect on heat transfer coefficient and viscous coefficient into consideration.Results show that induced shock angle ascends with the increase of secondary pressure ratio,and the thrust vector performance gets worse when induced shock interacts with nozzle upper wall.For rectangular injection configuration,when non-dimension slot length （l） ＜ 1.0,the separation vortex before injection slot becomes into horse vortex and would induce wake vortex.On condition of SPR＞0.6,thrust vectoring angle ascends with the increment of non-dimension slot length.For the multi-orifices injection configuration,under the drive of the pressure relief mechanism,the pressure distribution and limited streamline on nozzle down wall show diversity with different orifice numbers,however the influence of orifice numbers on the vector performance needs further study.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%