一种前缘带锯齿的斜楔激波/边界层干扰

Shock-wave/boundary-layer interactions on wedge with sawtooth leading edge

为探究三维锯齿构型对入射激波/边界层干扰流场结构的影响,对一种前缘带锯齿的斜楔/底板流场进行数值仿真分析,并总结了不同锯齿深度对流场的影响规律.结果表明:与前缘平直斜楔相比,锯齿斜楔受溢流的影响.入射激波呈现为三波系曲面结构,激波强度减弱,波角减小,流场结构后移;底板上分离区呈现出"凹"型的空间结构,分离区展向表现为中间低、两边高,流向表现为中间短,两边长.随着锯齿深度增大,流场结构更加后移,分离区的三维特性更加明显.在溢流模型中,受侧面溢流影响,对称面处的分离最大,分离区呈现出三维的"半凹"结构;对比基准溢流模型,锯齿溢流降低了入射波系强度,使侧面溢流减少.

In order to investigate the influence of three-dimensional sawtooth configuration on the flow field structure of incident shock-wave/boundary-layer interaction,the flow field of wedge with sawtooth leading edge/plate was numerically simulated and analyzed,and the influence laws of different sawtooth depths on the flow field were summarized.The results showed that,compared with the wedge with straight leading edge,the sawtooth wedge was affected by overflow.Meanwhile,the incident shock wave presented a curved three-wave structure,the shock wave intensity was weakened,the wave angle was reduced,and the flow field structure moved backward;the separation zone on plate presented a"concave"spatial structure.The spreading direction of the separation zone was low in the middle but high on both sides,and the flow direction was short in the middle but long on both sides.With the increase of sawtooth depth,the flow field structure moved backward,and the three-dimensional characteristics of the separation zone became more obvious.In the overflow model,due to the side overflow,the separation at the symmetrical plane was the largest,and the separation zone presented a three-dimensional"semi concave"spatial structure.Compared with the original overflow model,the sawtooth overflow reduced the intensity of the incident wave system and the side overflow.