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Shock Wave Boundary Layer Interaction Control by Rod Vortex Generators

机译:棒涡发生器产生的冲击波边界层相互作用控制

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The results presented here provide new insight into the flow behavior in the presence of streamwise vortices generated by the rods. The following conclusions can be drawn from the above described experimental investigations: - Streamwise vortices cause a pressure recovery improvement downstream of the shock wave, which show a tendency towards reduction of separation. - The vortices cause the entrainment of higher momentum fluid into the lowest strata of a boundary layer which counteracts separation and helps to reduce the height of the λ-foot. - The separation size is significantly reduced by streamwise vortices generated by the rods. - The flow pattern becomes asymmetric when the corotating streamwise vortices are introduced into the flow. - The streamwise vortices pass under the shock wave and the shock does not disintegrate the vortices. The streamwise vortices stretch downstream of the shock wave. - For the flow with vortex generator there is no continued separation in the spanwise direction and the vortices cut the separation on small, cell-like, 3D structure with a pitch corresponding to a VG sequence. - The rod vortex generator does not affect the flow unsteadiness in the interaction area; RMS and mean amplitude of shock oscillations are very similar to those in the reference flow.
机译:此处提供的结果提供了对由棒产生的涡流存在下的流动行为的新见解。从上述实验研究中可以得出以下结论:-沿流方向的涡流导致冲击波下游的压力恢复得到改善,这表明分离趋势有所降低。 -涡流将较高动量的流体夹带到边界层的最低层中,这抵消了分离并有助于减小λ脚的高度。 -棒产生的沿流方向的涡流显着减小了分离尺寸。 -当同向流动的涡流引入流中时,流型变得不对称。 -涡流在冲击波的作用下通过,而冲击不会使涡流解体。流向涡流在冲击波的下游延伸。 -对于带有涡流发生器的流,在翼展方向上没有连续的分离,并且涡流在间距为VG序列的小,蜂窝状3D结构上切开了分离。 -棒状涡旋发生器不会影响相互作用区域内的流动不稳定;冲击振荡的RMS和平均幅度与参考流中的非常相似。

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