Visualization of Görtler vortices in supersonic concave boundary layer
Visualization of Görtler vortices in supersonic concave boundary layer
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DOI：
10.1007/s12650-017-0443-5
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发表时间：
2018-02
影响因子：
1.7
通讯作者：
Qian-cheng Wang;Zhenguo Wang;Yu-xin Zhao
中科院分区：
文献类型：
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作者：
Qian-cheng Wang;Zhenguo Wang;Yu-xin Zhao
摘要采用基于纳米颗粒的平面激光散射技术，在来流马赫数为2.95的条件下，对曲率半径分别为113和908 mm的两个凹壁上形成的边界层进行了可视化。清晰地捕捉到了Görtler涡的形成和破碎过程，这是以前在超声速条件下很少做过的。与不可压情况不同，超声速边界层中Görtler涡的破裂主要归因于变模态不稳定性。Görtler涡不是静止的，而是沿展向运动。图形摘要
AbstractBy employing a nanoparticle-based planar laser scattering technique, with inflow Mach number of 2.95, boundary layers formed over two concave walls with respective curvature radii of 113 and 908 mm are visualized. The formation and the breakup process of the Görtler vortices have been clearly captured, which has seldom been done before under the supersonic condition. Different from the incompressible case, the breakup of the Görtler vortices in the supersonic boundary layer is found to be mainly attributed to the varicose mode instability. The Görtler vortices are not stationary, instead they are moving in the spanwise direction.Graphical abstract