基础(线性代数)
图层(电子)
表面粗糙度
边界层
表面光洁度
边界(拓扑)
计算机科学
材料科学
几何学
物理
机械
数学
数学分析
复合材料
作者
Mitsutomo Hirota,Yuki Ide,Yuji Hattori
摘要
As an laminar flow control device for delaying the crossflow-induced transition of three-dimensional boundary layer, sinusoidal roughness elements (SREs) are placed in a Falkner-Skan-Cooke boundary layer and the resultant laminarizing effect is numerically investigated in comparison with discrete roughness elements (DREs). Since SREs are designed to avoid flow tripping, the critical height of SREs is much higher than that of DREs. Moreover, the wake flow behind SREs efficiently generates and sustains crossflow vortices that are not dangerously unstable against secondary instabilities but able to strongly distort the mean crossflow profile into a less unstable one. By measuring this mean flow distortion by SREs and DREs, the laminarizing effect is compared among them. It is shown that the effect of SREs is higher than that of DREs and can be enhanced by choosing the appropriate height, angle and wavelength depending on the local boundary layer profile.
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