Hypersonic transition induced by three isolated roughness elements on a flat plate!
Hypersonic transition induced by three isolated roughness elements on a flat plate!
复制标题
平板上三个孤立的粗糙度单元引起的高超声速转变
DOI：
10.1016/j.compfluid.2017.08.006
复制
发表时间：
2017-11-03
影响因子：
2.8
通讯作者：
Xiao, Zhixiang
中科院分区：
文献类型：
--
作者：
Duan, Zhiwei;Xiao, Zhixiang
基于有限体积法和高阶MDCD格式，对三种孤立粗糙元（斜坡、菱形和圆柱）诱导的高超声速边界层从层流到湍流的转捩进行了直接数值模拟.定量比较了粗糙度形状对转捩机理、气动性能和气动热力性能的影响。过渡是由三维剪切层不稳定性和流向过渡的位置是几乎相同的所有三个粗糙度元素。圆柱体的尾迹宽度、阻力增量和热流密度最大。同时，湍流尾流最弱，阻力和热通量最低。(C)2017由Elsevier Ltd.出版
Hypersonic boundary layer transition from laminar to turbulent induced by three isolated roughness elements (ramp, diamond, and cylinder) was investigated by direct numerical simulations based on finite volume formulation with high order MDCD scheme. The effects of roughness shape on the transition mechanism, aerodynamic and aero-thermodynamic performances were quantitatively compared. The transition is dominated by three-dimensional shear layer instability and the streamwise transition locations are almost the same for all three roughness elements. The width of turbulent wake, the drag increment and the heat flux are the largest for cylinder. At the same time, the turbulent wake is the narrowest and drag and heat flux are the lowest for the ramp. (C) 2017 Published by Elsevier Ltd.