Effects of roughness elements on bypass transition induced by a circular cylinder wake

被引：9

作者：

Wang, J. J. ^{[1
]}

Zhang, C. ^{[1
]}

Pan, C. ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Fluid Mech Key Lab, Educ Minist, Beijing 100191, Peoples R China

来源：

JOURNAL OF VISUALIZATION | 2011年 / 14卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Bypass transition; Roughness elements; Wake; Hairpin vortex; PLATE BOUNDARY-LAYER; STREAMWISE VORTICES; GROWTH; STREAKS; WAVES;

D O I：

10.1007/s12650-010-0063-9

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

The bypass transition of flat-plate boundary layer induced by a circular cylinder wake under the influence of roughness elements is experimentally investigated. The hydrogen-bubble visualization results show that the boundary layer separation occurs upstream of the roughness, and the separated shear layer is incised by roughness to different extent, resulting in different kinds of secondary vortices formed immediately downstream of the roughness. During the evolution of the secondary vortex, two types of instabilities are observed, which are denoted as large-and small-scale instabilities, respectively, according to different spatial scale of the hairpin vortices formed afterward. A merging process of hairpin vortices is also observed when the secondary vortices undergo the small-scale instability, and a potential new transition control strategy based on the present observation is proposed.

引用

页码：53 / 61

页数：9

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