Experimental Investigation of Wake-Induced Bypass Transition Control by Surface Roughness
作者机构：Key Laboratory of Fluid Mechanics(Ministry of Education)Beihang UniversityBeijing 100191
出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)
年 卷 期：2012年第29卷第10期
页 面：120-124页
核心收录：
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
基 金：Supported by the National Natural Science Foundation of China under Grant Nos 10832001 11002015
主 题：process roughness Transition
摘 要：Surface roughness is experimentally used to control the flat-plate boundary layer bypass transition induced by an upstream convected two-dimensional(2D)circular cylinder *** is shown that the later stage of this bypass transition is successfully postponed,at the price of accelerating the earlier transition stage.A regularisation process of the hairpin vortices,which are the dominant coherent structures to promote the transition process,are observed under the influence of roughness *** scale reduction and localisation of these hairpins are achieved,which enhances the possibility of a hairpin self-annihilation ***,the cascade to large-scale structures in the later transition stage might be impeded/weakened.
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