| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Experimental Investigation of Wake-Induced Bypass Transition Control by Surface Roughness |
| PAN Chong, WANG Jin-Jun**, HE Guo-Sheng |
Key Laboratory of Fluid Mechanics (Ministry of Education), Beihang University, Beijing 100191
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| Cite this article: |
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PAN Chong, WANG Jin-Jun, HE Guo-Sheng 2012 Chin. Phys. Lett. 29 104704 |
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Abstract Surface roughness is experimentally used to control the flat-plate boundary layer bypass transition induced by an upstream convected two-dimensional (2D) circular cylinder wake. It 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 elements. Significant scale reduction and localisation of these hairpins are achieved, which enhances the possibility of a hairpin self-annihilation process. Therefore, the cascade to large-scale structures in the later transition stage might be impeded/weakened.
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Received: 20 February 2012
Published: 01 October 2012
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