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ScientificWorldJournal. 2013 Jun 27;2013:940862. doi: 10.1155/2013/940862. Print 2013.

Inviscid and viscous interactions in subsonic corner flows.

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Aerospace Science and Technology Research Centre, National Cheng Kung University, Tainan 711, Taiwan.


A flap can be used as a high-lift device, in which a downward deflection results in a gain in lift at a given geometric angle of attack. To characterize the aerodynamic performance of a deflected surface in compressible flows, the present study examines a naturally developed turbulent boundary layer past the convex and concave corners. This investigation involves the analysis of mean and fluctuating pressure distributions. The results obtained indicate strong inviscid-viscous interactions. There are upstream expansion and downstream compression for the convex-corner flows, while the opposite trend is observed for the concave-corner flows. A combined flow similarity parameter, based on the small perturbation theory, is proposed to scale the flow characteristics in both subsonic convex- and concave-corner flows.

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