Inviscid and viscous interactions in subsonic corner flows.
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.
Aerospace Science and Technology Research Centre, National Cheng Kung University, Tainan 711, Taiwan. kmchung@mail.ncku.edu.tw
Kung-Ming
KM
Chung
Po-Hsiung
PH
Chang
Keh-Chin
KC
Chang
D008962:Models, Theoretical; D014783:Viscosity