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An experimental investigation of the reduced frequency effects into pressure coefficients of a plunging airfoil
, Article 7th International Conference on Advances in Fluid Mechanics, AFM'08, The New Forest, 21 May 2008 through 23 May 2008 ; Volume 59 , 2008 , Pages 153-161 ; 17433533 (ISSN); 9781845641092 (ISBN) ; Ajalli, F ; Soltani, M. R ; WIT Transactions on Engineering Sciences ; Sharif University of Technology
2008
Abstract
Aerodynamic coefficients on a two dimensional plunging airfoil, in a low-speed wind tunnel are presented. Dynamic motion was produced by plunging the model over a range of reduced frequencies, and mean angles of attack. The Reynolds number in the present test was held fixed (Re = 1.5×10 5), and the reduced frequency was varied in an almost wide range. Surface static pressure distribution was measured on the upper and lower sides of the model, during the oscillating motion. It was found that reduced frequency had strong effects on the pressure distribution, near the leading edge of the airfoil. For mean equivalent angles of attack of 0, 5 degrees, hysteresis loops on the upper surface of the...