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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Increasing Lift by Means of Active Flow Control on the Flap of a Generic High-Lift Configuration
verfasst von : R. Petz, W. Nitsche, M. Schatz, F. Thiele
Erschienen in: New Results in Numerical and Experimental Fluid Mechanics V
Verlag: Springer Berlin Heidelberg
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This paper demonstrates the use of active separation control on a high-lift configuration in order to enhance the aerodynamic performance in terms of lift and drag. The aim is to delay boundary layer separation on the flap’s upper surface by periodic excitation using a pulsed wall jet The experimental and numerical results show a massive improvement of almost all aerodynamic coefficients over a wide range of angles of attack and flap deflection angles. By actuating with correct excitation parameters, the jet formed by the single slotted flap can be reattached or kept attached, depending on the conditions, to the surface. Lift is increased by up to 12% while drag is reduced by the same amount. As a result, the lift to drag ratio defining the aerodynamic quality is improved by up to 25%. A numerical calculation on the basis of unsteady Reynolds-averaged Navier Stokes equations is also presented to determine the influence of different excitation parameters.