Large-Scale Separation Flow Control Experiments Within the German Flow Control Network

Abstract

This is an overview on flow control experiments for flow separation control conducted in the DNW-NWB atmospheric low-speed wind tunnel performed within the German Flow Control Network. Emphasis is given on the experimental setup using the DLR F15 wall-to-wall two-dimensional high-lift model. Examples of successful flow control for enhancement of lift are given for leading edge boundary layer control and flap separation control, both by means of pulsed jet actuation. Nomenclature cp = pressure coefficient CL = lift coefficient DCe = excitation duty cycle c = retracted wing chord cF = flap chord cW = main wing chord cμ = excitation momentum coefficient fe = excitation frequency M = Mach number pe = excitation pressure Re = Reynolds number α = angle of attack δF = flap deflection angle IR = Infrared