Active Flow Separation Control on a High-Lift Wing-Body Configuration Part 2: The Pulsed Blowing Application

Abstract

This contribution discusses the implementation of active flow separation control for a 3D high-lift wing-body configuration under atmospheric low-speed wind tunnel conditions. The slot-actuators are applied on the suction side of the trailing edge flap to prevent local flow separation. It is the consequent progression of the work presented in Part 1 of this paper. The active flow control (AFC) method of choice is now the pulsed blowing. The experimental results indicate that this AFC technique is feasible for such applications with a global performance enhancement. Here, the wind tunnel findings are briefly discussed while the emphasis is given on the numerical investigations. The verification of the URANS approach points out that the global enhancement through AFC may easily be overestimated by insufficient numerical convergence. Thus, high computational requirements are needed for a consistent numerical evaluation. The computational results highlight the ability of pulsed blowing at moderate blowing momentum coefficients to suppress the flow separation on the trailing edge flap and support the global aerodynamic enhancement. The numerical results show an acceptable agreement with the experimental results for this AFC application.