Numerical Simulation of Dynamic-Stall Suppression by Tangential Blowing

摘要

The use of tangential blowing to suppress the dynamic stall of a pitching airfoilis investigated numerically. The laminar two-dimensional, compressible Navier-Stokes equations are solved time-accurately using a Beam-Warming algorithm. A slot is located at four different positions along the surface of a NACA 0015 airfoil and air is injected in a nearly tangential sense along the upper surface. Suction control is also employed at one of these slot locations to directly compare with tangential-blowing control. Solution sensitivity to grid refinement, time-step size, numerical smoothing, and initial conditions is investigated at a Reynolds number of 2.4 x 10(exp 4). Initial-condition and initial-airfoil-acceleration effects are analyzed for various pitch rates. Compressibility of M infinity = 0.2 solutions is investigated. Numerical simulation uncertainties of jet-orientation angle and jet velocity profile are investigated. Studies are conducted to establish the effects of slot position, slot width, blowing-initiation angle, blowing velocity, pulsed blowing, and blowing at different pitch rates. Computational fluid dynamics, Dynamic stall, Control, Tangential blowing, Navier-stokes equations, Compressible flow, Laminar flow.