The Two-Dimensional Oscillating Airfoil in a Wind Tunnel in Subsonic Flow

Abstract

A method is developed for computing the forces acting on an oscillating two-dimensional airfoil in a wind tunnel in subsonic compressible flow. The cases of closed, open, and ventilated tunnel walls are considered. The method is exact in that it provides a complete solution to the linearized mathematical model of the problem. The partial differential equation for the pressure potential is solved by an integral transform technique. This leads to an integral equation relating the known oscillatory motion of the wing to the unknown pressure acting on it. A numerical method is presented for the solution of this integral equation.