The Aeroelastic Analysis of a Two-Dimensional Airfoil in Transonic Flow.

Abstract

Abstract : A procedure is developed for the aeroelastic analysis of a two-dimensional airfoil in transonic flow. The fluid is assumed to be described by the unsteady low frequency small disturbance transonic potential equation for which a fully time implicit method of integration (LTRAN2) exists. Structural equations of motion for a three degree of freedom NACA 64A010 airfoil are integrated in time simulataneously with the unsteady potential equation using representative values of the structural parameters. The method is shown to be both stable and accurate, and the time response for several choices of initial conditions and reduced freestream density is presented. Oscillations with either increasing or decreasing amplitudes are found to result solely from the choice of initial conditions. (Author)