NASA Technical Reports Server (NTRS) : Application pdf

NASA Technical Reports Server (NTRS) : Application

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An aerodynamic computer code, capable of predicting unsteady and C sub m values for an airfoil undergoing dynamic stall, is used to predict the amplitudes and frequencies of a wing undergoing torsional stall flutter. The code, developed at United Technologies Research Corporation (UTRC), is an empirical prediction method designed to yield unsteady values of normal force and moment, given the airfoil’s static coefficient characteristics and the unsteady aerodynamic values, alpha, A and B. In this experiment, conducted in the PSU 4′ x 5′ subsonic wind tunnel, the wing’s elastic axis, torsional spring constant and initial angle of attack are varied, and the oscillation amplitudes and frequencies of the wing, while undergoing torsional stall flutter, are recorded. These experimental values show only fair comparisons with the predicted responses. Predictions tend to be good at low velocities and rather poor at higher velocities

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 3/1/1982
• Year: 1982
• Book Topics/Themes: NASA Technical Reports Server (NTRS), AERODYNAMIC STALLING, AEROELASTICITY, AIRFOILS, COMPARISON, COMPUTER PROGRAMS, PREDICTION ANALYSIS TECHNIQUES, WIND TUNNEL TESTS, AERODYNAMICS, ALGORITHMS, COMPUTER SYSTEMS PROGRAMS, FLUTTER, UNSTEADY AERODYNAMICS, WINGS, Muffoletto, A. J

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