Subcritical Flutter Characteristics of a Swept-Back Wing in a Supersonic Flow

摘要

The purpose of this paper is to investigate subcritical flutter characteristics of a cantilever swept-back wing in a turbulent supersonic flow using computer simulation. This is a counter-part analysis for the nonstationary experiment made by one of the authors in a previous study. Comparison between the analysis and the experiment shows that the variance of Jury's stability parameter estimated from a very short time record decreases monotonically toward zero as the dynamic pressure approaches the flutter boundary, whereas the variance of the damping estimated with the same condition remains large. The flutter boundary is predictable by the intersection of the upper straight line of an envelope enclosing the scattered values of Jury's stability parameter F~-(3) with the horizontal coordinate. The flutter prediction based on Jury's stability parameters is more effective in practical application than the conventional damping method.