Further analysis of high-rate rolling experiments of a 65-deg delta wing

Abstract

Further analyses have been performed of the experimental results obtained in the roll oscillation tests of a 65-deg sharp-edged delta wing at 30-deg inclination of the roll axis in order to uncover the fluid mechanical phenomena causing the unusual, highly nonlinear vehicle dynamics. It was found in an earlier analysis that in addition to the expected effect of convective flow time lag, the test results show highly nonlinear effects on vortex breakdown of the oscillatory rate. The present analysis reveals that these effects are themselves influenced by convective flow time lag. As a result, the past time history of the oscillatory response can in some cases have a strong influence on the final trim condition.