FURTHER ANALYSIS OF HIGH-RATE ROLLING EXPERIMENTS OF A 65-DEG DELTA-WING

Further analyses have been performed of the experimental results obtai ned in the roll oscillation tests of a 65-deg sharp-edged delta wing a t 30-deg inclination of the roll axis in order to uncover the fluid me chanical phenomena causing the unusual, highly nonlinear vehicle dynam ics. It was found in an earlier analysis that in addition to the expec ted effect of convective flow time lag, the test results show highly n onlinear effects on vortex breakdown of the oscillatory rate. The pres ent analysis reveals that these effects are themselves influenced by c onvective flow time lag. As a result, the past time history of the osc illatory response can in some cases have a strong influence on the fin al trim condition.