抄録
Flow visualization and surface pressure measurements have been conducted on a 45º delta wing in roll to examine their nonlinear characteristics of rolling moment that cause self-induced oscillations in a post-stall state. These flow patterns were analyzed by comparing with the results of static aerodynamic force measurements. At a roll angle of around 75deg, the flow pattern changes from separated to attached flow with a separation bubble, which is considered to make a critical state in the characteristics of rolling moment, where energy is supplied to the self-induced oscillation process.
