Abstract
In the present study, we conducted wind tunnel test of simplified vehicle model that show hysteresis of aerodynamic drag during a transient change of aerodynamic yaw angle. Under some conditions where aerodynamic yaw angle fluctuates continuously, time-averaged aerodynamic drag of the simplified vehicle model changed significantly from the quasi-steady evaluation. This time-averaged drag change was considered to be mainly caused by the hysteresis of aerodynamic drag. Based on the time-series measurement of base pressure distribution, we indicated the strong relationship between the drag hysteresis and the variation of flow separation point on the model’s rear-end corner at the leeward side.
