Abstract
Aerodynamic forces generated on a three-dimensional bluff-body with a slanted base, have been experimentally investigated in a low-speed wind tunnel. The Reynolds number based on the whole length of the model, ranged from 1 × 106 up to 2.76 × 106. In order to clarify the cross-wind effect, yaw-sweep operation was executed. As a result, nonlinear aerodynamic characteristics with hysteresis of drag and lift forces in the yaw-sweep, were found in the case of the slanted base angle θ of 30 degrees. Two different flow patterns appearing at θ = 30 degree were revealed by using flow visualization and pressure measurement. These results show that the hysteresis phenomenon is due to the change of the flow structure : from the closed-type flow separation to the open-type flow separation.
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