抄録
One effective way to control separated-and-reattaching flows is a small control object placed near their the upstream. In the present study, the control object is a flat plate in the upstream, and the separated-and-reattaching flow is the flow past a semi-infinite plate. Special attention is paid for asymmetry of the control object, that is, inclination or attack angle of the control object. The authors conduct flow-velocity measurements using a hot-wire anemometer in a wind tunnel in order to get mean values, R.M.S. values and dominant frequencies of velocity fluctuations. As a result, we can classify the flow into three modes depending upon object scale, object position and object angle. Moreover, in order to clarify the modes qualitatively, the authors carry out flow visualisation with particle-image-velocimetry (PIV) analysis, and velocity-profile measurement by a hot-wire anemometer.
