渦発生ジェットによる後方ステップ流れの制御 : ジェット吹出しピッチおよび速度比の影響(流体工学, 流体機械)

抄録

The general goal of this study is to construct the closed loop control system of the reattachment process in a backward facing step flow by a row of the vortex generator jets. A row of injection holes which covers full span is located upstream of the step. Optimal conditions are studied experimentally by systematic variation of two parameters, injection hole pitch and jet velocity ratio. A micro wall flow sensor was used for measurement of forward flow fraction. It is found that the reattachment line is almost parallel to the spanwise direction in the range of the pitch of 10 d to 20 d, although the discrete disturbance by jet injection is provided at the step. The velocity ratio is one of the most effective manipulated variables in the control system of the reattachment process.