壁面小孔アレーからの吹出し吸い込みによる乱流抵抗低減(S22-5 境界層,管内流の制御-1,S22 流れ制御の技術)
詳細
Measurements of total skin-friction drag by a fiber Bragg grating system (FBG), local velocity distributions by a particle image velocimeter (PIV) and local shear stress distributions by a shear stress sensor downstream of an actuator array using alterative suction and blowing jets was carried out to confirm the drag reducing effect. Ensemble averages of velocity distributions in the x-y plane using PIV were analyzed at various sensor positions in the spanwise direction for the fixed phase of the piston. Slight changes in the velocity profile in the vicinity of the wall, where skin-friction drag may be reduced, were found at several positions of measurement.
