Control of turbulent longitudinal vortices by suction and blowing through wall hole array

摘要

In order to control the longitudinal vortices in turbulent flow, a suction-blowing actuator array which can produce artificial horseshoe-like vortices by water jets was tested in closed loop water channel. By using a fiber Bragg grating (FBG) system, total skin frictional coefficient of flat plate was also measured to evaluate the effect of the suction-blowing control and detected some drag reduction. The local shear stress measured using a hot-film probe indicated the cyclic stress change that had the same phase relation as the piston-blowing.