Abstract
A synthetic jet device is a tool for generating a jet, and a synthetic jet actuator is a useful tool for active flow control. The synthetic jet actuators are low operating power, zero-net-mass-flux and very compact devices which have demonstrated their capability in modifying the subsonic flow characteristics for boundary layer flow control. In the present study, the effect of the strength of the synthetic jet on the three-dimensional behavior into a crossflow was investigated. In this experiment, two case of jet-to-crossflow velocity ratio VR were used. The deformation of the vortex ring produced by the synthetic jet into the crossflow is affected by the VR. For VR=0.1, the vortex ring exists at the outer edge of the boundary layer and connected to the wall via a pair of counter-rotating legs (trailing legs). It was confirmed that the boundary layer mixing was promoted for VR=0.1 in contrast to the case of VR=1.0.
