10310 Flow Visualization of Vortical Structure in the Near Field of Vortex Generator Jets with Non-Circular Orifices

The vortex generator jet method is an active control of flow separation and can achieve the adaptive control by properly adjusting the jet speed. It is important to control flow separation effectively that the details of near fields of the jet are clarified for issuing the jet into a crossflow. For the vortex generator jets, the suppression of flow separation is affected by the jet orifice shape. In this study, structural features resulting from the interaction of a non-circular jet issuing transversely into a crossflow are described with the help of flow visualization technique and hot-wire anemometry. The formation and behavior of the vortices in the wake were affected by the jet orifice shape. The velocity measurements were carried out in the wake during one cycle of the wake vortex passing through the measurement position. The increment of the vertical velocity was observed in the wake and the weak momentum near the lower wall was transported to the main flow by the wake vortex.