Abstract
Flow separation is an undesirable phenomenon because it causes the large energy losses in a fluid machinery and stall on airfoils. The vortex generator jet (VGJs) method is an active control of flow separation and can achieve the adaptive control by properly adjusting the jet speed. Jets in a crossflow provide complex interacting flow that contains many vortices. It is important that the details of near fields of the jet are clarified for issuing the jet into a crossflow. For the VGJ method, the suppression effect on flow separation was 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 were described with the flow visualization technique. The formation and behavior of the vortices in the wake were affected by the jet orifice shape. For the T shaped jet orifice, there is a significant difference between the strengths of positive and negative vortices, and the wake vortices indicate the different structure in the spanwise direction.
