AM06-04-004 縦渦発生ジェット吹出し口形状が非定常渦構造に与える影響(流体一般(1),一般講演)

概要

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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 that 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 VGJs 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. Furthermore, the VGJs with T-shape orifices were practically applied to the flow separation control of a two-dimensional diffuser and the suppression effect for the T-shape orifice was compared to that for the circular orifice in the case of a large jet pitch angle (60deg). The VGJs with T -shape orifices make effective the separation control in contrast to the VGJs with circular orifices.
2006-09-05