20308 はく離制御効果に与える縦渦発生ジェット吹出し口形状の影響(流れの計測と制御(2),OS6 流れの計測と制御)

概要

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The vortex generator jet (VGJs) method is utilized to prevent flow separation. Longitudinal vortices are generated by the interaction between the freestream and the jet flow. The fluid particles which have large freestream energy are supplied to decelerated fluid particles in the boundary layer by the secondary flow of longitudinal vortices. In this study, the suppression effect on flow separation was investigated for two types of jet exit conditions (nozzle and orifice). For the orifice type jets, the circular and the rectangular orifice shapes were installed. The longitudinal vortices generated by the nozzle type jets are stronger than those for the orifice type jets. The strong secondary flow of longitudinal vortices was observed in the region close to the lower wall for the nozzle type jets in contrast to that for the orifice type jets. The VGJs with the nozzle type jets are useful to effective control of flow separation. However, the orifice type jets with rectangular shape can be improved the suppression effect in the orifice type jets with circular shape.
2006-03-09