Large Vortex Formation-Mechanism behind Wedge under Several Separation Conditions
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概要
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This study investigated the mechanism of a large vortex formed behind a wedge under three angles of attack(α=0°, 22.5°and 45°)which have different separation conditions. Velocity field was visualized using LDV measurement and the FFT spectrum processing technique. It was found that the large vortex grows fully at the end of the vortex formation region defined by the authors. A flow saddle point corresponding to a stagnation point exists on the boundary of the region and almost coincides with the point where the large vortex is about to cut a separated shear layer. Especially in the case of α=22.5°, a separation bubble forms and stays on the upper surface of the wedge. Consequently, the mechanism of the vortex formation shows unique features, such as a flat and long vortex formation region, fluctuating velocities with high frequency over the separated shear layers near the separation points, and a large unibersal Strouhal number defined by Griffin.
- 一般社団法人日本機械学会の論文
- 1998-11-15
著者
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Matsudaira Yasuaki
Department Of Mechanical Systems Engineering Tokyo Metropolitan Institute Of Technology
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Obara Hiromichi
Department Of Mechanical Engineering Tokyo Metropolitan University
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Obara Hiromichi
Department Of Mechanical Systems Engineering Tokyo Metropolitan Institute Of Technology
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