Flow Past a Square Prism with Cut-Corners (Effect of the Angle of Attack)

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This study aims to investigate drag reduction of a square prism with cut-corners for nonzero values of the angle of attack α. Selected cutout dimensions are mainly (i) c1/a = c2/a = 0.00, (ii) c1/a = 0.15 and c2/a = 0.05 and (iii) c1/a = 0.15 and c2/a = 0.25. The flow patterns are visualized by using a vortex particle method for Re = 200, and experimentally a hydrogen-bubble (for Re = 4000) and an oil-flow (for Re = 10000) techniques. In addition, the hydrodynamic force on the prism is experimentally measured with either a digital manometer (for pressure coefficient Cp) or a force transducer (for drag and lift coefficients CD and CL).Results for some kinds of flow patterns and the measured hydrodynamic coefficients were given with respect to the angle of attack α. Within the present conditions, the cutout dimension of (iii) c1/a = 0.15 and c2/a = 0.25 achieves the effective drag reduction in the range 0°<img src="/jstage/pub/jjsem/images/abstractGraphics/12_s23_2.jpg"/> α <img src="/jstage/pub/jjsem/images/abstractGraphics/12_s23_1.jpg"/>14° although this dimension unfortunately causes the oscillation of the gallop at about α = 10°.

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  • 実験力学

    実験力学 12 (Special_Issue), s23-s28, 2012

    日本実験力学会

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