D形およびI形断面柱の抗力軽減 : 第1報,圧力分布の測定と流れの可視化(流体工学, 流体機械)

概要

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Flow characteristics around the D-shape cylinders which cut out the front face of a circular cylinder and the I-shape one which cut off the front face and rear faces were investigated in the range Re=(1.38〜8.0) × 10^4. The following conclusions were obtained. For the D-shape cylinder with the cutting angle of 53 deg at Re ≧ 2.3 × 10^4, the shear layer separated from the front edges reattaches on the circular arc of the cylinder, and the transition in the boundary layer and the turbulent separation occur. As the results, the wake width decreases and the vortex formation region goes downstream. The Strouhal number increases beyond 0.28 and the base pressure coefficient has a maximum of -0.70. The drag coefficient of the D-shape cylinder decreases to 0.7. The same phenomenon occurs for the I-shape cylinder with the front cutting angle of 53 deg and the rear cutting angle of 115 to 127 deg at Re ≧ 2.3 × 10^4.
社団法人日本機械学会の論文
2002-09-25