1323 D 形および I 形断面柱まわりの流れ特性 : 第 1 報ストローハル数と背圧係数

概要

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Flow characteristics of the D-shape or I-shape cylinder cut the front face or the front and rear faces from a circular cylinder 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, the transition in the boundary layer occurs and the turbulent separation occurs. As the results, the wake width decreases and the vortex formation region goes downstream, then the Strouhal number increases beyond 0.28,the base pressure coefficient has a maximum of -0.70. The drag coefficient of the D-shape cylinder decreases to 0.7. The same phenomena 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
2002-09-20