1308 長手方向にV型溝を有する円柱の流体抵抗に及ぼす溝の粗さの影響(GS-5 数値流体力学と乱流(2))

概要

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The profile drag of cucular cylinders with v-type grooves in the longitudinal direction was measured in the range of Reynolds number Re=1×10^4 to 8×10^4 in a uniform flow. An Eiffel type low speed wind tunnel in an experimental apparatus produces a muximum velocity of 21 m/s at the blow down section of width 300mm and height 400mm. The effect of the groove roughness on the drag coefficient were examined experimentally. The measurement of profile drag were carried out a direct method using the strain gauge load cells. The roughness of the cylinder surface was shown by the ratio h/d of v-type groove depth h and the diameter d of test cylinder. V-type grooves in the longitudinal direction have a great effect on the profile drag of circular cylinders. As h/d increases, the drag coefficient for the circular cylinders decreases abruptly at lower Re. The drag coefficient for the circular cylinders with v-type grooves in the longitudinal direction begins to decrease abruptly, when roughness Reynolds number is approximately 300.
一般社団法人日本機械学会の論文
2001-03-16