G0500-3-6 円柱の表面構造変化による抗力低減([G0500-3]流体工学部門一般講演(3))

概要

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It is known that occurs at a lower Reynolds number in the case where there exist grooves or roughness on the circular cylinder surface. In this paper, in order to make clear the flow characteristics around a cylinder with 17 and 32 triangular grooves at intervals of 11.25° along the cylinder with a centrally-located stagnation point, the drag coefficient, velocity distribution and turbulence intensity distribution were measured. Moreover, the flow around the cylinder was analyzed by applying the RNG k-ε turbulent model, and surface flow pattern was investigated using the oil-film technique. From these results, a sudden decrease in the mean drag coefficient of a cylinder with 17 and 32 triangular grooves occurs at a lower Reynolds number. For a wide range of 17 grooves compared with 32 triangular grooves. Moreover, the results of the numerical analysis tend to agree well with the experimental values.
一般社団法人日本機械学会の論文
2010-09-04