2015 十字型断面を有する柱状構造物周りの流れと流体力特性

概要

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Flow visualization around a cylinder with cruciform cross-section and measurements of fluid forces acting on it were conducted in a water tunnel to investigate their characteristics. The visualized results indicate that flow around a cylinder with cruciform cross-section is classified into two patterns. One is perfectly separated flow, and the other is reattached flow. Perfectly separated flow is observed on the condition of small angle of incidence, and reattached flow is observed on the condition of large angle of incidence. The critical angle of incidence for the flow pattern transition is about 7.5∿15 degree. The steady lift coefficient is negative in any angle of incidence for the flow pattern transition is about 7.5∿15 degree. The steady lift coefficient is negative in any angle of incidence. At the critical angle of incidence, the steady drag coefficient has its minimum value while the Strouhal number and the absolute value of the steady lift coefficient attain to their maximum. The characteristic of flow around a cruciform cylinder and its fluid forces is similar to those of square prism.
社団法人日本機械学会の論文
2002-09-20