洗掘孔内の流れと円柱橋脚に働く流体力(流体工学,流体機械)

概要

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Local clear water scour around a cylindrical pier have been studied in a wind tunnel. Characteristics of fluid flow and fluid force acting on the pier standing in a scour were investigated with a pier and five different depth scours (scour depth/pier diameter=0, 0.5, 0.7,1.0 and 1.5). The diameter of the pier is 40 mm and free stream velocity is 16 m/s, so that the Reynolds number is 4.2×10^4. The flow visualization was carried out by the surface oil-flow pattern and smoke-wire methods. The surface pressure distributions on the pier and scour were measured and the drag coefficient of the pier was determined by integration of surface pressure distribution on the pier. Characteristics of the horseshoe vortex and drag acting on the pier in the scour are clarified. The results show that the two horseshoe vortices are observed in near the root the pier as the scour grows deeper and the stagnant area is formed in the bottom of the scour for the deepest depth.
一般社団法人日本機械学会の論文
2007-05-25