Circulation characteristics of horseshoe vortex in scour region around circular piers

查看全文 作　　者：Subhasish [1]DAS;Rajib [1]DAS;Asis [1]MAZUMDAR

机构地区：[1]School of Water Resources Engineering,Jadavpur University

出　　处：《Water Science and Engineering》索引2013年第6卷第1期,共19页

摘　　要：This paper presents an experimental investigation of the circulation of the horseshoe vortex system within the equilibrium scour hole at a circular pier, with the data measured by an acoustic Doppler velocimeter (ADV). Velocity vector plots and vorticity contours of the flow field on the upstream plane of symmetry (y = 0 cm) and on the planes ±3 cm away from the plane of symmetry (y = ±3 cm) are presented. The vorticity and circulation of the horseshoe vortices were determined using the forward difference technique and Stokes theorem, respectively. The results show that the magnitudes of circulations are similar on the planes y = 3 cm and y = -3 cm, which are less than those on the plane y = 0 cm. The circulation decreases with the increase of flow shallowness, and increases with the densimetric Froude number. It also increases with the pier Reynolds number at a constant densimetric Froude number, or at a constant flow shallowness. The relative vortex strength (dimensionless circulation) decreases with the increase of the pier Reynolds number. Some empirical equations are proposed based on the results. The predicted circulation values with these equations match the measured data, which indicates that these equations can be used to estimate the circulation in future studies. 关键词：环流特征马蹄涡周围地区码头冲刷声学多普勒流速仪 Stokes定理圆形

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Circulation characteristics of horseshoe vortex in scour region around circular piers

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