Experimental study on flow past a circular cylinder with rough surface
Experimental study on flow past a circular cylinder with rough surface
复制标题
DOI：
10.1016/j.oceaneng.2015.08.062
复制
发表时间：
2015-11-15
影响因子：
5
通讯作者：
Tan, Soon Keat
中科院分区：
文献类型：
--
作者：
Zhou, Bo;Wang, Xikun;Tan, Soon Keat
研究了在明渠和拖带槽中流过具有光滑、沟槽和凹痕表面的圆柱体（粗糙度系数k/D=0.05，其中k为沟槽/凹痕深度，D为圆柱体外径）的流动。在本研究中考虑了两种不同尺寸的圆柱体（D=40和100 mm）。基于圆柱体直径的雷诺数范围从7.4 × 10(3)到8 × 10(4)。在某些情况下，使用压电式测压元件直接测量了气缸上的流体动力（阻力和升力），并使用数字粒子图像测速仪（PIV）测量了尾流流型。结果表明，槽形和凹形圆柱比光滑圆柱产生更小的平均阻力。由于沟槽或凹痕表面的影响，柱面顶点脱落的强度变得较弱，这表明尾迹比光滑柱面的尾迹更小更窄。(C) 2015 Elsevier Ltd.版权所有。
Flow past a circular cylinder with smooth, grooved and dimpled surface (roughness coefficient k/D=0.05, where k is the depth of the grooves/dimples and D is the outer diameter of the cylinder) was investigated in an open channel and a towing tank. Two different sizes of cylinder (D=40 and 100 mm) were considered in the present study. The Reynolds numbers based on the cylinder diameter ranged from 7.4 x 10(3) to 8 x 10(4). The fluid dynamic forces (drag and lift) on the cylinder were directly measured using a peizoelectric load cell, in conjunction with measurements of the wake flow pattern using digital Particle Image Velocimetry (PIV) for some cases. The results reveal that the grooved and dimpled cylinders produce a lower mean drag than that of a smooth cylinder. The strength of vertex shedding from the cylinder becomes weaker due to the effect of grooved or dimpled surfaces, as indicated by a smaller and narrower wake than that of the smooth cylinder. (C) 2015 Elsevier Ltd. All rights reserved.