Flow control behind a circular cylinder by control rods in uniform stream

被引：17

作者：

Gim, Ok-Sok

Kim, Sang-Hyun ^{[1
]}

Lee, Gyoung-Woo ^{[2
]}

机构：

[1] Inha Univ, Sch Mech Engn, Dept Naval Architecture & Ocean Engn, Inchon 402751, South Korea

[2] Mokpo Natl Maritime Univ, Dept Naval Architecture & Ocean Engn, Mokpo 534729, South Korea

来源：

OCEAN ENGINEERING | 2011年 / 38卷 / 17-18期

基金：

新加坡国家研究基金会;

关键词：

Circular cylinder; Flow control; Ocean buoy; Particle Image Velocimetiy (PIV); Control rod; Velocity field; Turbulence intensity; FLUCTUATING LIFT; DRAG;

D O I：

10.1016/j.oceaneng.2011.09.030

中图分类号：

U6 [水路运输]; P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

Flow control by rods of various sizes attached to the rearward stagnation point of a circular cylinder is investigated in a circulating water channel using a 2-frame gray level cross-correlation Particle Image Velocimetry (PIV) technique. Experiments are performed at Reynolds numbers between Re=5000 and Re=20,000, based on free stream velocity and the main circular cylinder diameter (D=50 mm). Time-mean velocity fields, turbulence intensity, and Reynolds shear stress are measured with four control rods and four step Reynolds numbers. The wake formation behind a cylinder was influenced by the interaction between the upper and lower sides of the wake, due to the effect of the control rods. Each control rod had distinctive characteristics. However, there was no one optimum control rod for all Reynolds numbers. The control rod d/D=0.3 had an outstanding effect on reducing the turbulence intensity, with vortex formation strongly suppressed by the control rod in its near wake. Strong turbulence intensity appeared within X/D=2.5 for all cases. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：2171 / 2184

页数：14

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