Effects of Downstream Cylinder by Changing Upstream Object's Diameter

被引：0
|
作者：
Kim, Sang Il [1 ]
机构：
[1] Kangwon Natl Univ, Dept Mech Engn, Chunchon, South Korea
来源：
TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS B | 2014年 / 38卷 / 10期
关键词：
Lock-in; Vortex; Fluctuating Velocity; Fluctuating Lift Forces;
D O I：
10.3795/KSME-B.2014.38.10.859
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
This experimental study investigates the effects of a downstream cylinder in the wake change on upstream object's diameter. A V-shaped object is placed in the upstream of the test section and a circular cylinder containing a load-cell is placed in the downstream. The velocity distribution of the wake generated from the upstream object with a change in its diameter is investigated. Further, the fluctuation in the lift coefficient and Karman-vortex emission frequency with a change in the position of the downstream cylinder is examined. The study results reveal the following. i) The flow velocity in the wake is smaller than that in the main stream. ii) The lock-in phenomenon occurs when the diameter of the upstream object is larger than that of the downstream cylinder. iii) To generate maximum fluctuating lift force of the downstream cylinder in the wake, the position of the downstream cylinder must be moved with changing diameter of the upstream object together.
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页码：859 / 864
页数：6
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