摘要
各工程领域中的细长柱体结构常因旋涡脱落导致结构振荡(或振动)甚至疲劳破坏,为了减弱或抑制涡激振荡(或振动),有必要针对有效的旋涡脱落抑制方法展开研究。本文采用首部射流方法设计了一套流动控制装置来抑制模型的涡激振荡。通过拖曳水池中开展的实验,利用Qualisys光学运动捕捉系统,针对3种开孔布置方案和多组射流流量进行测试,研究了雷诺数在2.4×10^4时定常首部射流(q/Q=0~0.0312)对单自由度模型涡激振荡的影响。实验结果表明:首部射流在不同程度上能有效地减小非定常涡放升力所引起的圆柱的横向位移。实验中还发现涡流脱落对横向位移的减少程度表现为2种不同的模式,即横向位移突然、明显的降低和随后一种处于饱和状态的位移状态。
Vortex shedding often causes oscillation(or vibration),even fatigue damage of slender cylindrical structures in many engineering fields,so it is necessary to study effective means for vortex shedding control,so as to reduce or suppress vortex-induced oscillation(or vibration).A flow control device is designed based on the forward jet method for suppressing the vortex-induced oscillation of cylinders.Aiming at three types of hole arrangement and several groups of jet flow rates,an experimental test was performed in a towing tank,using the optical motion capture system(Qualisys).The effect of steady forward jets on the single degree of freedom vortex-induced oscillation of a cylinder is studied at with a Reynolds number of 2.4×10^4.The range of the dimensionless jet flow rate(q/Q)is from 0 to 0.0312.Experimental results show that the forward jets can effectively reduce the lateral displacement of the cylinder to a different degree,which is induced by the unsteady vortex shedding lift.In addition,there are two distinct modes to reduce the displacement caused by vortex shedding:a sudden and very pronounced decrease of lateral displacement at a critical value of flow variables and a saturation mode where no further displacement decrease is observed.
作者
付国强
戴绍仕
孙丽萍
Younis Bassam A.
FU Guoqiang;DAI Shaoshi;SUN Liping;YOUNIS Bassam A.(College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,China;Department of Civil&Environmental Engineering,Davis 95616 USA)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2021年第1期27-33,共7页
Journal of Harbin Engineering University
基金
黑龙江省自然科学基金项目(LH2019E026)
国家重大项目省级资助项目(GJ2019GJ0036).
关键词
圆柱
涡激振荡
单自由度
抑制
首部射流
流动控制
实验测试
circular cylinder
vortex induced oscillation
single freedom
suppression
forward jets
flow control
experimental test
