摘要
针对串列双Π型断面涡激振动气动干扰效应,对不同间距比、不同阻尼比条件下,上下游Π型断面在均匀流场中涡激振动气动干扰效应进行风洞试验研究,并将上下游Π型断面涡激振动锁定区间、涡激振动振幅分别与单幅Π型断面进行了对比。结果显示：上下游Π型断面涡激振动锁定区间基本不随间距比、阻尼比变化而变化,上下游Π型断面的涡激振动振幅则随间距比和阻尼的变化而变化。上游断面涡激振动气动干扰效应主要受间距比D/B的影响,当间距比D/B=0.5~1.0时,对上游断面涡激振动干扰效应最为明显;下游断面涡激振动气动干扰效应主要受上游断面涡激振动振幅影响;随着双幅断面间距比增加,这种干扰效应逐渐减弱。
The aerodynamic interference effects on vortex-induced vibration（VIV） of two Π-shaped cylinders in tandem in smooth flow were investigated in the present paper.The section models of the two Π-shaped cylinders in tandem with various separation ratios D/B（D is the net distance between the two Π-shaped cylinders in tandem,B is the width of the single Π-shaped cylinder.） and damping ratios were tested in smooth flow in a wind tunnel.The vortex lock-in intervals and the amplitudes of the windward and the leeward Π-shaped cylinders were compared with those of a single Π-shaped cylinder.The results show that the lock-in intervals of VIV of the windward and the leeward Π-shaped cylinder cylinders are not affected by the factors such as the separation ratio D/B and the damping ratio.However,the amplitudes of VIV of the windward and the leeward Π-shaped cylinders are affected by above factors.The aerodynamic interference effects on VIV of the windward Π-shaped cylinder are mainly affected by the separation ratio D/B,and these effects are the maximum when D/B is 0.5-1.0.The aerodynamic interference effects on VIV of the leeward Π-shaped cylinder are mainly affected by the VIV amplitudes of the windward Π-shaped cylinder.These effects decrease with the increasing of the separation ratio.
出处
《工程力学》
EI
CSCD
北大核心
2011年第12期199-205,共7页
Engineering Mechanics
基金
国家自然科学基金项目(50608030
50738002)
关键词
串列双幅Π型断面
涡激振动
气动干扰效应
风洞试验
均匀流场
two Π-shaped cylinders in tandem
VIV
aerodynamic interference effects
wind tunnel tests
smooth flow
