串列联动双圆柱流致摆振试验研究

Test study on flow-induced rotation of tandem-linked double cylinder

提出了串列联动双圆柱流致摆振理念,构建了摆振运动方程,分析了受力与运动规律,建立了摆振试验装置,并基于室内试验探究了串列联动双圆柱流致摆振特性,研究旨在为流致振动发电设备设计提供参考。研究表明:串列联动双圆柱摆振响应表现为涡激振动规律;间距比对摆振振幅和锁定区间影响较大,当间距比为4时振幅最小且响应中出现“再增长区”,当间距比为6时振幅最大,当间距比为8时锁定区间最大;系统刚度对摆振响应趋势影响不大,但不同刚度下摆振达到的最大振幅差异明显,该试验最大弧长比A^(*)为0.98,出现在1 400 N/m刚度工况。

Here,the concept of tandem-linked double cylinder flow induced oscillation was proposed,the oscillation motion equation was established to analyze force and motion laws,the oscillation test device was built,and flow-induced rotation characteristics of tandem-linked double cylinder were explored based on indoor tests.The study could provide a reference for design of flow-induced vibration power generation equipment.It was concluded that tandem-linked double cylinder oscillation response exhibits a vortex-induced vibration pattern;the spacing ratio more largely affects oscillation amplitude and locking interval,when the spacing ratio is 4,the oscillation amplitude is the smallest and a“re-growth zone”appears in response,when the spacing ratio is 6,the amplitude is the largest,and when the spacing ratio is 8,the locking interval is the largest;system stiffness has a small impact on the trend of oscillation response,but differences among maximum amplitudes under different stiffness are obvious;the maximum arc length ratio A*in tests is 0.98,it occurs under the stiffness condition of 1400 N/m.