采用双向流固耦合数值方法对串列及并列布置的两个刚性连接三圆柱柱群结构涡激振动（VIV）响应特性及俘能性能展开研究。分析串列群间间距比Z=8、12和16和并列群间距比Zy=4、6、8,约化速度U*=2~13范围内,串列及并列布置中柱群结构的水动力干扰特性及俘能大小、俘能效率的变化规律。研究结果表明：相较于单组串列双柱群,串并列刚性连接的柱群表现出更为复杂的水动力特性和响应结果,在柱群间隙流与尾流的相互作用以及柱群的相互干扰作用下,两柱群结构的振幅响应出现了从涡激振动到驰振的过渡区。串列柱群后尾涡形式主要以2P、2S和2T形式脱落,个别约化速度下出现碎涡及带状涡。随着群间间距比的增加,柱群间相互干扰作用减弱。间距比对串列刚性连接柱群的俘能影响不明显,柱群的俘能值和能量密度随着U*的增加而增加,当初始分支转换到上端分支时,上下游柱群的能量获取优势发生了变化。并列柱群间干扰通过尾涡相互作用后实现,因此柱群间相互作用微弱,Zy=8时,其涡激振动响应与单柱群响应特性几乎一致。
Abstract
The vortex-induced vibration （VIV） response characteristics and energy capture performance of two rigidly coupled three-cylinder groups arranged in tandem and parallel are investigated using a two-way flow-solid interaction numerical method. The hydrodynamic interference characteristics of the column-group structures with tandem and parallel arrangements, as well as the variation laws of energy capture magnitude and energy capture efficiency are analyzed in the range of the tandem vibrator spacing ratios Z= 8, 12 and 16, parallel group spacing ratios Zy= 4, 6 and 8, and U*=2-13. The results show that the tandem and parallel rigidly connected column groups exhibit more complex hydrodynamic characteristics and response results than that of the single set of tandem double column group, and the amplitude response of the double column group structure shows a transition zone from vortex-induced vibration to cyclonic vibration under the interaction of the gap flow and wake flow of the column group, as well as the effect of the reciprocal perturbation of the travelling column group. The wake vortices formed after the tandem column clusters are mainly shed in the form of 2P, 2S, and 2T, and fracture vortices and band vortices appear when the individual velocities decrease. As the inter-oscillator spacing ratio increases, the effect of mutual interference between column clusters decreases. The effect of spacing ratio on the captured energy of the tandem rigidly connected column clusters is insignificant, and the captured energy value and energy density of the column clusters increase with the increase of U*, and the energy capture advantage of the upstream and downstream column clusters changes when the initial branch is converted to the upper end branch. The interference between parallel column clusters is realized after the tail-vortex interaction, so the interaction between the column clusters is weak, and the vortex-induced vibration response is almost the same as the single-column cluster response characteristics at Zy=8.
关键词
海洋能 /
俘能结构 /
涡激振动 /
流固耦合 /
俘能特性 /
刚性连接
Key words
ocean energy /
energy capture structure /
vortex-induced vibration /
fluid-structure interaction /
energy capture characteristics /
rigid connection
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基金
国家自然科学基金（52469017）; 云南省基础研究专项-重点项目（202401AS070058）
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