三角形排列波浪锥柱涡激振动响应特性研究

Research on the response characteristics of vortex induced vibration of triangular arranged wave cone columns

摘要

采用重叠网格和UDF技术对亚临界雷诺数Re=3 900下三角形排列波浪锥柱涡激振动特性进行了数值模拟，分析不同横流向间距比L/D_m=2～5、顺流向间距比T/D_m=2～6、折合速度U_r=4～15时下游波浪锥柱单自由度涡激振动振幅、频率、升阻力系数随折合速度的变化规律。研究表明:下游波浪锥柱在上游双波浪锥柱复杂尾流作用下，其振动激励模式由上游剪切层重附着转变为尾流融合下的交替泄涡激励模式，脉动升力系数显著提升，有效拓展了锁频区间，在适当工况下较之单波浪锥柱振幅提升可高达23.2%，且在锁定区间内升力系数出现多频现象，随着折合速度增大，多频现象逐渐减弱。为无叶片风力机群的布局方式提供了理论支持。

Abstract

The vortex-induced vibration of triangular arranged wavy conical columns at subcritical Reynolds number Re=3 900 is numerically simulated by using overlapping grid and UDF technique. The amplitude，frequency and drag coefficient of vortex induced vibration of the downstream wavy conical column with reduced velocity were analyzed for different transverse flow direction spacing ratio L/D_m=2-5，forward flow direction spacing ratio T/D_m=2-6 and reduced velocity U_r=4-15. The research shows that the vibration excitation mode of the downstream wave cone column under the complex wake of the upstream double wave cone column changes from the upstream shear layer reattachment to the alternating vortex excitation mode under the wake fusion，and the pulsation lift coefficient is significantly increased，effectively extending the frequency locking interval. The amplitude increase can be as high as 23.2% compared with that of the single wave cone column under appropriate working conditions，and the lift coefficient appears multi-frequency phenomenon within the locking interval. With the increase of the reduced velocity，the multi-frequency phenomenon gradually weakens. The study provides theoretical support for the layout of bladeless wind turbines.

关键词

波浪锥柱 / 三角形排列 / 尾流作用 / 涡激振动 / 数值模拟

Key words

wavy conical cylinder / triangular arrangement / wake effect / vortex-induced vibration / numerical simulation

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基金资助

国家自然科学基金资助项目(12372232)