表面粗糙度对导线风荷载及涡激振动的影响

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (7) : 146-151.

论文

表面粗糙度对导线风荷载及涡激振动的影响

晏致涛1,2王灵芝2刘军2,游溢2,3，孙毅1

作者信息 +

Effects of surface roughness of conductors on their wind loads and vortex-induced vibration

YAN Zhi-tao1,2,WANG Ling-zhi2, LIU Jun2,YOU Yi2,3，SUN Yi1

Author information +

文章历史 +

摘要

输电导线的截面形状对导线的气动力特性有重要影响，其风压占整个输电线路风压的50%~70%。采用基于RANS的湍流模型，对真实粗糙截面和光滑截面导线的气动特性及横向涡激振动进行数值分析，并和试验进行了对比。利用ICEM对流体计算域进行结构化网格划分，采用动网格和滑移网格模型，将计算结构响应的Newmark-β通过UDF代码嵌入FLUENT软件，建立2D圆柱横流向涡激振动的计算模型。通过改变折减风速和雷诺数，研究均匀来流高雷诺数下输电导线的气动力和振动特性。结果表明，考虑导线表面粗糙度后，固定导线的气动力以及斯托劳哈尔数有所降低；导线涡激振动的“锁定”区的范围变广，振动幅值变大；当折减风速为5.766时，粗糙截面涡激振动的峰值振幅达到0.9D；导线的气动力以及涡脱模式也出现较大变化，即导线表面粗糙度对导线的气动特性影响较大。

Abstract

The effect of cross-section shape of conductors on their aerodynamic characteristics is significant. Their bearing wind pressure is almost 50 to 70 % of the whole wind pressure of a transmission line. Aerodynamic characteristics and vortex-induced vibration (VIV) of real conductors with rough cross-section and those of conductors with smooth cross-section were analyzed using the numerical simulation method and turbulence model based on RANS. The results were compared with those obtained with the test method. The fluid domain was meshed with ICEM. A 2-D circular cylinder in transverse flow direction’s VIV simulation model was established utilizing the dynamic mesh and sliding mesh model and embedding Newmark-β algorithm for structural response computation into the software FLUENT through the user define function (UDF) code. Aerodynamic and vibration characteristics of conductors under uniform flow and higher Reynolds number were studied with the variation of the reduced wind speed and Reynolds number. Simulation results showed that after considering conductors’ surface roughness, aerodynamic force and Strouhal number of fixed conductors drop; the range of conductors VIV’s "locked-in" region becomes wider and the vibration amplitude becomes larger; VIV amplitude of conductors with rough cross-section reaches 0.9D when the reduced wind speed is 5.766; aerodynamic force and vortex stripping mode of conductors with rough cross-section have larger changes, so the effects of surface roughness on aerodynamic characteristics of conductors are bigger.

导出引用

晏致涛1,2王灵芝2刘军2,游溢2,3，孙毅1. 表面粗糙度对导线风荷载及涡激振动的影响[J]. 振动与冲击, 2018, 37(7): 146-151

YAN Zhi-tao1,2,WANG Ling-zhi2, LIU Jun2,YOU Yi2,3，SUN Yi1. Effects of surface roughness of conductors on their wind loads and vortex-induced vibration[J]. Journal of Vibration and Shock, 2018, 37(7): 146-151

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