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
1. School of Architecture Engineering, Chongqing Institute of Science & Technology, Chongqing 401331, China;
2. School of Civil Engineering, Chongqing University, Chongqing 400045, China;
3. Electric Power Research Institute, State Grid Xinjiang Electric Power Company, Urumqi 830011, China
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.
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. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(7): 146-151.
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