脉动风场覆冰导线动态气动力特性研究

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摘要导线在覆冰后成为非圆截面，周围压力与流速分布复杂化，采用准静态假设分析动态的覆冰导线舞动理论公式的传统方法局限性较强。充分考虑风场的动态变化，基于弱耦合方法，利用Fluent进行二次开发，编程控制导线舞动轨迹、攻角和风速变化进行编程控制，并结合重叠网格技术实现覆冰导线静态与动态气动力模拟，分析气动力系数特性及规律。仿真结果表明：当平均风速相同时，湍流度为8%的脉动风工况下的气动力系数与定常风场气动力系数变化趋势相同，但在风攻角15°附近时发生突变；导线横向舞动时的动态气动力系数明显大于静态值，以风攻角45°为分析对象，导线扭转振动导致气动力系数和频率降低。覆冰导线舞动时动态气动力系数变化复杂，工程中采用静态气动力系数预测舞动幅值及张力有所误差。

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	韦远武1
	虢韬1
	张鹏程2
	杨刘贵1
	严尔梅1
	徐梁刚1
	王璐2
	祝贺2

关键词 ：脉动风场, 动态气动力系数, 二次开发, 重叠网格, 横扭耦合

Abstract：The conductor becomes a non-circular section after icing, and the distribution of pressure and velocity around it is complicated.The traditional method of using quasi-static hypothesis to analyze dynamic galloping theoretical formula of icing conductors has strong limitations.Considering the dynamic changes of wind field, based on the weak coupling method, the secondary development was carried out by using Fluent.The galloping trajectory, angle of attack and wind speed of a conductor were programmed and controlled.The static and dynamic aerodynamic simulation of the iced conductor was realized by using overlapping grid technology, and the aerodynamic coefficients were analyzed.The simulation results show that when the average wind speed is the same, the aerodynamic coefficients of 8% turbulence fluctuating wind have the same trend as the aerodynamic coefficients of steady wind field, but mutation occurs near the wind attack angle of 15 degrees; the dynamic aerodynamic coefficients of conductors in lateral galloping are obviously larger than the static values.Taking the wind attack angle of 45 degrees as the object of analysis, the torsional vibration of conductors leads to the decrease of aerodynamic coefficients and frequencies.The dynamic aerodynamic coefficients of ice-covered conductors vary very complex when they gallop, so the prediction of galloping amplitude and tension by static aerodynamic coefficients in engineering is erroneous.

Key words： fluctuating wind field dynamic aerodynamic coefficient secondary development overset grid transverse torsion coupling

收稿日期: 2019-06-06 出版日期: 2020-12-15

引用本文:

韦远武1，虢韬1，张鹏程2，杨刘贵1，严尔梅1，徐梁刚1，王璐2，祝贺2. 脉动风场覆冰导线动态气动力特性研究[J]. 振动与冲击, 2020, 39(24): 150-155.
WEI Yuanwu1,GUO Tao1,ZHANG Pengcheng2,YANG Liugui1,YAN Ermei1,XU Lianggang1,WANG Lu2,ZHU He2. A study on dynamic aerodynamic characteristics of an iced conductor in pulsating wind field. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(24): 150-155.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I24/150

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