摘要
为研究覆冰导线在微风下的振动特性,对新月形覆冰导线在不同雷诺数下的绕流问题进行仿真,计算得到的阻力系数与已有实验结果一致.分析了雷诺数对绕流参数的影响,得到了各参数的变化规律.结果表明:与导线未覆冰时相比,覆冰导线出现卡门涡的雷诺数要滞后,卡门涡对应的雷诺数范围明显缩小,斯特劳哈尔数和阻力系数均减小;卡门涡振动的频率降低,但振幅增高.研究结果可以为输电线振动的防治提供理论参考和实验指导,同时将可视化的仿真结果应用到理论教学中,可以弥补实验条件不足及真实实验难以实施的困难,节省教学资源,加强教学与工程应用之间的有机结合.
In order to study the characteristics of aeolian vibration of iced conductor,the flow around iced conductor with crescent section was simulated under different Reynolds number using computer fluid dynamics software.The drag coefficients acquired from numerical simulation and experiment are quite identical.The effect of Reynolds on flow parameters was analyzed and the laws of the parameters were obtained.The results show that in comparison with un-iced conductor,Reynolds number that appears Karman＇s vortex of iced conductor is lagged,the Reynolds number range of Karman＇s vortex obviously reduces,the Strouhal number and drag coefficient lessen,the frequencies of Karman＇s vortex vibration are lower,and vibration magnitude is higher.These provide theoretic reference and experiment instruction for prevention and cure of transmission lines vibration.The viewable simulation results were applied to theoretic teaching,which can supply the lack of experiment conditions and implement difficulty,save the teaching equipment,strengthen the combination between teaching and engineering application.
出处
《天津理工大学学报》
2014年第1期56-59,共4页
Journal of Tianjin University of Technology
基金
天津市自然科学基金(11JCYBJC05800)
天津理工大学教学改革项目(YB11-31
YB11-30)
关键词
覆冰导线
绕流
气动力
仿真
教学
iced conductor
flow around conductor
aerodynamic characteristics
simulation
teaching
