论文部分内容阅读
为研究脉动风场对覆冰导线动态气动力特性的影响,利用Fluent软件的用户自定义函数和动网格技术,计算了正弦风场下新月形覆冰导线在垂直振动与扭转振动耦合下的动态气动力系数,并与相同舞动条件下定常风场模拟结果进行比较;分析了来流速度脉动频率和幅值对气动力的影响.结果发现:覆冰导线在正弦风场作用下的动态气动力系数平均值略高于定常风场下动态气动力的数值;脉动风频率对阻力系数和升力系数的平均值影响较小;脉动风幅值增加会导致动态气动力系数的平均值增大.因此工程中进行输电线路防舞设计时,应考虑脉动风场幅值对气动力系数的影响.“,”In order to study the effect of unsteady wind on aerodynamic characteristics of iced conductor,using user-defined program function and dynamic mesh technology of software Fluent,the dynamic aerodynamic coefficients of crescent iced conductor during lateral and torsional vibration were calculated in sinusoidal wind field and compared with the results from simulation that conductor in steady wind field.The effects of frequency and amplitude in sine wind field on the aerodynamic forces are discussed.The results show that the dynamic aerodynamic coefficients are slightly higher than the steady wind ones.The effects of frequency in sine wind field on the mean value of drag and lift coefficients can be ignored.The mean values of dynamic aerodynamic increase with the increase of sine wind amplitude.So the effects of amplitude variety on aerodynamic characteristics should be taken into account for anti-galloping design of transmission lines in engineering.