垭口型微地形输电线路区域风场仿真研究

Simulation of Wind Field in Erection Area of Yakou Micro-Relief Transmission Line

目前国内对垭口型微地形的研究大多只针对山体之上的风速变化,而对山体周围的风场特性却鲜有研究。建立不同地形参数的垭口型微地形的三维计算模型,并利用FLUENT有限元软件对其风场特性进行仿真研究,得到山体之上及山体之后的风场分布规律。结果表明,风速只在垭口型微地形部分区域内有明显变化,风吹过垭口型微地形后呈现反"弓"形效应,即山谷正后方风速较来流风速有明显增大,而山体正后方的风速较来流风速不增反减。最后通过拟合得到微地形风场内的不同位置风速修正系数的计算公式,为输电线路的铁塔设计及安全性评价提供了理论参考。

At present,most of the research on the Yakou type micro-relief in China is only directed to the change of wind speed above the mountain,and the characteristics of the wind field around the mountain are rarely studied.In this paper,the three-dimensional calculation model of the Yakou type micro-relief with different terrain parameters was established,and the wind field characteristics were simulated using FLUENT finite element software,and analyzed to obtain the wind field distribution law above and above the mountain.The results show that the Yakou type micro-relief has an influence on the wind speed distribution in the local range.The formula for calculating the wind speed correction coefficient in the micro-topography wind field was obtained by fitting,and the wind has a reversed"bow"shape effect after the Yakou type micro-relief,that is,the wind speed behind the valley is significantly higher than that of the incoming wind,and the wind speed behind the mountain is not increased or decreased compared with the incoming wind speed.The study provides a theoretical reference for the design and safety evaluation of transmission towers.