【作者】 刘鹏；

【导师】 李林；

【作者基本信息】 华北电力大学(北京) ， 机械工程， 2017， 硕士

【摘要】 风载荷作为造成电网输电线路舞动的主要外力,导线风阻系数决定着风载荷大小,开发和研究低风阻导线对对降低线路造价、提高输电线路承载能力和安全运行具有重要意义,是近年来国内外电网建设和输电导线研制的关键技术之一。本文根据工程实际需要开展了输电线路低风阻导线的结构设计与研究,具有重要的学术意义。本文以工程上应用最为广泛的JL/G1A-630/45-45/7钢芯铝绞线为基础对象,研究制定导线截面改造方案和主要的结构参数,根据计算流体动力学(CFD)基础理论和分析方法,应用FLUENT软件开展建模和不同截面的设计方案,设计参数的导线风阻系数计算,分析不同结构和设计参数风阻系数的变化规律,为低风阻导线的开发和研制提供了技术依据。文中通过对比验证源于实际工程实验数据,计算数据和试验结果的可靠性。论文主要工作和取得的成果如下:1、建立了开展导线气动力特性分析的计算流体力学模型,通过在FLUENT软件环境下大量仿真计算和分析,研究了导线建模中边界层添加,外部网格划分和运算模型选择等问题;2、研究了低风阻导线的设计方法,通过改变传统导线设计了V型沟槽和凹槽两种导线外层结构方案,通过改变设计参数完成了98中导线的风阻系数仿真计算和气动力分析,研究了低风阻导线结构和设计参数对导线风阻系数的影响规律;3、根据低风阻导线对风阻系数的影响规律,研究了本文设计的两种低风阻导线在不同工况下的气动力学特性和使用条件,给出了低风阻导线参数设计的不同方案。更多还原

【Abstract】 The wind load is the main external force of the transmission line of the grid,and the wind resistance coefficient determines the wind load.The development and research of the low wind resistance wire are of great significance to reduce the cost of the line and improve the carrying capacity and safe operation of the transmission line.In recent years,Power grid construction and transmission line development of one of the key technologies.In this paper,according to the actual needs of the project to carry out the transmission line lowresistance wire structure design and research,has important academic significance.In this paper,the most widely used JL / G1A-630 / 45-45 / 7 steel core aluminum wire is used as the base object,and the transformation scheme and main structural parameters of the wire section are studied.According to the basic theory of computational fluid dynamics(CFD)And the analysis method,the design of FLUENT software and the design scheme of different cross sections are used to calculate the drag coefficient of the parameters.The variation law of the drag coefficient of different structures and design parameters is analyzed,which provides the technical basis for the development and development of low resistance wire.In this paper,the reliability of the data and experimental results is calculated by comparing the actual engineering experiment data.The main work of the paper and the results are as follows:1.The computational fluid dynamics model of the aerodynamic characteristics of the conductor is established.Through the simulation and analysis of the FLUENT software environment,the problems such as the addition of boundary layer,the selection of external meshing and the choice of operation model in the wire modeling are studied.2.The design method of low-resistance wire is studied,and the outer structure scheme of V-shaped groove and groove is designed by changing the traditional conductor.By changing the design parameters,the wind resistance coefficient simulation and aerodynamic analysis of the conductor in 98 are completed.The influence of the structure and design parameters of the low-resistance wire on the drag coefficient of the wire is studied.3.According to the influence of low drag resistance on the drag coefficient,the aerodynamic characteristics and operating conditions of the two low-resistance wires under different working conditions are studied,and the different schemes of low-resistance conductor parameters are given.更多还原