摘要
排管敷设电缆群温度场是一个传导、对流和辐射3种传热方式的耦合过程,电缆群温度场和载流量计算必须考虑排管内部的空气自然对流和辐射传热。为此,基于传热学的基本原理,建立了10kV地下排管敷设电缆本体温度场域和电缆整体温度场域的有限元计算模型。采用有限元与流函数-涡量法相结合的方法,实现了传导、自然对流和辐射3种传热方式的流固耦合计算。借助于有限元分析软件ANSYS,得到含有内部空气对流和辐射的分散式排管敷设电缆群温度场分布。利用有限元和流函数-涡量法计算,克服了现有标准和文献中根据经验公式计算空气层热阻而引起的误差及不足,提高了计算精度。
The temperature field of pipe cables is a coupled conduction-convection-radiation field,convection and radiation of air in pipes should be calculated for the temperature field and ampacity of the pipe cables.FEM calculation of 10 kV cables in pipes was modeled by the basic principles of heat transfer.Based on conduction,natural convection and radiation heat transfer modes,fluid-solid coupling computation was implemented by vortices-stream function method and the finite element method.A kind of finite element analyzing software ＂ANSYS＂ was used to calculate temperature field distribution of cables in decentralized pipes that have cross-ventilation and radiation.The results show that the fluid-solid coupling computation has many merits compared with empirical formula adopted in existing standard and papers to calculate the thermal resistance of air,this method is of high accuracy.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第6期1566-1571,共6页
High Voltage Engineering
基金
河南省电力公司科技项目(2006第3批第8项)~~
关键词
有限元法
电力电缆
排管敷设
载流量
温度场
流固耦合计算
FEM
power cable
pipe laying
ampacity
temperature field
fluid-solid coupling computation
