采用SUPG有限元法对隧道内电缆进行热分析

Yongchun Liang
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引用次数: 1

摘要

本文对敷设在隧道内的地下电力电缆进行了热分析和电容量评价。针对地下输电系统中电缆与挡土洞之间区域的空气调节公式,提出了一种流线迎风/Petrov-Galerkin (SUPG)稳定有限元法。在热分析中,提出了地下电缆的非线性耦合电磁-热模型,以及电缆外表面与隧道内表面之间的辐射热交换。分析表明,电缆外表面与隧道内表面之间的空气对流诱导换热比传导诱导换热强得多。最后,采用牛顿-拉赫普森迭代法计算了电缆的容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal analysis of cables in tunnel using SUPG finite element method
In this paper thermal analysis and ampacity evaluation of underground power cables that are placed in Tunnel are presented. A Streamline-upwind/Petrov-Galerkin (SUPG) stabilized finite element method is proposed to solve the air governing formulations in the region between the cables and the retaining tunnel in the underground power transmission system. In thermal analysis, a nonlinear-coupled electromagnetic-thermal model of underground cables and the radiation heat exchanges between external cables surface and internal tunnel surface is proposed. The analysis reveals that the convection induced heat exchange is much stronger than the conduction induced heat exchange in the air between external cables surface and internal tunnel surface. At last, Newton-Rahpson iteration method is used to evaluate the cable ampacity.
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