输电线路覆冰导线对流换热的数值模拟  

Numerical Simulation of Surface Heat Convection for Iced Conductor

作　　者：朱永灿[1] 黄新波[2] 贾建援[1] 程丹[2] 林淑凡[2] 张烨[2] 

机构地区：[1]西安电子科技大学机电工程学院,西安710071 [2]西安工程大学电子信息学院,西安710048

出　　处：《高电压技术》2015年第10期3441-3446,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724507-3);国家自然科学基金(51177115);教育部"新世纪优秀人才支持计划"(NCET-11-1043)~~

摘　　要：现有架空线覆冰、融冰模型忽略研究对象的温度场分布,难以进行局部热平衡分析。针对该问题,通过对比确定对流换热是覆冰、融冰过程中重要的热量损失原因,并建立了裸导线及覆冰导线的对流换热有限元模型,获取不同Reynolds数下覆冰对象的Nusselt数分布曲线。结果表明：覆冰对象表面对流换热差异明显,当Reynolds数为10 000时,裸导线及圆形覆冰导线迎风区域-45°~45°范围内的局部Nusselt数平均值分别为总平均值的1.45倍和1.48倍;随着Reynolds数增加,上述倍数值略有降低。最后拟合出了局部平均Nusselt数计算公式,该公式有利于提高对流换热数值计算精度,可用于改进覆冰、融冰模型。It is difficult to analyze local thermal equilibrium since the existing icing and melting-ice models generally neglect temperature field distribution. Consequently, we comparatively analyzed the thermal equilibrium and found that convection heat transfer is the main factor of heat loss during icing and ice-melting processes. We also established finite element models of bare conductors and iced conductors and obtained Nusselt number distribution curves of the objects under different Reynolds numbers. The simulation shows that there is a significant difference in convective heat transfer on iced conductor surface： the local average Nusselt number of-45°-45° around upwind area on a circular iced conductor is as 1.48 times much as general average Nusselt number when Reynolds number is 10 000, and for a bare conductor, the ratio is 1.45. Besides, the above-mentioned ratios slightly decreased with the increase of Reynolds number. Finally, the local average Nusselt number formula is obtained by fitting these numerical simulation data which can improve the accu- racy of calculating convection heat transfer, showing that the research is of significance for improving icing and ice-melting models.

关 键 词：输电线路 覆冰 融冰 对流换热 NUSSELT数 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TM752[动力工程及工程热物理—热能工程]