摘要
在小型开式冰风洞中对架空导线覆冰过程进行测试,风洞位于低温环境室中,在不同工况下,每隔1 h测量导线上的冰负荷和冰密度以及观察覆冰类型,覆冰测试时间为6 h,将实验结果与改进后基于热平衡的覆冰模型进行比较及误差分析。研究结果表明:当气流温度从-10℃逐渐升高到-2℃时,覆冰开始为干增长(雾凇),然后逐渐变为湿增长(雨凇),同时冰密度增加;风速增加会导致覆冰量增加,但如果气流中液态水含量比较高,即使是在较低的温度下,覆冰类型也为雨凇;改进的覆冰模型对导线冰负荷的预测与实验结果较吻合。
An experimental investigation of icing on overhead transmission lines was carried out in an open cycle icing wind tunnel located in a climatic chamber.Loads and density of ice were measured and ice type was observed every hour of 6 h duration of icing.Comparisons and error analysis were made between the experimental data and those predicted by improved heat balance model.The results show that as the air temperature gradually increases from ？10 ℃ to ？2 ℃,the icing process starts dry-growing（rime ice） and then changes into wet-growing（glaze ice）.With the increase of ice density,the increase of wind speed will result in the growth of the ice loads.But if the liquid water content is high,the icing process is wet-growing even at low temperature.Using the improved icing model,the prediction on the wire ice loads is comparatively consistent with the experimental results.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第9期2860-2864,共5页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(50976030)
关键词
架空导线
覆冰
干增长
湿增长
冰风洞
overhead transmission lines
icing
dry growth
wet growth
icing wind tunnel
