摘要
绝缘子覆冰是一种复杂的自然现象,涉及流体力学、热力学、气象学等多方面的问题。为了实现绝缘子湿增长覆冰的数值计算和模拟,该文采用软件仿真、理论分析和试验研究相结合的方法分析了不同环境条件下的绝缘子表面水滴碰撞捕获、水膜的流动和冻结等物理过程。综合考虑冰棱长度对绝缘子外部流场及水滴运动轨迹的影响及冰棱壁面水膜＂断流＂对冰棱生长的影响,基于质量守恒定律和能量守恒定律,建立了绝缘子表面覆冰厚度和冰棱增长的计算模型。在重庆大学人工气候室内通过控制环境参数,对FXBW-110/100绝缘子进行湿增长覆冰试验,记录不同环境温度、不同风速下复合绝缘子伞裙表面覆冰厚度、冰棱长度随着时间的变化规律。将试验值和模型计算值进行对比,得到绝缘子表面覆冰厚度平均误差〈15%,冰棱长度平均误差〈10%,验证了模型的有效性。
The icing of insulator is a complicated process including hydromechanics, thermodynamics and meteorology. In order to realize the numerical calculation of wet-growth icing on insulator, according to the perspective of climate conditions, this paper analyzed the collision process of water droplets, the flowing and frozen of water film on insulator surface during wet-growth icing process. Based on heat balance and mass balance, a complete wet-growth icing model including the calculation of ice thickness on insulator surface and the growth of icicles was established. The model took the changing of flow field because of icicle effects into consideration, and calculated the growth rate of icicles by following the flowing loss of water film on insulator surface. Meanwhile, the model corrected the equations of icicle length calculation according to investigation of water film cutting off on icicle wall. A series of wet-growth tests on FXBW-110/100 under different environmental temperatures and different wind speeds were conducted in artificial chamber in Chongqing University. The test results including the icing thickness on insulator surface and the icicle length are compared with what obtained by model calculation, which indicates that the icing thickness is within 15% of average error while icicle length is within 10% of average error.
作者
蒋兴良
韩兴波
胡玉耀
杨忠毅
JIANG Xingliang;HAN Xingbo;HU Yuyao;YANG Zhongyi(State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology （Chongqing University）, Shapingba District, Chongqing 400044, Chin)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第8期2496-2503,共8页
Proceedings of the CSEE
基金
国家自然科学基金重点项目(51637002)
国家创新研究群体基金(51321063)~~
关键词
绝缘子覆冰
湿增长
冰棱长度
覆冰厚度
水膜
ice-covered insulator
wet-growth icing
icicle length
icing thickness
water film
