分裂导线覆冰增长模拟计算及试验验证

发布时间：2018-04-18 23:21

本文选题：分裂导线 + 遮蔽效应　；参考：《高电压技术》2017年03期

【摘要】：在分裂导线覆冰过程中,由于下风侧子导线处于上风侧子导线的尾流区,空气流场及水滴运动的轨迹受到上风侧子导线遮蔽效应的影响,两者覆冰特性之间存在差异。为此采用多相流场计算的拉格朗日法,通过跟踪水滴的运动轨迹,得到分裂子导线的碰撞系数β与气流速度v、水滴中值直径(MVD)、导线直径D和子导线间距ΔL的关系。结果表明:分裂子导线流场的耦合影响可归结为水平布置的上风侧子导线对下风侧子导线的遮蔽效应;v或MVD越大,上、下风侧子导线的β越大。且上风侧子导线的β值较大,但两者的差异随v或MVD的增大而逐渐减小。在一定直径范围内,D与上、下风侧子导线的β呈负相关,即β随D的增大而减小。ΔL不影响上风侧子导线的β,而下风侧子导线的β随ΔL的增大而增大。基于控制体思想,结合热力学平衡方程,分析了v和MVD对导线表面覆冰形状的影响。并在人工气候室进行二分裂导线的覆冰试验,验证了计算方法的有效性。
[Abstract]:In the ice process of split conductors, the air flow field and the track of water droplet motion are affected by the shielding effect of the upper side sub-conductors because the downwind side sub-conductors are in the wake region of the upper side sub-conductors, and there is a difference between them.In this paper, the Lagrangian method is used to calculate the multiphase flow field. By tracking the track of the water droplet, the relation between the collision coefficient 尾 and the velocity of the airflow, the median diameter of the water droplet, the diameter of the traverse D and the distance between the sub-conductors 螖 L are obtained.The results show that the coupling effect of the flow field of the split conductor can be attributed to the shielding effect of the horizontal arrangement of the upper side conductors to the downwind side conductors (v or MVD), and the greater the 尾 of the downwind side conductors.The 尾 value of the upper side sub-conductor is larger, but the difference between the two decreases with the increase of v or MVD.In a certain range of diameters, there is a negative correlation between the 尾 of the downwind side and the upper, that is, 尾 decreases with the increase of D, 螖 L does not affect the 尾 of the upper side of the conductors, but the 尾 of the lower wind side increases with the increase of 螖 L.Based on the idea of control volume and thermodynamic equilibrium equation, the influence of v and MVD on the ice-coated shape of conductor surface is analyzed.The ice coating test of two-split conductors was carried out in the artificial climate chamber, and the validity of the calculation method was verified.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;国网重庆市电力公司经济技术研究院;国网重庆市电力公司检修分公司;
【基金】：国家重点基础研究发展计划(973计划)(2014CB260401) 国家自然科学基金(51377180)~~
【分类号】：TM752

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