中文摘要：

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。

英文摘要：

In the process of bundle conductor icing, downstream conductor is in the wake zone of upstream conductor and shadowing effect has an influence on air flow field and water droplet trajectories, so icing accretion characteristics are different between them. We adopted the Lagrange framework to calculate the water droplet trajectories and obtained the relations between collision coefficient and key factors. Results show that shadowing effect plays a major role in icing accretion characteristics. Collision coefficient （β） is increased with the increasing ofv or MVD. Within a certain diameter, D has a negative correlation with collision coefficient of bundled conductor （β）, that is,β is decreased with the increasing of D. ΔL has no influence on collision coefficient of upstream conductor while collision coefficient of downstream conductor is rising with the increasing of ΔL. The influence on ice shape on bundle conductor surface is analyzed in this paper based on control volume and thermodynamic equilibrium equations. In addition, icing tests on 2-bundled conductor were carried out in an artificial climate chamber, and the results verified the validity of the calculation method.