基于水滴碰冻效率的扩径导线防冰特性分析

doi:10.19595/j.cnki.1000-6753.tces.220350

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摘要

输电线路导线覆冰危害电力输送安全,导线防冰/除冰方法一直是国内学者关注的焦点,近年来,利用扩径导线进行防冰的方法被一些学者提出。该文针对扩径导线防冰特性问题,对不同直径导线表面的水滴碰撞和冻结过程进行分析,研究了导线直径对水滴碰撞系数和覆冰速率的影响,提出扩径导线临界防冰直径Dp 的计算方法,并对不同风速、水滴中值体积直径和不同温度条件下的Dp 值进行了仿真计算。此外,通过不同直径铝管的自然覆冰试验对扩径导线的防冰性能进行了验证。研究结果表明：扩径导线表面的最大水滴碰撞系数随着直径的增大而减小,但水滴碰撞范围会扩大;由于导线表面的水滴捕获率和覆冰速率均随着直径的增大先增加后减小,利用扩径导线进行防冰需使其直径大于临界防冰直径Dp,风速、水滴中值体积直径越大,环境温度越高,Dp 值越大。

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关键词 ：扩径导线, 覆冰, 水滴碰撞系数, 防冰

Abstract：

Conductor icing endangers the safety of power grid. Conductor anti-icing and de-icing methods have always been the focus of domestic scholars. In recent years, the method of using expanded conductor for antiicing has been put forward by some scholars.
In order to understand the anti-icing characteristics of expanded conductor, firstly, the water droplet collision and freezing process on the conductor with different diameter are analyzed. Based on the boundary element method, considering the drag effect of airflow on water droplets, a computational model of airflow field on conductors is established, and the overall collision efficiency of water droplets on conductors is obtained by tracking the trajectory of water droplets, which represents the droplet capture ability of conductors with different diameters.
Secondly, the influence of conductor diameter on water droplet collision efficiency and icing rate is studied. The simulation results show that the airflow drag force on the water droplets increases due to the increase of the conductor diameter, which reduces the ratio of the water droplet collided with the conductor due to the inertial effect. And the overall droplet collision efficiencyon conductor surface gradually decreases with the increase of the conductor diameter. However, as the maximum local droplet collision efficiency is at the stagnation point on the windward side, with the increase of conductor diameter, the maximum local droplet collision efficiency at the stagnation point gradually decreases.And the collision range is expanding, resulting in the amount of captured water droplets stopping decreasing with the increase of conductor diameter. Therefore, it is necessary to calculate the overall water droplets capturedby the conductor per unit time dM/dt (kg/(s·m)) to determine the droplets capturing capacity ofconductorswithdifferentdiameters.
Thirdly,the definition of the critical anti-icing diameter of the expanded conductor is proposed as follows: under the same environmental conditions, when the diameter of the expanded conductor is greater than DP, the icing rate of the conductor continues to decrease,DP is the critical diameter of anti-icing of the expanded conductor under this environmental condition.The simulation results show that the larger the wind velocity is, the larger the critical diameter DP. With the increase of MVD, the larger water droplets are more likely to collide with the conductor under the inertial action, and the corresponding DPunder the condition of large MVD is also greater.
The anti-icing performance of the expanded conductor is verified by the natural icing test of aluminum tubes with different diameters. The results show that the maximum droplet collision efficiency decreases with the increase of conductor diameter, but the droplets collision range will expand; As the water droplet capture rate and icing rate first increase and then decrease with the increase of conductor diameter, the diameter of expanded conductor for anti-icing needs to be greater than DP. The larger the wind velocity and median volume diameter of water droplets, the higher the ambient temperature, and the greater the value of DP.

Key words： Expanded conductor icing water droplets collision efficiency anti-icing

收稿日期: 2022-03-10

PACS:

TM85

通讯作者: 韩兴波男,1992年生,博士研究生,研究方向为复杂大气环境下输电线路外绝缘及防护。E-mail：hanxingbocqu@163.com

作者简介: 吴海涛男,1991 年生,硕士研究生,研究方向为复杂大气环境下输电线路外绝缘及防护。E-mail：2269838881@qq.com

引用本文:

吴海涛, 韩兴波, 蒋兴良, 郭思华. 基于水滴碰冻效率的扩径导线防冰特性分析[J]. 电工技术学报, 0, (): 155-155. Wu Haitao, Han Xingbo, Jiang Xingliang, Guo Sihua. Analysis of Anti-icing Characteristics of Expanded Diameter Conductor Based on Water Droplet Collision and Freezing Efficiency. Transactions of China Electrotechnical Society, 0, (): 155-155.

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