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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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

Received: 10 March 2022

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TM85

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	Wu Haitao
	Han Xingbo
	Jiang Xingliang
	Guo Sihua

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Wu Haitao,Han Xingbo,Jiang Xingliang等. Analysis of Anti-icing Characteristics of Expanded Diameter Conductor Based on Water Droplet Collision and Freezing Efficiency[J]. Transactions of China Electrotechnical Society, 0, (): 155-155.

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