The Research On The Law Of The Air Containing Super Cooled Water Droplets Caught By The Icing Overhead Conductor

Atmospheric ice accretion on conductors is one of the major problems in planning and construcing power transmission lines and communications networks in regions where freezing temperatures occur frequently. China is one of the countries where ice accretion of conductors is very serious. With the development of the electrified rail network and the electrified railway, the impact of conductor icing will be more and more obviously.The research status of conductor icing is reviewed at the beginning, then some existing problems and the main content of this article are proposed.Secondly, not only the causes and conditions, various influencing factors, the prediction model of conductor icing but also the general principles and technical methods of anti-icing and de-icing are introduced; the key scientific issues were pointed out through analyzing, the main heat transfer process of conductor icing was analyzed.The definition of collection efficiency is explained, and the numerical model of the local collection efficiency of conductor icing is established; the local collection efficiencies at the same condition are numerical computed by using of Spalart-Allmaras, k ?εand k ?ωturbulent models. The simulated results show that the Spalart-Allmaras model is more convenient, more accurate and lower computing cost; some laws of conductor icing collection efficiency are obtained based on the simulation calculation of the local collection efficiencies at the different conditions with the turbulence model of Spalart-Allmaras.Then, on the basis of establishing the theoretical model, the laws of the conductor surface temperature at the different icing conditions are obtained by calculating, and they provide useful references to the experimental studies.Finally, through previous research and analysis, the conductor icing test is mainly designed with the accuracy verification test, the collection efficiency and the conductor surface heat transfer coefficient experimental scheme.The results of this study have great significance for understanding the mechanism of icing prevention on overhead conductor and this can also provide the theoretical basis and correlation data to experimental research of conductor icing.