The Research Of Transmission Lines Ice Growth Fluid-mechanics Model

In recent years, to implement the strategic goals of “large-scale development in west” and “West Power to East, North Power to South”, and promote the construction of EHV and UHV transmission engineering, some EHV/UHV transmission lines have been built in the regions that cause transmission line icing easily. So to carry out the related basic research, to build the useful, precise transmission lines icing growth predictive models, are the protection of the transmission lines from the harsh environment.the process of formation of icing is complicated, it includes the fluid mechanical process that droplets hit to the lines, and the thermodynamics processes that droplets freeze on the lines. So such a phenomenon can been broken down into three steps:the collision, the capture and the freeze.This paper carried out the emulation and simulation of the outflow of the lines, and got its distribution, which include the distribution of velocity, the distribution of temperature and the distribution of pressure, then the correlative factors were analyzed.The distribution of velocity can help analyse of the force and the trajectory of the droplets,after this, the local collision rate and its influence factors were analyzed.On the basis of the simulation of the outflow and the local collision rate of the droplets, this paper continued the analysis of the thermal balance processes, and the heat balance equations were built. Then the paper analysed the influence of the heat convection,numerical simulated the Nusselt number, improved the formula of the Nusselt number,finally built the Ice Growth Fluid-Mechanics Model, which makes the quality calculations of the ice more practical, and makes the model more effective, precise than the traditional calculation formula.