Abstract
Recent lightning simulation experiments have not simulated the influence of blade rotation in the long term after corona inception. This study uses a finite element method and considers the adhesion and collision processes of positive ions, aerosol ions, and neutral particles to establish a two-dimensional positive corona discharge model based on a multicomponent diffusion transport equation. The microscopic distribution of these three types of particles and the influence mechanism of charged particles’ migration under electric fields and wind were studied. The results show that ion migration is affected by both electric field and wind speed. The higher the wind speed, the larger is the deviation amplitude of charged particles along the direction of wind. With an increase in wind speed, the corona current on the receptor surface gradually increases. When the wind speed is 30 m/s, the corona current peak value increases by almost six times when compared with that when no wind is present. From this, it can be inferred that blade rotation reduces the concentration of positive ion in the receptor area, thereby facilitating electron avalanche and streamer-leader conversion.
Highlights
With the rapid increase in the number of wind power installations in China, the capacity of wind power units has been gradually increasing
The left and right boundaries were set to zero charge, and the receptor and lower boundary of positive ion n+ was set on the receptor surface to ensure that the generated positive boundary were set to ground
/m3 [12].under ofand positive particles, aerosol particles, andset neutral i different wind speeds were simulated according to the 2D corona simulation model of the receptor
Summary
With the rapid increase in the number of wind power installations in China, the capacity of wind power units has been gradually increasing. The rotation of the wind turbine will change the space charge distribution, which will facilitate the initiation of an upward leader [4], so the breakdown voltage will decrease with the increase of blade speed It presently cannot be explained why the effect of rotation speed on the breakdown voltage under different gap conditions is opposite. As lightning rods were being investigated, these studies only considered the thundercloud electric field’s influence on migration features Their results did not consider the influence of wind, and they cannot be compared with the corona of the rotary blade receptor under the background of an actual thundercloud. The simulation results can be compared with the influence of actual blade rotation on the ion distribution and corona current in the blade tip region under negative thunderclouds, and they can provide a basis for discussing the lightning strike development process under blade rotation
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