The Impact Analysis Of Buildings On The Atmospheric Electric Field Distortion And Lightning Connection Process

Lightning protection of buildings has been one of the key problems of lightning physics research.Tall buildings Alone or among the buildings are easy to stimulate the up link pilot, so the lightning strike accident is more and often cause serious economic losses.The study of the building form affect atmospheric electric field distortion ,and the effects of Different building state do in the process of lightning is The current focus in the study of building lightning protection.This paper studies the different height, width structures and different distance of buildings affect the atmospheric electric field distortion,and the different influence of different building states do inthe lightning development process, established Lightning leads two-dimensional stochastic growth model, simulate the different building states and lightning rods by flash in the process different lightning development forms, through the statistical analysis of large amounts of data, puts forward the scheme of lightning protection of buildings.Specific research is as follows:Concluded that the potential distribution around the building by finite difference method to calculate two dimensional poisson equation. Studied the height,width of the building and the distance between buildings affect atmospheric electric field distortion and give the corresponding approximate fitting formula,the result shows, around the top of the distortion electric field intensity is proportional to the height of the building approximation,and reduce with the increase of width of the building;building group within the scope of a certain distance, high buildings will weaken low distortion electric field linear density of the lower buildings nearside,at the same time the high and low building height difference, the greater the distance protection,from a certain extent, explains the high buildings are more likely to be hit.Established Lightning leads two-dimensional random model based on the finite difference time domain method,,simulated the lightning development process,analysis the guide parameters such as length, join point position and stroke length in thunder clouds discharge process under different buildings and lightning rods.The simulation results show that,change the height of the buildings and the lightning rod will change the length of the downward leader and lead connection point position,building width and the location of lightning rod do not make any obvious effect; at the same time, the length of the stroke distance keep within a certain range does not have obvious change.Studied the process of lightning flash of lightning rod by the Lightning leads two-dimensional random model,analyzed the situation of lead the lightning flash of the single building on single and multiple root lightning rod and high and low buildings,the results show,the situation that answer the flash of lightning rod is related to the pilot development location of the horizontal distance and the location of lightning rod,and also the top of the tall building lightning protection for the space electric field distortion effect is the strongest.In this paper, by studying the different status of building and the lightning rod,and the effects on the development process of lightning, combined with lightning leader two-dimensional stochastic growth model,statistical and analyzed different situations of the lightning process, and it has some certain theoretical value and practical significance in the building lightning protection.