Finite Element Analysis Of Electromagnetic Field In Argon Discharge

In recent years,gas discharge has shown outstanding performance and potential in cutting-edge scientific fields such as materials,environment,thermonuclear fusion and plasma,etc.Its main research is on the movement law and application of charged particles in electric field,so it has been widely concerned by scholars.However,gas discharge involves a variety of disciplines and the physical process is very complex,which makes it difficult to conduct direct theoretical research.Meanwhile,the high experimental cost and harsh experimental conditions also make it difficult to conduct gas discharge experiments.These factors lead to the lack of comprehensive understanding of the physical mechanism of many key physical phenomena in gas discharge,which limits the development of related fields to a large extent.In recent years,the rapid development of computer simulation technology provides a new way to solve the problems related to gas discharge.Gas discharge under atmospheric pressure,prone to filamentous discharge in many fields requires us to produce stable and uniform plasma,existing conditions in the laboratory,this paper mainly through to the atmospheric pressure under argon discharge electromagnetic field finite element analysis,find the argon discharge from townsend discharge regularity related to lingers discharge,through the control of the related parameters,to avoid the argon discharge lingers discharge development,makes the argon gas steady uniform discharge under certain condition.The related theory of gas discharge,introduces the finite element analysis method,finite element analysis for argon discharge pretreatment in the first place,the mathematical model of the argon discharge will be argon discharge of geometry,boundary conditions and so on into mathematical equations,including continuity equation,ion continuity equation and transmission equation,poisson equation,the electric field on the basis of mathematical model,continue to define the geometric area,geometric properties,determine the solution domain,set up the relevant parameters,argon discharge one dimensional simulation model is set up,complete the pretreatment part of finite element analysis,by solving differential equations of the finite element method under the condition of dc,Implements the simulation of argon discharge behavior,obtain electron density in the process of discharge,the ion density,electric field,such as spatial data,analyze the related properties of argon discharge plasma,discharge of argon was analyzed by the initial electron avalanche from cathode to anode,plus the impact of cathode emission secondary electron and discharge development process of negative lingers,and townsend discharge theory and lingers.The transformation of argon discharge is analyzed respectively under the following three conditions :(1)apply dc voltage;(2)Apply DC voltage and add medium layer;(3)Apply ac voltage and add medium layer.By analyzing the characteristics of argon discharge plasma in the above three cases,the relation curve between voltage and time during the transformation of argon discharge form is obtained,and this curve is regarded as the critical condition curve for the transformation of argon discharge form from Townsend form to stream form.Argon discharge experiment simulation analysis results,the experimental results compared with the results of simulation analysis,proves that the simulation model is correct,so the results of simulation validity is verified,Furthermore,in the simulation verified by experiments,according to the output response of the discharge system under different voltages,the control model of the discharge system is obtained.Through the weight coefficient method,the discharge system model under any step is obtained.The proportional differential link is used to control the system,so as to increase the damping,reduce the overshoot and improve the dynamic performance of the discharge system.