Influence Of Dust Particle Behavior On Parameters Of DC Corona Discharge Plasmas

During the operation of electrical equipments,dust particles often attach to or move along the shell and surface that are exposed to the outside air.When the concentration of dust particles reaches a certain amount,it will distort the electric field intensity distribution of electrical equipment,resulting in abnormal operation of the equipment.When there is turbulence in the air flow on the surface of the equipment,or there is a large amount of droplets in the air,the dust particles will have a series of aggregation phenomena due to the effect of force,resulting in changes in the average particle size and distribution of the particles,which directly aggravates the degree of electric field distortion on the surface of the electrical equipment,and even generates a slight discharge at this location.These coalescence phenomena of dust particles will also change the discharge electron density and ion density distribution of the discharge plasma,the change of electric field and ionization rate,and the propagation path of the plasma in the air,making it more difficult to explore the parameters in the inherently complex plasma.The study of this complex physical process will help to understand the influence of dust particles on plasma parameters in the discharge plasma,and provide beneficial reference for the protection of electrical equipment.In this paper,the wet aggregated model of dust particles due to the liquid bridge force in the air droplet is introduced into the discharge process,and the pin-plate corona discharge model is used to qualitatively analyze and study the influence of the wet condensation process of dust particles on the distribution of electrons,heavy matter ions,electric field,ionization rate,etc.in the discharge process.The main work is as follows:(1)Considering the aggregation process and characteristics of dust particles in high humidity environment,according to the wet aggregation kernel function of dust particles,the average particle size change process of dust particles in high humidity environment is given by using the integral quadrature method of moment(QMOM),which provides a research basis for the subsequent study of the influence of wet particle aggregation on DC corona discharge plasma parameters.(2)By studying the relationship between the DC corona discharge plasma parameters and the wet coalescence of dust particles in the presence of dust particles,the laws of the electric field intensity,ionization rate,electron density and the distribution of heavy species before and after the coalescence of particles are analyzed.(3)The DC corona discharge model,of which time scale determined by the plasma is established.The wet aggregation model of high concentration dust particles is introduced to analyze the influence of wet aggregation of dust particles on the chemical reaction process,as well as the change of wet condensation of dust particles on the dynamic chemical reaction process of plasma is studied,with some heavy species particles as the object.