Comparison of Dust Particle Dynamics Under Different Electrode Shapes at the Early Stage of Negative Corona Discharge

Electrode shape plays an important role in collecting efficiency of the arista electrode in electrostatic precipitation (ESP). Using hydrodynamic model coupled with Poisson's equation and applying finite element method, the characteristics of Trichel pulse under hyperboloid electrode and hemispherical electrode were compared. The numerical model is established in dry air at atmospheric pressure, using a traditional needleto-plane configuration, which is simplified from the model of arista electrode and a plate in ESP. Combined with the motion equation of dust particle, the motion characteristics of the dust particles at different positions in negative corona discharge with different electrode shapes are studied. Under the same average power, the anode of the hemispherical electrode collects more than twice as many dust particles as the hyperboloid electrode, and the number of dust particles attached to the cathode is a little less than that of the hyperboloid electrode, in the early stage of ESP.