A full hydrodynamic steady-state model of positive dc corona in coaxial cylindrical electrode

Abstract

The predictions of the steady-state distributions of the space charge and electric field in the coaxial cylindrical electrode are significant in many industrial applications. The positive dc corona in the coaxial cylindrical electrode is modeled by a full hydro-dynamic steady-state model and solved by the fourth-order Runge-Kutta method and the central finite difference approach. The new model predicts the distributions of the space charge and electric field in the whole electrode space. The effects of the electron diffusion, positive and negative charge recombination, and space photoionization are compared with the simplified model. The results present that the calculation accuracy of the new model is superior to that of the simplified model especially under large current. The simulation results also exhibit the influence of the corona current and conductor radius on the distribution of space charge and electric field and voltage-current characteristics.