Illustration of the dependence of the electrohydrodynamic force on the electrode configuration in a positive corona discharge

In the present work, the spatial distribution of the electric field, the space charge density and the electrohydrodynamic force (EHD) of a stationary DC positive corona discharge in air are evaluated with the aim of characterizing their effects on the electric wind generated by the electrical discharge. Two electrode configurations have been considered: (a) wire-to-plane, and (b) two wires-to-plane, with three different values of the distance between the wires (0.2 cm, 1 cm, and 2 cm). Each wire is subjected to a high positive voltage and the plane is grounded. The electric field and the space charge density have been obtained by solving numerically the continuity equation for the charged particles coupled to Poisson equation. These two physical quantities allow to calculate the EHD force and to illustrate the effect of the interaction between the two wires on the EHD force distribution.