Modeling of DC corona discharge along an electrically conductive flat plate with gas flow

The development of a corona discharge was evaluated numerically over a region of a semi-infinite flat plate having small (Ohmic) surface conductivity with a flowing gas. The model simulates a positive corona discharge (ionic wind) generated by two parallel wires mounted flush with the surface of the plate and directed with the free-stream gas flow. The deposition and removal of ions at the surface are permitted. Five coupled partial differential equations govern the gas phase model together with empirical equations for electrical discharge (/spl Phi/-I characteristics). Two voltage bias case studies were considered: first, the two electrodes have the same potential but are of opposite sign, and second, the positive electrode carries the full potential with the remaining electrode grounded. Several interesting effects relating to the voltage and current distributions, surface potential, and free-stream velocity are observed. Boundary layer development and surface shear are also discussed.