ELECTRICAL-FIELD AND SPACE-CHARGE MODELING IN A VISCOUS-FLUID FLOW INA NOZZLE

In this paper the results of the modelling of viscous flow of a fuel o il in a spray nozzle with an applied electrical field are presented. T he most important effect is the emission of charges from the charge in jection electrode and their spatial distribution in the fluid. For the given geometry of the nozzle, fluid properties (density, viscosity, d ielectric permeability and so on), inflow rate and applied potentials at the electrodes, the numerical model gives the velocity, hydrodynami c pressure, electrical field, electrical potential and space charge de nsity distributions. The space charges are emitted from the nozzle's o utlet region forming a spray current and from the nozzle's walls (leak age current). On the basis of the calculated results, it is possible t o optimize the nozzle's geometry so that the leakage current to spray current ratio is minimal.