Investigation of the electrostatic charge injection method at high hydrodynamic pressures

Ergene, E.L., Kourmatzis, A., Komperda, J., Schick, R.J., Shrimpton, J.S. and Mashayek, F. (2011) Investigation of the electrostatic charge injection method at high hydrodynamic pressures. 23rd Annual Conference on Liquid Atomization and Spray Systems - ILASS Americas, Ventura, United States. 15 - 18 May 2011. 8 pp .

Abstract

The electrostatic charge injection method is applied at high hydrodynamic pressures, up to 40 bar, to evaluate the electrical and atomization performance of a point-plane type charge injection atomizer using Diesel fuel. The main focus of this paper is to investigate the effect of electrostatic charging on higher pressure injection systems in order to form finer sprays. Laser Diffraction Spectrometry (LDS) measurements and imaging studies are performed to investigate the effect of the electrostatic charge injection technique on drop size distribution as a function of orifice size, applied electrode voltage, inter-electrode positioning, hydraulic pressure and corresponding axial tip velocity at high Reynolds numbers. It is observed that spray dispersion is enhanced and drop size is reduced with the increase in specific charge. The various stages experienced by the electrostatic spray as the electrode voltage is increased from zero are described in detail on the basis of an imaging study. LDS measurements are conducted to show how drop size profiles vary as a function of downstream position from the nozzle tip. These measurements are used to understand the aerodynamic effects of the surrounding air on the secondary break-up of the dense spray in virtue of more air entrainment to fuel spray. Finally, these findings are discussed and several advantages of the electrostatic charge injection method for modern diesel engines are outlined

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