THE EFFECT OF BOUNDARY-CONDITIONS ON THE DOWNSTREAM PENETRATION OF PULSED SPRAYS AFTER IMPACTION ON A FLAT SURFACE

An experimental study has been conducted of the wall sprays produced a fter impaction on a flat surface by the pulsed spray from a single hol e nozzle. The experiments are of relevance to direct injection diesel engines and they extend the range of boundary conditions covered in pr evious work, with variation of gas density, spray wall angle, gas cros s-flow velocity and cross-flow turbulence level. The initial and bound ary conditions are documented to provide a database which is suitable for computational fluid dynamics (CFD) model validation of an importan t aspect of diesel engine in-chamber flow. Previous work in the area i s described and published empirical correlations are reviewed. The mea surements of wall spray penetration as a function of time are presente d and described and a correlation equation is proposed which fits the data with good accuracy.