Effects of Inlet Edge Roundness on Cavitation in Injector Nozzles and Liquid Jet

Abstract

Innovation of fuel injection technology are necessary for lower emission and higher thermal efficiency of diesel engines. The effects of the geometry of injector nozzles on cavitation flows in the nozzles and discharged liquid jets have to be understood well, since the liquid jet and spray characteristics affect diesel combustion largely. In this study the effects of the inlet edge radius of injector nozzles on cavitation and liquid jet are quantitatively investigated by the visualization of two-dimensional nozzles with various inlet radii. As a result, we found that round inlet edge nozzles results in a thin cavitations,small cavitation clouds shed with a high frequency,and small liquid jet angle