Investigation on Effect of Offset Orifice Nozzle under Multi Pulse UltrahighPressure Injection and PPC Combustion Conditions

Abstract

The effect of nozzle orifice design on combustion characteristics under multi pulse ultra high pressure injection and PPC conditions. The objective of offset orifice nozzle is to shorten spray penetration and improve mixture formation in order to increase thermal efficiency. The offset orifice nozzle was designed by shift orifice aliment from into the sac center to edge of sac follow swirl direction. The experiments were carried out on a single cylinder engine at 0.55MPa gross IMEP at 1,750 RPM and 0.7MPa gross IMEP at 2,000 RPM. The injection pulses were 3 pulses equally mass under injection pressure up to 350MPa.