Abstract
In the second report, a new spray design method for smaller bore-size engine has been proposed to suppress soot emission. That theory can determine nozzle orifice size, number and injection pressure so that spray-characteristics such as specific air -entrainment and penetration are kept constant when bore size is changed. It has been confirmed experimentally that theoretical solutions based on ‘spray characteristics similarity’ can give almost constant soot emission even when bore size is reduced. It is expected that approach can reduce development process of various size diesel engine.
