Abstract
The authors have improved the combustion of DI diesel engine, using high pressure injection equipments which can produce over 150MPa injection pressure, and still been studying the simultaneous reduction of NOx and particulate emissions. In those researches, shock wave was observed around the diesel spray which was injected into a high pressure vessel, at high injection pressure. In this paper, the shock wave was visualized on the schlieren photographs taken by a still camera and an image-converter camera, using rubby or argon laser as a light source.
