1999 年 19 巻 Supplement2 号 p. 135-136
A Variable Orifice Nozzle (VON) by changing a cross-sectional area of the nozzle injection hole, for improving a rate of injection and injection duration, has been developed to study its spray characteristics. Injection and spray pattern responded to the nozzle orifice cross-sectional area which is changing larger to smaller. Transient behavior of the sprays was recorded by two-frame CCD camera system which is based on a microscope with a long working distance. The analysis of the diesel spray velocity vectors were conducted using PIV analyzer with cross-correlation method. The system has been used with various techniques to provide a powerful tool for spray analysis.