Abstract
Effects of nozzle hole shape on a spray behavior of diesel fuel were investigated experimentally. Characteristics of sprays injected from triangle hole and square hole were compared with those of spray injected from conventional circular hole. The areas of triangle hole and square hole were almost same as that of circular hole. The spray behavior was observed using a high-speed digital video camera. As the results, a free spray behavior of diesel fuel was strongly influenced by the nozzle hole shape. Further, sprays injected from triangle hole and circular hole were impinged on a wall and behavior of the sprays were investigated. Spray width and spray thickness were measured from photographs, and spray volume was estimated. In the case of triangle hole, the spray grew up asymmetrically after wall impingement. The spray volume was influenced by the nozzle hole shape and distance between nozzle tip and a wall.
