Effect of swirl Injector Characteristics on the Performance and Emission in a Direct-Injection Gasoline Engine

Abstract

This paper presents a study on the effect of injection rate on the performance and emissions in a direct-injection gasoline engine. Five kinds of swirl injectors were utilized with the static injection rate of 600,700,800,900 and 1000cc/min at an injection pressure of 7MPa. The BSFC is shown to have its optimum at aninjection rate. The BSFC variation is attributable to the combustion efficiency variation due to the behavior of droplet concentration of the fuel spray. The effect of the static injection rates was not recognized in both mechanical efficiency, and cycle efficiency.