위상 도플러 법을 이용한 직분식 가솔린엔진용 와류형 고압 인젝터의 분무 특성에 관한 연구

Gasoline direct injection engines have been studied to improve engine efficiency and to reduce emission. Spray characteristics of an injector have an important effect on engine efficiency and emission. Thus the purpose of this study is to provide the fundamental data for injector design which is investigated on the spray characteristics of high pressure swirl injector for GDI engine. In this paper, PDA was utilized for the measurement of mean velocity of droplets. Measurement field was from 10mm below nozzle tip to 100mm in axial direction and 20mm in radial direction. The results are presented by the vector to illustrate the magnitude and direction of velocity at each position. The spray images were also utilized to make the measurement position