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[디젤엔진부문] 투명 아크릴 모델을 이용한 디젤 인젝터 노즐에서의 캐비테이션 유동에 관한 연구
장용석(Yongsuk Jang),김만식(Manshik Kim),민경덕(Kyoungdoung Min) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
Experiment was conducted in transparent acrylic nozzle model which was scaled up by 10 times in order to study the behavior of cavitation flow inside the nozzle holes. High speed CCD camera was used to visualize the flow inside sac chamber and holes. Refractive index matching technique was also used to prevent distortion of images. Reynolds number and Cavitation number was simultaneously matched in the same range of the real injector by means of controlling the flow rates and pressures.<br/> The experimental results shows that the difference between cavitation layer and liquid layer causes very turbulent flow inside the nozzle hole and the effect of needle lift is the dominant factor that determines the behavior of the cavitation flow pattern.<br/> In the low lift case. due to the transient nature of turbulent flow within the sac volume. string cavitation from one hole to another hole occurred in intermittent way<br/>