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LPG 액상 분사 시스탬의 인젝터 노즐 내부 유동 측정과 LPG 분무 모델의 개발
권혁선(Hyuksun Kwon),최회명(Hoimyung Choi),김만식(Manshik Kim),민경덕(Kyounhdoug Min) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
LPG has been well known as a clean alternative fuel for vehicles. Recently, the new Liquid Phase LPG Injection(LPLI) system extends the limits of primitive LPG engine's power and improves load control property.<br/> In this study, internal flow of LPG fuel in visualization nozzles was investigated using back-light method and different flow patterns in each nozzles were examined. A nozzle model was developed assuming that the processes in the nozzle are isentropic and utilized to calculate initial conditions of spray model. Three-dimensional spray simulation was performed using Lagrangian method and the simulation results were compared with the expeimental results. As proportion of butane within the fuel and injection pressure was increased, more LPG fuel was observed in liquid phase. Comparing the results of nozzle model calculation with the images from visualization experiments, developed nozzle model was proved to be fairly<br/> reasonable and useful. Also, three-dimensional simulation results were agreed well wit<br/> experimental results in spray penetration length and velocity.