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염정국(Jeongkuk Yeom),박종상(Jongsang Park),김시범(Sipom Kim),정성식(Sungsik Chung),하종률(Jongyul Ha) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.7
The characteristics of combustion process in an internal combustion engine are affected by the mixing process between injected fuel and ambient gas. Therefore, it is necessary to understand the mixture formation process of diesel spray. In this study, the spray structure was visualized by the exciplex fluorescence method, which can provide the simultaneous 2-D images of vapor and liquid phase in inner spray. For accurate investigation, the liquid-phase images were recorded with a 35mm still camera and CCD camera. Consequentially, it could be confirmed that the high-concentration vapor phase is formed in the region of spray tip and the edge of the liquid phase where droplets exist in the evaporating diesel spray, and the formed vapor is spread by diffusion. Also, the distribution of vapor is determined by the motion of droplets that exist in the edge of the liquid phase and the spray-tip region.
설계변수에 따른 디젤 인젝터 캐비테이팅 유동에 관한 연구
염정국(Jeongkuk Yeom),정우성(Woosung Jeong),이무연(Mooyeon Lee),김시범(Sipom Kim),정성식(Sungsik Chung),하형수(Hyeongsoo Ha) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.4
In this study, the CFD simulation analysis(ANSYS 13.0 CFX) about inner flow of the multi-hole injector was conducted directly. Based on these processes, DOE was applied to obtain the effect of injector nozzle design parameters on cavitation. The design parameters that is judged affecting cavitating flow are defined to nozzle hole diameter, nozzle hole length, nozzle hole angle and K-factor of the nozzle hole for design sensitivity and S/N ratio analysis. Also the 16 experimental points were used to analyze the effect of each parameter. In order to reveal inner flow of nozzle, the numerical analysis program and analysis of S/N ratio are applied in this paper. Consequently, it was founded that effect of K-factor is larger than any other parameters (hole diameter and hole angle) on generating cavitation.