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냉각수순환시스템 흡입구 주변의 보텍스 생성에 관한 연구
표영석(Youngseok Pyo),박영규(Youngkyu Park),이연원(Yeonwon Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
There have been many studies on sump models but existing studies of pump sump models mainly validate fluid flow and vortex around a pump intake using a single-phase method. In this study, multi-phase method is used for observation of free surface vortex and cavitations occurring by air inhalation and water pressure drop. The purpose of this study is to compare the multi- phase model and the single-phase model to evaluate the difference of the multi-phase and the single-phase model. Also steady and unsteady simulations are conducted to verification the difference of results according to the analysis conditions. A pump sump of test model is calculated using CFD and the following points are analyzed. 1)The location and the behavior of the free-surface vortex and submerged vortex 2)The Velocity distribution at the pump intake, 3)The free-surface vortex in the multi- phase and single-phase method.
피스톤 냉각용 엔진 오일제트 노즐 유동특성에 관한 연구
리리(Li Li),권지혁(JiHyuk Kwon),이종훈(JongHoon Lee),최윤환(YoonHwan Choi),이연원(YeonWon Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently Automobiles are becoming more important in our life, the study on piston of engine is needed because, cooling and lubrication of piston have an effect on the life and efficiency of engine directly. This study is about nozzle part of oil jet for cooling piston in the automotive engine. The previous system cooled the lower part of piston only. So, efficiency was low. To improve this system, make the oil gallery in the piston, and oil flows into the gallery, The flux of oil flow rate into the gallery is important. Consequently, the point of this study is the research of investigation of flow characteristics for various radios of curvature and diameters of outlet of nozzle and various aspect ratio. This study has been modelled by a commercial CFD code FLUENT, allowing to assess this validity.