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오일분리 장치 형상 변화에 따른 오일분리 성능에 관한 해석적 연구
우근섭(Keun-Sup Woo),박영준(Young-Joon Park),조용석(Yong-Soek Cho) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A closed crankcase ventilation (CCV) system has been adopted to engines to reduce blow-by gas emission. In the CCV system, blow by gas which contains engine lubricant oil is circulated to intake system. The system has a problem on blow-out of engine lubricant oil. To reduce loss of the engine oil, high efficiency oil separation devices are required. Principle of cyclone oil separator is centrifugal force in the separator, and oil separator designs influence on rotational flow which causes the centrifugal force. In this paper, oil separation performances for cyclone type designs are calculated with CFD methodology. The major design parameters considered in the analysis model are inlet area, cone length, and outlet depth of the oil separator. From the numerical analysis results, reducing inlet area and increasing cone length seem to increase oil separation performance. Changes in outlet depth could avoid interference between rotational flow and outlet flow in the cyclone oil separator.
사이클론 유입부 형상에 따른 오일분리 성능에 관한 해석적 연구
김형구(Hyung-Gu Kim),우근섭(Keun-Sup Woo),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In a closed type crankcase ventilation system, blow-by gas is recirculated into an intake system from the crankcase. The oil mist in the blow-by gas leads to an increase in harmful emissions, and thus causes several engine problems. Therefore, an efficient oil separator should be suggested to reduce oil mist in the blow-by that causes severe increase in oil consumption and problems including emission issue. Cyclone oil separator has several advantages such as no use of additional power, lifetime durability and low cost. The major principle of cyclone oil separator is the centrifugal force of gas flow in the separator and design parameters that influence on radial flow which causes the centrifugal force should be carefully investigated. In this paper, flow characteristics and oil separation performances with various inlet angles and inlet widths of a cyclone are calculated with CFD methodology. As results, inlet angle and inlet width influence on rotational flow complicatedly, and inlet angle of cyclone influences on vortex that disturbs rotational flow.