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GT-Power기반 디젤 배기밸브 제어모델 개발 및 연소 특성 해석
이유민 ( Y. M. Lee ),조인수 ( I. S. Jo ),김주현 ( J. H. Kim ),이진욱 ( J. W. Lee ) 한국액체미립화학회 2018 한국액체미립화학회지 Vol.23 No.1
In this study, the effects of variation in cam phasing and valve lift of exhaust valves by using Cam-in-Cam system on combustion and emission characteristics for diesel engine were investigated under GT-POWER simulation environment. This paper showed analytic result of combustion characteristics and diesel exhaust valve's control with GT-Power 1-D detail model. As a result, it was found that volumetric efficiency and IMEP were decreased as the exhaust valve opening and closing timing is advanced due to its internal EGR effects. Also, it was found that NOx emission were decreased as EVC timing was retarded. These show that the retarding the exhaust valve closing and opening while keeping the duration at constant can be effective for controlling AFR and mixing rate in diffusion combustion of diesel engine.
GT-Power기반 Cam-In-Cam 가변밸브작동에 따른 스월유동 및 연소특성 해석
이유민,조인수,김주현,박승우,이진욱,Lee, Y.M.,Jo, I.S.,Kim, J.H.,Park, S.W.,Lee, J.W. 한국분무공학회 2018 한국액체미립화학회지 Vol.23 No.2
An analytic strategy to control the variable valve actuation applied to two intake valves (flow port intake valve and swirl port intake valve) was performed in this study. we considered the variation in phasing of intake valve profiles by using the Cam-in-Cam technology. The analytic model was implemented in the GT-Power simulation program and analyzed the result of regulated emissions such as, NOx and Soot, especially with IMEP characteristics. Namely, we meticulously investigated the sources of having effect on the amount of NOx and soot formation under the test conditions with retard timing of both flow port and swirl port intake valves for decreasing the opening duration by 35CAD. Also, we analyzed the effect of incylinder pressure and temperature with NOx variations and in-cylinder pressure and temperature on NOx variations and normalized turbulent intensity. Through this analysis, some useful results on the combustion and flow characteristics of the swirl port and flow port control of the intake valve were obtained by this study.