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GDI엔진의 밸브리프트 변화에 따른 연소실내 흡기유동 및 연료분포에 대한 수치 해석적 연구
김경배 ( K. B. Kim ),송미지 ( M. J. Song ),김구성 ( K. S. Kim ),강석호 ( S. H. Kang ),이영훈 ( Y. H. Lee ),이성욱 ( S. W. Lee ) 한국분무공학회 2013 한국액체미립화학회지 Vol.18 No.2
While variable value actuation or variable valve lift (VVL) is used increasingly in spark ignition (SI) engines to improve the volumetric efficiency or to reduce the pumping losses, it is necessary to understand the impact of variable value lift and timing on the in-cylinder gas motions and mixing processes. In this paper, characteristics of the in-cylinder flow and fuel distribution for various value lifts (4, 6, 8, 10mm) were simulated in a GDI engine. It is expected that the investigation will be helpful in understanding and improving GDI combustion when a VVL system is used. The CFD results showed that a increased value lift could significantly enhance the mixture and in-cylinder tumble motion because of the accelerated air flow. Also, it can be found that the fuel distribution is more affected by earlier injection (during intake process) than that of later injection (end of compression). These may contribute to an improvement in the air-fuel mixing but also to an optimization of intake and exhaust system.
백두성(D. S. Baik),김구성(K. S. Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Performance of heat-exchanger very important in any mechanical systems. Diversified study on heat exchangers has been based on this new-concept of a heat-exchanger. Meanwhile many designs to release effectively heat from automobile engine have been sought for. This research aims to provide design concepts on a plate type heat-exchanger after computing an optimized heat flux under given several different parameters such as refrigerants and inside pressures by using ANSYS commercial program.