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중형 직분식 디젤 엔진의 0-D Multi-zone 연소 모델 및 1-D Cycle Simulation 연계 기법 개발
최승목(Seungmok Choi),민경덕(Kyoungdoug Min),김기두(Ki-doo Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.6
본 연구에서는 중형 직분식 선박용 엔진의 성능 및 NOx 배출물 예측을 위한 0-D multi-zone 분무 연소 모델이 개발되었다. 모델은 상용 1-D 사이클 해석 프로그램 (Boost)와 연동할 수 있도록 개발되었으며, 흡배기 시스템을 포함한 엔진 전체에 대한 동시 해석이 가능하였다. 연소 모델은 Fortran90 으로 개발되었으며, AVL 에서 제공된‘user defined high pressure cycle (UDHPC) interface’를 통해 Boost 와 연동되었다. 두 가지의 인젝터(8 홀, 10 홀)에 대해 두 가지 부하에서 해석을 수행하였으며, 해석 결과는 실제 엔진의 성능 실험 결과를 잘 추종하였다. In this study, a 0D multizone spray-combustion model is developed for the estimation of the performance and NOx emission of medium-sized direct-injection marine diesel engine. The developed combustion model is coupled with the commercial 1D cycle-simulation model, Boost, to analyze the entire engine system, including the intake and exhaust. The combustion model code was generated using Fortran90, and the model was coupled with Boost by connecting the generated code to a user-defined high-pressure cycle (UDHPC) interface. Simulation was performed for two injectors (8 holes and 10 holes) and two engine loads (50% and 100%), and the results of simulation were in good agreement with engine performance test.
HCNG 연료 기반 가상의 대형 HCCI엔진 성능 특성에 관한 수치해석적 연구
윤원준(Wonjun Yoon),박정수(Jungsoo Park) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Homogeneous Charged Compression Ignition(HCCI) engine have been known as advanced combustion technology for automotive system. It can provide better thermal efficiency than conventional gasoline and leaner combustion behavior than diesel engine having reduced Nitric oxides(NOx) and Particulate matter(PM). Furthermore, its fuel flexibility can make possible in direct use of methane based fuel. However, its have had disadvantages in narrow operation region such as low speed-low load or high speed-high load conditions due to its difficulties in combustion control. One of the solutions to solve these problems it to use hydrogen additives on methane based main fuels. In this study, effects of hydrogen addition on HCCI engine were numerically investigated by cyclic analysis coupling with chemical reaction mechanism. By changing independent variables including hydrogen contents, equivalence ratio, intake temperature and compression ratio, combustion behavior and system efficiency were investigated and optimized using fractional factorial design of experiment, fundamentally.
1D 전산해석코드를 활용한 차량 엔진 냉각모듈의 성능 예측 및 최적화
이승호(S. H. Lee),김학준(H. J. Kim),차용길(Y. K. Cha),김광일(K. I. Kim) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.5
The performance of engine cooling system is influenced by various factors which are bumper, opening area of grill, radiator, condenser, cooling fan etc. To optimize the engine cooling system is important as well as improvement of component of engine cooling module. To predict performance of engine cooling system using the 1D simulation code is very helpful at early development stage because the simulation can reduce the time and cost of test. This study focuses on prediction of performance of engine cooling system using the 1D simulation code and optimization of engine cooling module using the Taguchi method.
1D 해석을 통한 배터리 냉각 시스템 성능에 관한 연구
박근서(Keunseo Park),임혜수(Hyesu Lim),공태윤(Taeyun Kong),김화성(Hwasung Kim),김충영(Chungyoung Kim),권태석(Taesuk Kwon) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
An investigation on battery cooling system has been conducted using 1D simulation. Commercial Software, KULI, is used for estimation of cooling performance with various battery conditions in this study. For investigation of the battery cooling system, some 1D modeling had been developed and various parametric studies had been conducted. Some specific current values according to driving condition were engaged in the simulation model to estimate cooling performance of this system. The simulations indicate that current cooling system meet the target (under 45℃) when driving conditions like US06, HW and the fastest speed mode and that environmental temperature is also can be critical design factor since an effect of natural convection was pretty critical when we consider natural convection.
중형 직분식 디젤 엔진의 0-D multi-zone 연소 모델 및 1-D cycle simulation 연계 기법 개발
최승목(Seungmok Choi),민경덕(Kyoungdoug Min),김기두(Ki-doo Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, a 0-D multi-zone spray combustion model is developed for performance and emission (NOx) prediction of middle size direct injection marine diesel. The developed combustion model is coupled with commercial 1-D cycle simulation model (Boost) to analyze full engine system including intake and exhaust. Combustion model code generated using Fortran90, and coupling with Boost is done by connecting generated code to 'user defined high pressure cycle (UDHPC) interface'. Simulation was performed in two different injectors (8 and 10 holes) and two different engine loads (50 % and 100 %) and the results of simulation had good agreement with engine test data in performance.
외장형 연료펌프를 사용한 LPLi 연료공급시스템에서의 연료상태량 변화 예측
김재형(Jaehyung Kim),윤여빈(Yubin Yoon),송춘섭(Chunsub Song),박영준(Youngjoon Park),이성욱(Seangwock Lee),조용석(Yongseok Cho) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The LPG(Liquefied Petroleum Gas) fuel attracts attention as a clean alternative fuel. In order to further reduce the exhaust emission and improve performance in LPG engines, the LPLi(Liquid Phase LPG Injection) system is used. In LPLi system, the fuel pump performance is important for keeping the LPG over its saturated vapor pressure. An external fuel pump is needed to improve the durability and the ease of maintenance for LPG engines. This paper predicted the variation of fuel properties on the LPLi system with an external fuel pump. From each components thermodynamic model, an 1-D simulation is developed for LPLi systerm with an external fuel pump. Then the 1-D simulation data analyzed and compared with the rig-test and chassis dynamometer test. The 1-D simulation, the rig-test and the chassis dynamometer test produced similar results.