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[가솔린엔진] 오일유막의 연료 흡수 및 방출에 관한 연구
유상석(Sang Seok Yu),민경덕(Kyoungdong Min) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An oil layer fuel absorption/desorption modeling was developed. Multi- component fuel model has showed more reasonable condition than single component model. Henry's constant which is related to solubility is the most important variable in the oil layer absorption/desorption mechanism. The oil segments close to the top of the cylinder liner have more significant contribution to the fuel absorption and desorption process than other oil segments. At the warmed-up condition, the effect of the engine speed on the percent fuel absorbed/desorbed is minimal. But at low oil film temperature, percent of fuel absorbed/desorbed is decreased with increasing the engine speed because of low value of molecular diffusion coefficient of fuel. The amount of fuel trapped in the piston crevice is from 2 to 2.3 times larger than that of fuel in the oil film. However, fuel from oil film slowly desorbs into the combustion chamber compared with fuel from the piston crevices when the engine is cold
차량 주행 시뮬레이션을 이용한 디젤 엔진 운전 변수 최적화
방정환(Junghwan Bang),민경덕(Kyoungdong Min),이수원(Suwon Lee),김현옥(Hyun-Ok Kim),박종남(Jong-Nam Park),임훈섭(Hun-Seob Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper engine response functions of performance and emission were made using a design of experiments and real engine experiment data. Using vehicle driving mode simulation (UDDS : Urban Dynamometer Driving Schedule) engine operating points were achieved and engine operating parameters were optimized in a specific vehicle test mode using an optimization algorithm.
[디젤엔진부문] 축소 화학반응 모델링에 의한 탄화수소 연료의 점화지연 특성
김형욱(Hyunguk Kim),배상수(Sangsoo Pae),민경덕(Kyoungdong Min) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Reduced chemical kinetics model has been derived, which can be applicable for ignition model of hydrocarbon fuels, and contains 23 reactions and 18 species. The present model is validated with the experimental data, where the ignition delays of several hydrocarbon fuels, such as n-heptane, i-octane, n-decane and DME(dimethylether), are measured as equivalence ratios are varied. Especially, the effects of different fuels on ignition delays can be explained by changing the rate constants of three reactions among the present model. As a result, the proposed model can be applicable to two stage ignition model of Diesel combustion
작동조건을 고려한 자동차용 PEM 연소전지 시스템 성능 시뮬레이션
방정환(Jung-hwan Bang),김한상(Han-sang Kim),이동훈(Dong-hun Lee),민경덕(Kyoungdong Min),김민수(Min-soo Kim),조영만(Youngman Cho) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The modelingn of PEM (proton Exchange Membrane) fuel cell system consisting of fuel cell stack and BOP (Balance of plant) is presented in this paper. The effects of temperature, pressure (ail, hydrogen). and humidity on the fuel cell system performsnce were mainly investigated using thermo-dynamical and electro-chemical equations. To understand the power distribution characteristics of fuel cell system, the effrcts of operating temperature and air pressure on maximum power and system power were also demonstrated. Through this study, we can get the basic insight into the fuel cell stack and BOP component sizing and it can be used effectively for optimization of the practical fuel cell systems in purpose.