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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
유상석(Yu, Sang-Seok),김한석(Kim, Han-Seok),이상민(Lee, Sang-Min),이영덕(Lee, Young-Duk),안국영(Ahn, Kook-Young) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
A dynamic model of proton exchange membrane fuel cell(PEMFC) system is designed to understand the performance of the PEMFC in residential power generator(RPG) over various balance of plant(BOP) options. In particular, since the performance of PEMFC system should be optimized for given operating ranges, it is necessary to design suitable BDP components which can support the operating ranges. The objective of this study is to develop a dynamic system model for the study of PEMFC performance over various BOP options. Therefore, a dynamic model is composed of a PEMFC stack model, a water management system model, a thermal management system model and a fuel/air supply model and the model is integrated under SIMULINK(R)environment. Basic simulation results will be presented.
바이오 디젤 혼합비에 따른 커먼레일 인젝터의 분사 및 내구특성에 관한 실험 연구
임석연 ( Seok Yeon Im ),김태범 ( Tae Bum Kim ),유상석 ( Sang Seok Yu ) 한국분무공학회 2011 한국액체미립화학회지 Vol.16 No.1
An object of this study is to understand the correlation of injection characteristics and injector dimensions according to biodiesel mixture. The Injection characteristics of different types of common-rail injectors are the number of nozzle holes (5~8), jet cone angle (146˚~153˚), hydraulic flow rate (830~900 ml/min) injection quantity and response time. Prior to characteristic experiment, the reference injector has been selected in 6 candidates injectors under the investigation of injected quantity according to the biodiesel mixture so that injector type can be determined. The injector is used for the characteristic experiment which varied the various operating conditions including pressure 23 MPa, 80 MPa, 160MPa, changing in injection duration 0.16 ms~1.2 ms and even mixture ratio. The result shows that the nozzle hole number and cone angle influence the injection quantity much more than nozzle hole diameter at low injection pressure and the nozzle hole diameter at high injection pressure, post injection duration.
이상민(Sang Min Lee),홍동진(Dong Jin Hong),안국영(Kook Young Ahn),이연화(Younhwa Lee),유상석(Sang Seok Yu) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
An experimental study on the design of a catalytic combustor for high temperature MCFC system has been performed. The roles of the catalytic combustor are to completely burn anode off-gas and to supply sufficient CO₂ to cathode channels. In order to avoid hot spots or fuel slippage, flow uniformity at the catalyst inlet was achieved by installing two crossing perforated plates between the catalyst and the mixing chamber with minimal pressure drop. Effects of inlet temperature and fuel composition on catalytic combustion have been tested in the present study. A Pd/Ce/Ni-Al₂O₃ catalyst was used for complete combustion of the off-gas at GHSV = 36,000.