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정적연소기에서의 메탄-공기혼합기의 성층연소 및 배기배출물 특성
곽철우(Chul-woo Kwark),김규보(Guy-bo Kim),최승환(Seung-hwan Choi),전충환(Chung-hwan Jeon),장영준(Young-june Chang) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.10
Recently many studies related to the lean-burn technology of gas engine have been carried out to improve fuel enconomy by minimizing the reduction of power output and to reduce exhaust emisson. Lean combustion is effective way of improving fuel economy and reducing emission gas of S.I. It is investigated that the effect of initial pressure, excess air ratio and ignition time on combustion performance and exhaust emission characteristics of stratified pattern in a cylinderical constant volume combustion chamber. Gas Chromatography is used to determine the CO2, CO, O2, UHC concentrations in the chamber. The measurement of methane-air mixture are performed excess air ratio varing from 1.1 to 1.4 . As a result, in the case of RI shows better exhaust emission characteristics. Especially Rl condition reduced more CO2 and UHC concentration than that of HI or LI conditions. In case of Inhomogeneous condition, UHC and CO2 is reduced in accordance with increasing initial charge pressure but O2 is reduced. Especially, when the excess air ratio of initial charge mixture is 3, UHC and CO2 is reduced compared to any other conditions.
최승환(Seung-hwan ChOi),곽철우(Chul-woo Kwark),전충환(Chung-hwan Jeon),장영준(Young-june Chang) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5
A cylindrical constant volume combustion chamber was used to investigate the flow characteristics at spark plug and the combustion characteristics of inhomogeneous charge methane-air mixture under several parameters. The flow characteristics such as mean velocity and turbulence intensity was analyzed by hot wire anemometer. The role of mixture stratification on combustion rate has been investigated in a C.V.C.C in which mixtures of different excess air ration can be added in a spatially and temporally controlled fashion. The experiments were performed that various stratification patterns which had different concentration distributions were obtained by means of variation of the concentration of the initial charge mixture and injection mixture at the fixed overall excess air ratio.<br/> <br/>
정적연소기에서 메탄-공기 혼합기의 균질연소 및 배기배출물 특성
조승완(Seung-wan Cho),최승환(Seung-hwan Choi),곽철우(Chul-woo Kwark),전충환(Chung-whan Jeon),장영준(Gyoung-juen Chang) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.10
A Cylindrical constant volume combustion chamber was used to investigate the flow characteristics at the spark electrode gap and the combustion characteristics of a homogeneous charge methane-air mixture under various overall charge pressures, excess air ratios and ignition times. The !low characteristics, including the mean velocity and turbulence intensity, were analyzed by hot wire anemometer. Combustion pressure development measured by piezoelectric pressure transducer, a flame propagation image acquired by ICCD camera and exhaust emissions measured by 2-valve gas chromatography were used to investigate the effects of initial pressures, excess air ratios and ignition times on the combustion characteristics.<br/> It was found that the mean velocity and turbulence intensity had the maximum value around 200-300 ms and then decreased gradually to a near-zero value after 3000 ms, and that the combustion duration, !lame speed and burning velocity had good characteristics under the conditions of an excess air ratio of 1.1, an overall charge pressure of 0.15 MPa and an ignition time of 300 ms in the present study. And the CO₂concentration was proportional to the ignition time and overall charge pressure, the O₂concentration was proportional to the excess air ratio, and the UHC concentration was inversely proportional to the ignition time and overall charge pressure.