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RISS 인기검색어
- 검색키워드
- 저자 : 곽철우(Chulwoo Kwark) (검색결과 3 건)
- 무료
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곽철우(Chulwoo Kwark),김규보(Guybo Kim),최승환(Seunghwan Choi),정동수(Dongsu jeong),전충환(Chunghwan Jeon),장영준(Youngjune Chang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
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/>
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희박 예혼합 메탄-공기혼합기의 배기배출물 특성 : 비균질급기
곽철우(Chulwoo Kwark),최승환(Seunghwan Choi),전충환(Chunghwan Jeonm),장영준(Youngjune Chang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
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 Chromatograph 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 RI condition reduced more CO₂ and UHC concentration than that of HI or LI conditions. In case of Inhomogeneous conditon, 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 redued compared to any other conditons.<br/>
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희박 예혼합 메탄-공기 혼합기의 연소 및 배기 배출물 특성: 균질급기
조승완(Seungwan Cho),최승환(Seunghwan Choi),곽철우(Chulwoo Kwark),전충환(Chungwhan Jeon),장영준(GYoungjuen Chang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A Cylindrical constant volume combustion chamber was used to investigate the combustion and exhaust characteristics of a homogeneous charge methane-air mixture under various overall charge pressures, excess air ratios and ignition times. Combustion pressure development measured by piezoelectric pressure transduce 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 combustion duration, flame 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 CO,In this paper, the effects of ethanol blended gasoline on emissions and their catalytic conversion efficiencies characteristics were investigated in a electronic fuel injection gasoline engine. The results showed that the increase of ethanol concentration in the blended fuels brings about the reduction of THC and CO₂ emissions from the gasoline engine were improved. THC emissions were drastically reduced by up to thirty percent. And brake specific fuel consumption was increased, but brake specific energy consumption could be improved. However, unburned ethanol and acetaldehyde emissions increased. The conversion efficiency of pt/Rh based three-way catalysts and the the effect of ethanol on CO and NOx emissions were investigated by the change of engine's speed, load and air/fuel ratio. Furthermore, the effect of ethanol blended fuel on the reduction of THC, CO and NOx emissions at idle speed. concentration was proportional to the ignition time and overall charge pressure, the 0₂, concentration was proportional to the excess air ratio, and the UHC concentration was inversely proportional to the ignition time and overall charge pressure.<br/>
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