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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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