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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국자동차공학회 한국자동차공학회논문집 한국자동차공학회논문집 제11권 제6호
발행연도
2003.11
수록면
86 - 92 (7page)

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초록· 키워드

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To analyze the characteristics of ozone formation, measurements of the concentrations of individual exhaust hydrocarbon species have been made under various engine operating parameters in a 2-liter 4-cylinder engine for natural gas and LPG. Tests were performed at constant engine speed, 1800 rpm for two compression ratios of 8.6 and 10.6, with various operating parameters, such as excess air ratio of 1.0~1.6, bmep of250~800 kPa and spark timing of BTDC 10~55°. It was found that the natural gas gave the less ozone formation than LPG in various operating conditions. This was accomplished by reducing the emissions of propylene(C₃
H_6), which has relatively high maximum incremental reactivity factor, and propane(C₃H_8) that originally has large portion of LPG. In addition, the natural gas show lower values in the specific reactivity and brake specific reactivity.
Higher compression ratio of the test engine showed higher non methane HC emissions. However, specific reactivity value decreased since fuel species of HC emissions increase. brake specific reactivity showed almost same values under high bmep, over 500kPa for both fuels. This means that the increase of non methane HC emissions and the decrease of specific reactivity with higher bmep affect each other simultaneously. With advanced spark timing, brake specific reactivity values of LPG were increased while those of natural gas showed almost constant values.

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Abstract

1.서론

2.실험장치 및 방법

3.결과 및 고찰

4.결론

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