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논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
한국자동차공학회 한국자동차공학회 춘 추계 학술대회 논문집 한국자동차공학회 2000년 추계학술대회논문집 2호
발행연도
2000.11
수록면
173 - 180 (8page)

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Natural gas has been considered as one of the most promising alternative fuels for transportation due to its ability to reduce regulated pollutants and its abundance. However, since its combustion and emission characteristics are quite different from conventional liquid fuels such as gasoline and diesel, further investigation is required. The objective of this work was to examine the characteristics of combustion and the reduction of exhaust emissions from direct injection of compressed natural gas (CNG) in a purpose-built, multi-cylinder spark-ignition engine equipped with a four-valve cylinder head and offering optical access through an extended piston and windows in the liner. In addition, CNG jet development was examined in a constant-volume chamber using Schlieren photography in terms of jet cone angle and tip penetration. Baseline testing was performed with manifold injection of CNG, using direct imaging of the propagating flame with simultaneous measurement of in-cylinder pressure and exhaust emissions. For investigation of the effect of charge stratification induced through direct in-cylinder injection of CNG, a
sampling probe was incorporated into the spark plug for measuring the local hydrocarbon levels at the time of ignition. Overall, the results revealed that direct injection of CNG increases the volumetric efficiency of the engine relative to manifold injection and allows enhanced in-cylinder flow motion and charge stratification at the time of ignition. The resulting faster flame propagation and reduced cycle-to-cycle variations makes the CNG engine comparable in combustion performance with conventional gasoline-fuelled engines, while at the same time offering the potential for reduced NOx emissions as a result of the engine's leaner operating limit

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ABSTRACT

1.서론

2.실험장치 및 실험 방법

3.실험 결과 및 고찰

4.결론

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