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이 논문의 연구 히스토리 (4)

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A cylindrical constant volume combustion vessel is used to investigate the combustion characteristics of methane-air mixture by using 2-stage injection. To analyze the simplified heat balance, some terminologies including CHR (cumulative heat release) ratio, UHC (unburned hydrocarbon) ratio and TL (total loss) ratio are defined. The result shows that the effect of the stratification on combustion characteristics is not significant in the case of the overall excess air ratio of 1.1. In the case of the overall excess air ratio of 1.4, as the initial charge pressure is increases, the CHR ratio has been decreased, while the TL ratio has been increased. Generally, as the initial charge pressure increases, the amount of injection mixture has been decreased and has resulted in lower mean velocity and turbulent intensity. Also, the excess air ratio of injection mixture is too rich to result in mixing deficiency around the spark electrode gap in the combustion vessel. From these results, it could be possible to acquire some optimal conditions which have higher thermal efficiency and lower total loss than those of homogeneous conditions through the 2-stage injection in CNG direct injection engine

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Abstract

1.서론

2.실험장치 및 방법

3.실험결과 및 고찰

4.결론

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UCI(KEPA) : I410-ECN-0101-2009-556-014208222