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논문 기본 정보

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연구보고서
저자정보
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한국자동차공학회 한국자동차공학회 기타 간행물 한국자동차공학회 기타간행물(Proceedings of UK)
발행연도
1998.11
수록면
173 - 193 (21page)

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High speed direct-injection diesel (HSDI) engine is a promising automobile power plant owing to its superior fuel economy. The effect of exhaust gas recirculation (EGR), one of the methods for reducing NO_x emissions, was investigated in this study. The effect of various levels of EGR on the combustion characteristics has been investigated in a direct injection optical diesel engine in terms of the cylinder pressure, flame development, temperature and KL-factor distributions. Images of the developing flame under twelve engine operating conditions including 1000rpm/idle, 2000rpm/2 bar bmep and 2000rpm/10bar bmep at 0%, 30% and 50%EGR rates were obtained by means of two CCD cameras, in the optical path. Analysis of these images has revealed that increased EGR rates lead to increased cyclic pressure variations during the warm-up period of the engine, reduced and more fragmented high-temperature regions, reduced flame core temperatures, generally reduced soot oxidation rates but similar ignition delay times. Overall, the effect of EGR on combustion increased with load and speed until a stage was reached at 50% EGR-rate and high load when combustion became unstable and the pressure trace highly non-repeatable

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ABSTRACT

INTRODUCTION

EXHAUST GAS RECIRCULATION

TWO-COLOR METHOD

EXPERIMENTAL SYSTEM

RESULTS AND DISCUSSION

CONCLUSIONS

REFERENCES

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