Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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A Numerical Study on Effects of Pilot Injection on Combustion and Emission Characteristics in a Marine Diesel Engine

선박용 디젤 엔진에서 Pilot 분사가 연소 및 배기 특성에 미치는 영향에 관한 수치해석적 연구

  • 배명직 (부산대학교 기계공학과 대학원) ;
  • 한동식 (부산대학교 기계공학과 대학원) ;
  • 김현규 (부산대학교 기계공학과 대학원) ;
  • 장영준 (부산대학교 기계공학부) ;
  • 송주헌 (부산대학교 기계공학부) ;
  • 전충환 (부산대학교 기계공학부)
  • Published : 2010.01.31
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Abstract

Computational simulation has been carried out to examine the effects of pilot injection to reduce both of NOx and Soot emissions in a marine diesel engine. For verification of the computational result, calculated cylinder pressure was matched to experimental pressure. In this study, the primary variables were injection timing, dwell time and injection rate while the amount of injection fuel was maintained constant. It was revealed that variation of pilot injection timing affects auto ignition and heat release rate. In the results, both of NO and soot emission were reduced without deterioration of in-cylinder pressure under the condition of $10^{\circ}$CA dwell time and 0.022kg/s injection rate.

본 논문에서는 박용 디젤엔진에서 NOx와 Soot의 배출량을 동시에 줄이기 위해 파일럿 분사의 특성을 알아보기 위해서 수치해석을 수행하였다. 수치해석결과의 압력 선도는 실험 결과와 일치시켜 1.6% 범위의 적은 오차에서 예측함으로써 수치해석의 신뢰성을 검증하였고 총 분사량이 고정된 상태에서 분사시기, 분사휴지 기간, 분사율을 주요 파라미터로 적용하였다. 파일럿 분사시기의 변화는 연료의 자발화와 열발생률에 영향을 주는 것을 결과로부터 알 수 있었다. 결과로부터 분사휴지기간이 $10^{\circ}$CA, 분사율이 0.022kg/s인 경우에 실린더의 압력 손실이 없는 범위에서 NOx와 Soot를 동시에 저감하는 결과를 얻을 수 있었다.

Keywords

References

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