Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Combustion and Emissions Characteristics of a Diesel Engine with the Variation of the HP/LP EGR Proportion

고압/저압 EGR 공급 비율에 따른 디젤 엔진의 연소 및 배기 특성

  • Park, Youngsoo (Division of Mechanical Engineering, School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science & Technology) ;
  • Bae, Choongsik (Division of Mechanical Engineering, School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science & Technology)
  • 박영수 (한국과학기술원 기계공학전공) ;
  • 배충식 (한국과학기술원 기계공학전공)
  • Received : 2014.04.22
  • Accepted : 2014.07.04
  • Published : 2014.11.01
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Abstract

The effects of high pressure and low pressure exhaust gas recirculation (HP/LP EGR) portion on diesel engine combustion and emissions characteristics were investigated in a 2.2 L passenger-car diesel engine. The po3rtion of HP/LP EGR was varied from 0 to 1 while fixing the mass flow rate of fresh air. The intake manifold temperature was lowered with the increasing of the portion of LP EGR, which led to the retardation of heat release by pilot injection. The lowered intake manifold temperature also resulted in low nitrogen oxide (NOx) emissions due to decreased in-cylinder temperature and prolonged ignition delay, however, the carbon monoxide (CO) emission showed opposite trend to NOx emissions. The brake specific fuel consumption (BSFC) was decreased as the portion of LP EGR increased due to lowered exhaust manifold pressure by wider open of turbocharger vane. Consequently, the trade-off relationship between NOx and BSFC could be improved by increasing the LP EGR portion.

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References

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