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바이오디젤 혼합 연료에 커먼레일 디젤기관에서 예비 분사시기가 연소 및 배기 특성에 미치는 영향

Effects of pilot injection timing on the Combustion and Emission Characteristics in a Common Rail Diesel Engine with Bio-diesel blended fuel

  • 투고 : 2014.01.08
  • 심사 : 2014.05.08
  • 발행 : 2014.05.31

초록

본 연구는 4실린더 커먼레일 디젤 기관에서 바이오 디젤 혼합 연료를 사용하여 예비 분사시기와 EGR율을 변화시켰을 때 연소 압력과 배기 특성에 미치는 영향을 조사하기 위하여 실험을 수행하였다. 예비 분사 시기와 EGR율은 디젤 기관의 연소 및 배기 배출 특성에 큰 영향을 미친다. 본 연구에서는 일반적으로 많이 사용되고 있는 기관 회전 속도 2,000rpm에서 바이오 디젤 혼합율 20%의 연료를 사용하여 예비 분사 시기와 EGR율에 다양하게 변화를 주어 실험을 하였다. 실험결과, 도시 평균 유효 압력은 예비 분사 시기가 상사점전 BTDC $10^{\circ}$에서 가장 높았으며, 연소 압력과 열 발생율은 동일 예비 분사 시기에서 EGR율에 비례하여 감소하였다. NOx배 출량은 예비 분사시기에 관계없이 EGR율이 증가할수록 큰 폭으로 감소하였으며, 매연(Soot)은 예비 분사 시기 BTDC $20^{\circ}$에서 가장 적게 배출되었다.

An experimental study was performed to investigate the characteristics of combustion pressure and exhaust emissions when the pilot injection timing and EGR rate were changed in a CRDI 4-cylinder diesel engine using bio-diesel blended fuel. The pilot injection timing and EGR rate have a significant impact on the combustion and emission characteristics of diesel engine. In this study, the pilot injection timing and EGR rate variation were conducted to 2000rpm of engine speed with fuel of bio-diesel blended rate 20%. In these experimental results, IMEP was shown maximum pressure at pilot injection timing BTDC$10^{\circ}$ combustion pressure and heat release rate were decreased in proportion to increase of EGR rate under the same pilot injection timing conditions. The NOx emission was decreased with increasing the EGR rate without influence on pilot injection timing. However, soot emission was reduced to a minimum at pilot injection timing BTDC$20^{\circ}$.

키워드

참고문헌

  1. M.S. Graboski R.L. McCormick, "Combustion of fat and vegetable oil derived fuels in diesel engines", Prog. Energy combust. Sci 24, 125-164, 1998. DOI: http://dx.doi.org/10.1016/S0360-1285(97)00034-8
  2. R.L. McCormick, C.J Tennant, R.R. Hayes, S.Black, Sharp, "Regulated Emissions from Biodiesel Tested in Heavy Duty Engines Meeting 2004 Emission Standards" SAE 2005-01-2200, 2005.
  3. S.H. Yoon, S.H. Park, C.S. Lee, "Experimental investigation on the fuel properties of biodiesel and its bledds at various temperatures", Energy and Fuels 22, 653-656, 2008. DOI: http://dx.doi.org/10.1021/ef7002156
  4. S.C. Kim, "A Study on the Characteristics of Fuel Consumption and Emissions of Diesel Vehicles Using Engine Coolant Flow Rate On/Off Control", KAIS, Vol. 14, No. 5 pp. 2069-2074, 2013. DOI: http://dx.doi.org/10.5762/KAIS.2013.14.5.2069
  5. D.Y. Chang, J.H. Van Gerpen, "Determination of particulate and unburned hydrocarbon emissions from diesel engines fuled with biodiesel" SAE paper 982527, 1998. DOI: http://dx.doi.org/10.4271/982527
  6. S.K Yoon and N.J Choi, "The effects of partially premixed pilot injection timing on the combustion and emission characteristics in a common rail diesel engine", KSPSE Vol. 17 No. 6, pp. 18-24, 2013. https://doi.org/10.9726/kspse.2013.17.6.018