Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study on Combustion and Emission Characteristics of Diesel-DME Blended Fuels Using Pilot Injection in DICI Engine

직접분사식 압축착화엔진에서 Pilot분사에 따른 Diesel-DME 혼합연료의 연소 및 배기특성에 관한 연구

  • Jeong, Jaehoon (Graduate of Mechanical Engineering, Ulsan University) ;
  • Lim, Ocktaeck (School of Mechanical Engineering, Ulsan University)
  • 정재훈 (울산대학교 대학원 기계공학과) ;
  • 임옥택 (울산대학교 기계공학부)
  • Received : 2013.07.11
  • Accepted : 2013.09.23
  • Published : 2014.05.01
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Abstract

This work was investigated on pilot injection strategy of blended fuels(Diesel-DME) for combustion and emissions in a single cylinder direct injection compression ignition engine. Diesel and DME were blended by the method of weight ratio. Weight ratios for diesel and DME were 95:05 and 90:10 respectively. dSOI between main and pilot injection timing was varied. A total amount of injected fuels(single injection) was adjusted to obtain the fixed BMEP as 4.2 bar in order to compare with the fuel conditions. Also, the amount of pilot injection fuel was varied by 5%, 10% and 20% of total injection fuel. The engine was equipped with common rail and injection pressure is 700 bar at 1200 rpm. As a result, when mixing ratio increase, indicated thermal efficiency was increased in comparison with DD 100 and CO, THC and smoke were lower than DD 100. The influence of reducing NOx by pilot injection was more effective than DD 100. When pilot injection quantity increase, abrupt increase of NOx was occured at pilot injection quantity of 20%.

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References

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  1. Effect of pre-post injection timing of diesel fuel for naval vessel on the combustion and emission characteristics in an optically-accessible single cylinder diesel engine vol.38, pp.7, 2014, https://doi.org/10.5916/jkosme.2014.38.7.868