Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Study of Combustion Characteristics with Compression Ratio Change in Ultra-Lean LPG Direct Injection Engine

압축비 변화에 따른 초희박 직접분사식 LPG엔진의 연소특성 연구

  • Cho, See Hyeon (Dept. of Mechanical Engineering, Gachon Univ.) ;
  • Yoon, Jun Kyu (Dept. of Mechanical Engineering, Gachon Univ.) ;
  • Park, Cheol Woong (Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Oh, Seung Mook (Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials)
  • 조시현 (가천대학교 기계공학과) ;
  • 윤준규 (가천대학교 기계공학과) ;
  • 박철웅 (한국기계연구원 그린동력연구실) ;
  • 오승묵 (한국기계연구원 그린동력연구실)
  • Received : 2014.05.07
  • Accepted : 2014.07.29
  • Published : 2014.10.01
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Abstract

Automotive manufacturers have recently developed various technologies for improving fuel economy and satisfying enhanced emission regulations. The ultra-lean direct injection engine is a promising technology because it has the advantage of improving thermal efficiency through the deliberate control of ignition. A conventional LPG engine has been redesigned to an ultra-lean-burn LPG direct injection engine in order to adopt combustion system of ultra-lean-burn. This study is aimed at investigating the effect of a change in the compression ratio on the performance and emission characteristics of a lean-burn LPG engine. The fuel consumption, heat release rate, combustion pressure, and emission characteristics are estimated depending on changing the effect of compression ratio. When the compression ratio is increased, it is difficult to improve the fuel consumption owing to an unstable combustion state, but the total hydrocarbon and nitrogen oxide emissions are reduced.

최근 자동차 제조사는 강화되는 배출가스 규제를 만족시키고 엔진 효율을 향상시키기 위해 다양한 기술을 연구하고 있다. 그 중 직접분사식 초희박 연소기술은 정밀한 연소제어를 통해 연소효율을 극대화 하고 연비를 향상시킬 수 있는 차세대 기술로 평가받고 있다. 기존 가스엔진에 초희박 직접분사기술을 적용하기 위해 기존의 MPI 엔진의 헤드를 재설계하였다. 기존 압축비10:1에서 12:1로 증가시킴으로써 이에 따른 압력선도, 열방출률, 연료소비율 등의 연소특성과 배출가스특성을 파악하였다. 압축비를 증가시킴에 따라 불안정한 연소상태로 인하여 연료소비율의 개선이 어려웠으나 탄화수소(THC)와 질소산화물(NOx)의 배출은 감소되었다.

Keywords

References

  1. Takagi, Y., 1996, "The Role of Mixture Formation in Improving Fuel Economy and Reducing Emissions of Automotive S.I. Engines," FISITA Technical Paper, No. P0109.
  2. Husted, H., Piock, W. and Ramsay, G., 2009, "Fuel Efficiency Improvements from Lean Stratified Combustion with a Solenoid Injector," SAE paper 2009-01-1485.
  3. Park, C. W., Oh, J. W. and Kim, H. S., 2012, "A Study on the Lean Combustion Characteristics with Variation of Combustion Parameter in a Gasoline Direct Injection Engine," Trans. of KSAE, Vol. 20, No. 4, pp. 39-45. https://doi.org/10.7467/KSAE.2012.20.4.039
  4. Kim, S. J., Kim, Y. N. and Lee, J. H., 2008, "Analysis of the In-Cylinder Flow, Mixture Formation and Combustion Processes in a Spray-Guided GDI Engine," SAE paper 2008-01-0142.
  5. Dardalls, D., Matthews, R. D., Lewis, D. and Davis, K., 1998, "The Texas Project, Part-Economic Analysis: CNG and LPG Conversion of Light-Duty Vehicle Fleets," SAE paper 1998-10-19
  6. Szekely, G. A. and Alkiads, A. C., 2005, "Combustion Characterisics of a Spray-Guided Dierec-Injection Stratified-Charge Engine with a High-Squish Piston," SAE paper 2005-01-1937.
  7. VanDerWege, B. A., Han, Z., Lyer, C. O., Munoz, R. B., and Yi, J., 2003, "Development and Analysis of a Spray-Guided DISI Combustion System Concept," SAE paper 2003-01-3105.
  8. Honda, T., Kawamoto, M., Katashiba, H., Sumida, M., Fukutomi, N., and Kawajiri, K., 2004, "A Study of Mixture Formation and Combustion for Spray Guided DISI," SAE paper 2004-01-0046.
  9. Park, C. W., Park, W. S., Oh, S. M., Lee, Y. G., Kim, T. Y., Kim, H. S., Choi, Y. and Kang, K. Y., "Emission Characteristics of Gasoline and LPG in a Spray-Guided-Type Direct Injection Engine," SAE paper 2013-01-1323
  10. Park, Y. S., Park, C. W., Oh, S. M., Kim, T. Y., Choi, Y. and Lee, Y. G., 2013, "Study of Combustion Characteristics with Variations of Combustion Parameter in Ultra-Lean LPG Direct Injection Engine," Trans. Korean Soc. Mech. Eng. B, Vol. 37, No. 6, pp. 607-614. https://doi.org/10.3795/KSME-B.2013.37.6.607