Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

LPG-DME Compression Ignition Engine with Intake Variable Valve Timing

LPG-DME 압축착화 엔진에서 흡기 가변밸브 영향

  • Yeom, Ki-Tae (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Bae, Choong-Sik (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
  • 염기태 (한국과학기술원 기계공학과) ;
  • 배충식 (한국과학기술원 기계공학과)
  • Published : 2008.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

The combustion and exhaust emissions characteristics of a liquefied petroleum gas-di-methyl ether compression ignition engine with a variable valve timing device were investigated under various liquefied petroleum gas injection timing conditions. Liquefied petroleum gas was used as the main fuel and was injected directly into the combustion chamber. Di-methyl ether was used as an ignition promoter and was injected into the intake port. Different liquefied petroleum gas injection timings were tested to verify the effects of the mixture homogeneity on the combustion and exhaust emission characteristics of the liquefied petroleum gas-di-methyl ether compression ignition engine. The average charge temperature was calculated to analyze the emission formation. The ringing intensity was used for analysis of knock characteristics. The combustion and exhaust emission characteristics differed significantly depending on the liquefied petroleum gas injection and intake valve open timings. The CO emission increased as the intake valve open and liquefied petroleum gas injection timings were retarded. However, the particulate matter emission decreased and the nitrogen oxide emission increased as the intake valve open timing was retarded in the diffusion combustion regime. Finally, the combustion efficiency decreased as the intake valve open and liquefied petroleum gas injection timings were retarded.

Keywords

References

  1. F. Zhao, T. Asmus, D. Assanis, J. Dec, J. Eng and P. Najt, Homogeneous Charge Compression Ignition (HCCI) Engines : Key Research and Development Issues, TP-94, SAE, 2003
  2. K. Yeom, J. Jang, and C. Bae, "Homogeneous Charge Compression Ignition of LPG and Gasoline using Variable Valve Timing in an Engine," Fuel, Vol.86, No.4, pp.494-503, 2007 https://doi.org/10.1016/j.fuel.2006.07.027
  3. H. Ogawa, N. Miyamoto, N. Kaneko and H. Ando, "Combustion Control and Operating Range Extension in an Homogeneous Charge Compression Ignition Engine with Direct incylinder Injection of Reaction Inhibitors," International Journal of Engine Research, Vol.6, No.4, pp.342-360, 2005
  4. C. Baek, H. Yoon, K. Yeom, J. Jang and C. Bae, "The Effects of Hydrogen on DME HCCI Combustion," Transactions of KSAE, Vol.15, No.2, pp.15-21, 2007
  5. W. Ying, Z. Longbao and W. Hewu, "Diesel Emission Improvements by the Use of Oxygenated DME/Diesel Blend Fuels," Atmospheric Environment, Vol.40, No.13, pp.1313-2320, 2007
  6. J. Eng, "Characterization of Pressure Waves in HCCI Combustion," SAE 2002-01-2859, 2002
  7. J. B. Heywood, Internal Combustion Engine Fundamentals, McGraw Hill, New York, 1988
  8. A. Bertola, J. Stadler, T. Walter, P. Wolfer, C. Gossweiler and M. Rothe, "Pressure Indication during Knocking Conditions," 7th Internal Symposium on Internal Combustion Diagnostics, May 2006, Kurhaus Baden-Baden, Germany, pp.7-21, 2006
  9. C. Bae and K. Yeom, "LPG - DME Stratified Charge Compression Ignition Engine," Transaction of KSME, Vol.31, No.8, pp.672-679, 2007 https://doi.org/10.3795/KSME-B.2007.31.8.672
  10. H. Zhao and N. Ladommatos, Engine Combustion Instrumentation and Diagnostics, SAE, 2001
  11. M. Sjoberg and J. Dec, "An Investigation into Lowest Acceptable Combustion Temperatures for Hydrocarbon Fuels in HCCI Engines," Proceedings of the Combustion Institute, Vol.30, No.2, pp.2719-2726, 2005 https://doi.org/10.1016/j.proci.2004.08.132
  12. D. Mondal, A. Datta and A. Sarkar, "Droplet Size and Velocity Distributions in a Spray from a Pressure Swirl Atomizer: Application of Maximum Entropy Formalism," IMechE. Part C: Journal of Mechanical Engineering Science, Vol.218, No.7, pp.737-750, 2004 https://doi.org/10.1243/0954406041319563
  13. D. Tree and K. Svensson, "Soot Processes in Compression Ignition Engines," Progress in Energy and Combustion Science, Vol.33, No.3, pp.272-309, 2007 https://doi.org/10.1016/j.pecs.2006.03.002
  14. B. Stojkovic, T. Fansler, M. Drake and V. Sick, "High-speed Imaging of OH and Soot Temperature and Concentration in a Stratified- charge Direct-injection Gasoline Engine," Proceedings of the Combustion Institute, Vol.30, No.2, pp. 2657-2665, 2005 https://doi.org/10.1016/j.proci.2004.08.021
  15. K. Lee and C. Lee, "An Experimental Study of the Extent of the Operating Region and Emission Characteristics of Stratified Combustion Using the Controlled Autoignition Method," Energy and Fuels, Vol.20, No.5, pp.1862-1869, 2006 https://doi.org/10.1021/ef060037q