Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Injection Characteristics of Direct Injection CNG Fuel

직접분사 CNG 연료의 분사특성에 관한 연구

  • Lee, S.W. (Department of Automotive Engineering, Kookmin Univ.) ;
  • Rogers, T. (School of Aerospace, Mechanical and Manufacturing ENG, RMIT University) ;
  • Petersen, P. (School of Media and Communication, RMIT University) ;
  • Kim, I.G. (Graduate School of Automotive Engineering, Kookmin Univ.) ;
  • Kang, H.I. (Department of Automotive Engineering, Daelim Univ.)
  • 이성욱 (국민대학교 자동차공학과) ;
  • ;
  • ;
  • 김인구 (국민대학교 자동차공학전문대학원) ;
  • 강호인 (대림대학교 자동차공학과)
  • Received : 2014.03.28
  • Accepted : 2014.12.31
  • Published : 2014.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

Two types of fuel supply method ar used in CNG vehicles. One is premixed ignition and the other is gas-jet ignition. In premixed ignition, the fuel is introduced with intake air so that homogeneous air-fuel mixture may form. The ignitability of this method depends on the global equivalence ratio. In gas-jet ignition, CNG is introduced directly into the engine combustion chamber. The overall mixture is stratified by retarded fuel injection. In this study, a visualization technique was employed to obtain fundamental properties regarding overall mixture formation of direct injected CNG fuel inside a constant volume chamber. Jet angles, penetrations and projected jet area with respect to ambient pressure are investigated. The penetration decreases apparently and the time reaching the CVC wall was delayed as the chamber pressure increases. This is caused by the higher inertia of the fluid elements that the injected fluid must accelerate and push aside. It is same to liquid fuel such as diesel and gasoline, but this phenomenon is far more prominent for the gaseous fuel.

Keywords

References

  1. H. M. Cho and B. Q. He, Spark ignition natural gas engines, Energy Conversion and management, 48 (2007), pp. 608-618. https://doi.org/10.1016/j.enconman.2006.05.023
  2. R. Tilagone, S. Venturi and G. Monnier, Natural gas - an environmentally friendly fuel for urban vehicles: the SMART demonstrator approach, Oil & Gas Science and Technology, 61 (2006), pp. 155-164. https://doi.org/10.2516/ogst:2006010x
  3. M. Ali,Y. Kidoguchi, Y. Oka and T. Kaida, Improvement of combustion of CNG engine using CNG direct injection and gas-jet ignition method, SAE Paper No. 2011-01-1994 (2011).
  4. S. Taniguchi, Y. Tsukasaki and A. Yasuda, Study of compressed natural gas injection engine, FISITA paper No. F2006P089 (2006).
  5. M. Baratta, A. E. Catania, E. Spessa, L. Herrmann and K. Roessler, Multi-dimensional modelling of direct natural gas injection and mixture formation in a stratified-charge SI engine with centrally mounted injector, SAE Int. J. of Engines 1 (2008), pp. 607-626. https://doi.org/10.4271/2008-01-0975
  6. Z. Huang, S. Shiga, T. Ueda, H. Nakamura,T. Ishima,T. Obokata, M. Tsue and M. Kono, Combustion characteristics of natural-gas direct-injection combustion under various fuel injection timings, Proc. of the IMechE, 217(5) (2003), pp. 393-401.
  7. Y. Kidoguchi, S. Masaaki, U. Hiromitsu and K. Miwa, A fundamental study on improvement of ignitability and combustion stability of CNG jet, Trans. of JSAE, 36 (1), pp. 15-20.
  8. R. D. Nine, N. N. Clark, B. E. Mace and L. ElGazzar, Hydrocarbon speciation of a lean burn spark ignited engine, SAE Paper No. 972971 (1997).
  9. E. W. Deanna and C. W. Harry, Direct injection compressed natural gas combustion and visualization, SAE Paper No. 2000-01-1838 (2000).
  10. S. Riccardo,W. Thomas, M. Nicholas, S. Victor and K. Sebastian, Mixture formation in direct injection hydrogen engines: CFD and optical analysis of single and multi-hole nozzles, SAE Paper No. 2011-24-0096 (2011).
  11. S. Turns, An Introduction to Combustion. 2nd ed. McGraw-Hill. New York (1988).
  12. L. Johansen, E. Sienes, and P. Dahlander, Analysis of transient compressible gas jets using high speed Schlieren imaging, SAE Paper No. 2013-01-0871 (2013).
  13. S. W. Lee, D. S. Baik, T. Rogers and P. Petersen, Characteristics of CNG fuel engine, Advanced Science and Technology Letters Vol.33 (Bioscience and Medical Research), pp.29-32, (2013)
  14. Benjamin R. Petersen, Transient High - Pressure Hydrogen Jet Measurement, University of Wisconsin - Madison, pp.16, (2006)