THERMAL SCIENCE

International Scientific Journal

UV-VISIBLE DIGITAL IMAGING OF SPLIT INJECTION IN A GASOLINE DIRECT INJECTION ENGINE

ABSTRACT
Ever tighter limits on pollutant emissions and the need to improve energy conversion efficiency have made the application of gasoline direct injection (GDI) feasible for a much wider scale of spark ignition engines. Changing the way fuel is delivered to the engine has thus provided increased flexibility but also challenges, such as higher particulate emissions. Therefore, alternative injection control strategies need to be investigated in order to obtain optimum performance and reduced environmental impact. In this study, experiments were carried out on a single-cylinder GDI optical engine fuelled with commercial gasoline in lean-burn conditions. The single-cylinder was equipped with the head of a commercial turbocharged engine with similar geometrical specifications (bore, stroke, compression ratio) and wall guided fuel injection. Optical accessibility was ensured through a conventional elongated hollow Bowditch piston and an optical crown, accommodating a fused-silica window. Experimental tests were performed at fixed engine speed and injection pressure, whereas the injection timing and the number of injections were adjusted to investigate their influence on combustion and emissions. UV-visible digital imaging was applied in order to follow the combustion process, from ignition to the late combustion phase. All the optical data were correlated with thermodynamic analysis and measurements of exhaust emissions. Split injection strategies (i.e. two injections per cycle) with respect to single injection increased combustion efficiency and stability thanks to an improvement of fuel air mixing. As a consequence, significant reduction in soot formation and exhaust emission with acceptable penalty in terms of HC and NOx were measured.
KEYWORDS
PAPER SUBMITTED: 2014-11-21
PAPER REVISED: 2015-05-25
PAPER ACCEPTED: 2015-05-29
PUBLISHED ONLINE: 2015-06-07
DOI REFERENCE: https://doi.org/10.2298/TSCI141121071M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE 6, PAGES [1873 - 1886]
REFERENCES
  1. Alagumalai, A., Internal combustion engines: Progress and prospects, Renew. Sust. Energ. Rev., 38 (2014), pp. 561-571
  2. F. Zhao, et al., Automotive spark-ignited direct-injection gasoline engines, Progress in Energy and Combustion Science, 25 (1999), 5, pp. 437-562
  3. Baumgarten, H., et al., Vehicle Application of a 4-Cylinder Characteristics in a Spray-Guided DISI Engine, SAE Technical Paper 2001-01-0735, (2011), doi:10.4271/2001-01-0735
  4. Oh, H., et al., Effect of the Multiple Injection on Stratified Combustion Characteristics in a Spray-Guided DISI Engine, SAE Technical Paper 2011-24-0059, (2011), doi:10.4271/2011-24-0059
  5. Seo, J., et al., Numerical investigation of the combustion characteristics and wall impingement with dependence on split-injection strategies from a gasoline direct-injection spark ignition engine., Proceedings of the Institution of Mechanical Engineers, part D: Journal of Automobile Engineering, 227 (2013), 11, pp. 1518-1535
  6. Piock, W., et al., Strategies Towards Meeting Future Particulate Matter Emission Requirements in Homogeneous Gasoline Direct Injection Engines, SAE Int. J. Engines, 4 (2011), 1, pp. 1455-1468, doi:10.4271/2011-01-1212
  7. Etheridge, J., et al., Modelling soot formation in a DISI engine, Proceedings of the Combustion Institute, 33 (2011), 2, pp. 3159-3167
  8. Bonatesta, F., et al., Part-load particulate matter from a GDI engine and the connection with combustion characteristics, Applied Energy, 124 (2014), pp. 366-376
  9. Jiao, Q., and Reitz, R.D., Modeling soot emissions from wall films in a direct-injection spark-ignition engine, International Journal of Engine Research, (2014), doi: 10.1177/1468087414562008
  10. Drake, M.C., and Haworth, D.C., Advanced gasoline engine development using optical diagnostic and numerical modeling, Proc. Combust. Inst., 31 (2007), 1, pp. 99-124
  11. Soid, S., and Zainal, Z.A., Spray and combustion characterization for internal combustion engines using optical measuring techniques - a review, Energy, 36 (2011), p. 724-741
  12. Sick, V., 10- Optical diagnostics for direct injection gasoline engine research and development, in Advanced Direct Injection Combustion Engine Technologies and Development, Ed. Zhao H. ISBN: 978-1-84569-389-3, 2010, pp. 260-286
  13. Dahlander, P., and Hemdal, S., High-speed photography of stratified combustion in an optical GDI engine for different triple injection strategies, SAE Technical Paper 2015-01-0745, (2015)
  14. Li, T., et al., An Insight Into Effect of Split Injection on Mixture Formation and Combustion of DI Gasoline Engines, SAE Technical Paper 2004-01-1949, (2004), doi: 10.4271/2004-01-1949
  15. L. Cao, et al., Investigation into Controlled Auto-Ignition Combustion in a GDI Engine with Single and Split Fuel Injections, SAE Technical Paper 2007-01-0211, (2007), doi: 10.4271/2007-01-0211
  16. Fan, Q., et al., Effect of the fuel injection strategy on first-cycle firing and combustion characteristics during cold start in a TSDI gasoline engine, International Journal of Automotive Technology, 13 (2012), 4, pp. 523-531
  17. Wislocki, K., et al., Thermodynamic aspects of combustion in gasoline engines fitted with a multiple fuel injection, Journal of KONES, 18 (2011), pp. 543-553
  18. Serras-Pereira, J., et al., An Analysis of the Combustion Behavior of Ethanol, Butanol, Iso-Octane, Gasoline, and Methane in a Direct-Injection Spark-Ignition Research Engine., Combustion Science and Technology, 185 (2013), 3, pp. 484-513
  19. Parker, J.R., Algorithms for image processing and computer vision, New York, USA: John Wiley & Sons, 2010
  20. Heywood, J.B., Internal combustion engine fundamentals, New York, USA: McGraw-Hill, 1988
  21. Irimescu, A., Comparison of combustion characteristics and heat loss for gasoline and methane fueling of a spark ignition engine, Proc Rom Acad Ser A, 14 (2013), 2, pp. 161-168
  22. McBride, B.J. and Gordon, S., I. Analysis, in Computer program for calculation of complex chemical equilibrium compositions and applications, vol. 1311 NASA Reference Publication, NASA Lewis Research Center, 1994
  23. Rassweiler, G., and Withrow, L., Motion Pictures of Engine Flames Correlated with Pressure Cards, SAE Technical Paper n. 380139, 1938
  24. Irimescu, A., Working Fluid Properties Variation During Combustion in Premixed Charge Hydrogen Engines, SAE Technical Paper 2012-01-1646, (2012), doi:10.4271/2012-01-1646
  25. Costa, M., et al., Study of mixture formation and early flame development in a research GDI (gasoline direct injection) engine through numerical simulation and UV-digital imaging., Energy, 77 (2014), pp. 88-96
  26. Irimescu, A., et al., Evaluation of different methods for combined thermodynamic and optical analysis of combustion in spark ignition engines, Energy Conversion and Management, 87 (2014), pp. 914-927
  27. Serras-Pereira, J., et al., Imaging and heat flux measurements of wall impinging sprays of hydrocarbons and alcohols in a direct-injection spark-ignition engine, Fuel, 91 (2012), pp. 264-297
  28. Merola, et al., UV-visible optical characterization of the early combustion stage in a DISI engine fuelled with butanol-gasoline blend, SAE Tech. Paper 2013-01-2638, (2013), doi: 10.4271/2013-01-2638
  29. Merola, S.S., et al., Effect of the fuel injection strategy on the combustion process in a PFI boosted spark-ignition engine, Energy, 35 (2010), 2, pp. 1094-1100

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence