THERMAL SCIENCE

International Scientific Journal

EXPERIMENTAL AND THEORETICAL STUDY ON SPRAY BEHAVIORS OF MODIFIED BIO-ETHANOL FUEL EMPLOYING DIRECT INJECTION SYSTEM

ABSTRACT
One of the key solutions to improve engine performance and reduce exhaust emissions of internal combustion engines is direct injection of bio-fuels. A new modified bio-ethanol is produced to be substituted by fossil fuels in gasoline direct injection engines. The key advantages of modified bio-ethanol fuel as an alternative fuel are higher octane number and oxygen content, a long-chain hydro-carbon fuel, and lower emissions compared to fossil fuels. In the present study spray properties of a modified bio-ethanol and its atomization behaviors have been studied experimentally and theoretically. Based on atomization physics of droplets dimensional analysis has been performed to develop a new non-dimensional number namely atomization index. This number determines the atomization level of the spray. Applying quasi-steady jet theory, air entrainment and fuel-air mixing studies have been performed. The spray atomization behaviors such as atomization index number, Ohnesorge number, and Sauter mean diameter have been investigated employing atomization model. The influences of injection and ambient conditions on spray properties of different blends of modified bio-ethanol and gasoline fuels have been investigated performing high-speed visualization technique. Results indicate that decreasing the difference of injection and ambient pressures increases spray cone angle and projected area, and decreases spray tip penetration length. As expected, increasing injection pressure improves atomization behaviors of the spray. Increasing percentage of modified bio-ethanol in the blend, increases spray tip penetration and decreases the projected area as well.
KEYWORDS
PAPER SUBMITTED: 2016-01-08
PAPER REVISED: 2016-07-13
PAPER ACCEPTED: 2016-10-15
PUBLISHED ONLINE: 2016-11-06
DOI REFERENCE: https://doi.org/10.2298/TSCI160108253G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE 1, PAGES [475 - 488]
REFERENCES
  1. Wu, Z., et al., An experimental study on the spray structure of oxygenated fuel using laser-based visualization and particle image velocimetry, Fuel, 85 (2006), 10, pp. 1458-1464.
  2. Martin, D., et al., Investigation of the influence of multiple gasoline direct injections on macroscopic spray quantities at different boundary conditions by means of visualization techniques, International Journal of Engine Research, 11 (2010), 6, pp. 439-454.
  3. Agarwal, A.K., et al., Comparative study of macroscopic spray parameters and fuel atomization behavior of straight vegetable oils (jatropha), its biodiesel and blends, Thermal Science, 17 (2013), 1, pp. 217-232.
  4. Liu, Y., et al., A study of spray development and combustion propagation processes of spark-ignited direct injection (SIDI) compressed natural gas (CNG), Mathematical and computer modelling, 57 (2013), 1, pp. 228-244.
  5. Kumar, G., Kumar, A., Spray Behavior Comparison in Diesel Engine with Biodiesel as Fuel, Journal of Energy Technologies and Policy, 3 (2013), 4, pp. 14-24.
  6. Hiroyasu, H., Arai, M., Fuel spray penetration and spray angle in diesel engines, Trans. JSAE, 21 (1980), 5, pp. 11.
  7. Pan, J., et al., Spray and combustion visualization of bio-diesel in a direct injection diesel engine, Thermal Science, 17 (2013), 1, pp. 279-289.
  8. Kim, K., et al., Spray and combustion characteristics of gasoline and diesel in a direct injection compression ignition engine, Fuel, 109 (2013), pp. 616-626.
  9. Lee, S., Park, S., Experimental study on spray break-up and atomization processes from GDI injector using high injection pressure up to 30MPa, International Journal of Heat and Fluid Flow, 45 (2014), pp. 14-22.
  10. Wu, Z., et al., Experimental study on spray combustion characteristics of gasoline-diesel blended fuel in a controllable active thermo-atmosphere, Fuel, (2014), pp.
  11. Kim, Y., et al., Effects of ethanol added fuel on exhaust emissions and combustion in a PCCI diesel engine, Thermal Science, (2015), 00, pp. 120-120.
  12. Wei, H., et al., Experimental analysis on spray development of 2-methylfuran-gasoline blends using multi-hole DI injector, Fuel, 164 (2016), pp. 245-253.
  13. Sharma, N., Agarwal, A.K., An Experimental Study of Microscopic Spray Characteristics of a GDI Injector Using Phase Doppler Interferometry, in, SAE Technical Paper, 2016.
  14. Ghahremani, A.R., et al., Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system, Scientia Iranica. Transaction B, Mechanical Engineering, (in press), pp.
  15. Chitsaz, I., et al., Semi analytical solution to transient start of weakly underexpanded turbulent jet, Journal of Fluids Engineering, 133 (2011), 9, pp. 091204.
  16. Chitsaz, I., et al., Experimental and numerical investigation on the jet characteristics of spark ignition direct injection gaseous injector, Applied Energy, 105 (2013), pp. 8-16.
  17. Kean, L., A contribution to the theory of Schlieren sensitivity and quantiative evaluation, in, DTIC Document, 1962.
  18. Mohammadi, M., et al., Experimental Investigation of Thermal Resistance of a Ferrofluidic Closed-Loop Pulsating Heat Pipe, Heat Transfer Engineering, 35 (2014), 1, pp. 25-33.
  19. Park, S.H., et al., A study on the fuel injection and atomization characteristics of soybean oil methyl ester (SME), International Journal of Heat and Fluid Flow, 30 (2009), 1, pp. 108-116.
  20. Roisman, I.V., et al., Effect of ambient pressure on penetration 1 of a diesel spray, International journal of multiphase flow, 33 (2007), 8, pp. 904-920.
  21. Sazhin, S., et al., Jet and vortex ring-like structures in internal combustion engines: stability analysis and analytical solutions, Procedia IUTAM, 8 (2013), pp. 196-204.
  22. Naber, J.D., Siebers, D.L., Effects of gas density and vaporization on penetration and dispersion of diesel sprays, in, SAE technical paper, 1996.
  23. Desantes, J., et al., Development and validation of a theoretical model for diesel spray penetration, Fuel, 85 (2006), 7, pp. 910-917.
  24. Zhang, W., et al., An experimental study on flat-wall-impinging spray of microhole nozzles under ultra-high injection pressures, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 222 (2008), 9, pp. 1731-1741.
  25. Wang, X., et al., Experimental and analytical study on biodiesel and diesel spray characteristics under ultra-high injection pressure, International journal of heat and fluid flow, 31 (2010), 4, pp. 659-666.
  26. Ashgriz, N., Handbook of atomization and sprays: theory and applications, Springer Science & Business Media, 2011.
  27. Ejim, C., et al., Analytical study for atomization of biodiesels and their blends in a typical injector: surface tension and viscosity effects, Fuel, 86 (2007), 10, pp. 1534-1544. 19

© 2017 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