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A Study on the Effects of Cetane Number on the Energy Balance between Differently Sized Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
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This paper investigates the effect of the cetane number (CN) of a diesel fuel on the energy balance between a light duty (1.9L) and medium duty (4.5L) diesel engine. The two engines have a similar stroke to bore (S/B) ratio, and all other control parameters including: geometric compression ratio, cylinder number, stroke, and combustion chamber, have been kept the same, meaning that only the displacement changes between the engine platforms. Two Coordinating Research Council (CRC) diesel fuels for advanced combustion engines (FACE) were studied. The two fuels were selected to have a similar distillation profile and aromatic content, but varying CN. The effects on the energy balance of the engines were considered at two operating conditions; a “low load” condition of 1500 rev/min (RPM) and nominally 1.88 bar brake mean effective pressure (BMEP), and a “medium load” condition of 1500 RPM and 5.65 BMEP. Results were recorded at the same crank angle 50% burn (CA50) condition to decouple fuel effects from engine effects. The results show that the CN of the fuel impacts the distribution of supplied fuel energy in both engine systems. At the low load condition, a decrease in the fractional cylinder heat transfer is seen for the medium duty engine as CN increases. In general, the sensitivity of the engines to CN is found to increase as engine load increases. At the medium load condition, the observed differences in the fractional heat transfer are larger, and this is especially true for the medium duty engine. This in turn balances the tradeoff between the changes in mixture temperatures and combustion durations. Moreover, as the CN increases, the energy lost to the exhaust increases for both engines at the medium load condition. This is in contrast to the low load condition, where increasing the CN increases the energy in the exhaust of the medium duty engine, but decreases the energy in the exhaust of the light duty engine. Finally, at the low load condition, a higher CN consistently increases the brake fuel efficiency of both engines. This is in contrast, to the medium load condition, where increasing the CN of the fuel increases the brake fuel efficiency of the light duty engine, but causes a slight decrease in the brake fuel efficiency of the medium duty engine.
CitationLi, J., Bera, T., Parkes, M., and Jacobs, T., "A Study on the Effects of Cetane Number on the Energy Balance between Differently Sized Engines," SAE Technical Paper 2017-01-0805, 2017, https://doi.org/10.4271/2017-01-0805.
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- Organisation, B., CEN. EN 590:2009 - automotive fuels - diesel - requirements and test methods. 2009.
- International, A., Specification for Diesel Fuel Oils, 2009, ASTM International: West Conshohocken, PA.
- Busch, S., Bohac S.V., and Assanis D.N., A study of the transition between lean conventional diesel combustion and lean, premixed, low-temperature diesel combustion. Journal of Engineering for Gas Turbines and Power-Transactions of the Asme, 2008. 130(5): p. -.
- Heywood, J.B., Internal Combustion Engine Fundamentals 1988: McGraw-Hill, Inc.
- Risberg, P., Kalghatgi, G., Ångstrom, H., and Wåhlin, F., "Auto-ignition quality of Diesel-like fuels in HCCI engines," SAE Technical Paper 2005-01-2127, 2005, doi:10.4271/2005-01-2127.
- Szybist, J. and Bunting, B., "Cetane Number and Engine Speed Effects on Diesel HCCI Performance and Emissions," SAE Technical Paper 2005-01-3723, 2005, doi:10.4271/2005-01-3723.
- Bunting, B.G., et al., Fuel chemistry and cetane effects on diesel homogeneous charge compression ignition performance, combustion, and emissions. International Journal of Engine Research, 2007. 8(1): p. 15-27.
- Ajav, E.A., Singh B., and Bhattacharya T.K., Thermal balance of a single cylinder diesel engine operating on alternative fuels. Energy Conversion and Management, 2000. 41(14): p. 1533-1541.
- Moran, M.J., et al., Fundamentals of Engineering Thermodynamics 2010: Wiley.
- Abedin, M.J., et al., Energy balance of internal combustion engines using alternative fuels. Renewable and Sustainable Energy Reviews, 2013. 26: p. 20-33.
- Yüksel, F. and Ceviz M.A., Thermal balance of a four stroke SI engine operating on hydrogen as a supplementary fuel. Energy, 2003. 28(11): p. 1069-1080.
- Taymaz, I., An experimental study of energy balance in low heat rejection diesel engine. Energy, 2006. 31(2-3): p. 364-371.
- Durgun, O. and Şahin Z., Theoretical investigation of heat balance in direct injection (DI) diesel engines for neat diesel fuel and gasoline fumigation. Energy Conversion and Management, 2009. 50(1): p. 43-51.
- Yildirim, D. and Ozgener L., Thermodynamics and exergoeconomic analysis of geothermal power plants. Renewable and Sustainable Energy Reviews, 2012. 16(8): p. 6438-6454.
- Özcan, H. and Söylemez M.S., Thermal balance of a LPG fuelled, four stroke SI engine with water addition. Energy Conversion and Management, 2006. 47(5): p. 570-581.
- Martyr, A.J. and Plint M.A., 16 - Exhaust emissions, in Engine Testing (Third Edition) 2007, Butterworth-Heinemann: Oxford. p. 324-353.
- Dimopoulos, P., et al., Increase of passenger car engine efficiency with low engine-out emissions using hydrogen-natural gas mixtures: A thermodynamic analysis. International Journal of Hydrogen Energy, 2007. 32(14): p. 3073-3083.
- Dimopoulos, P., et al., Hydrogen-natural gas blends fuelling passenger car engines: Combustion, emissions and well-to-wheels assessment. International Journal of Hydrogen Energy, 2008. 33(23): p. 7224-7236.
- Annand, W.J.D., A.M. B.Sc., and Lecturer S., Heat Transfer in the Cylinders of Reciprocating Internal Combustion Engines. THERMODYNAMICS AND FLUID MECHANICS GROUP 1962(University of ManChester): p. 973-996.
- Woschni, G., "A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine," SAE Technical Paper 670931, 1967, doi:10.4271/670931.
- Hohenberg, G., "Advanced Approaches for Heat Transfer Calculations," SAE Technical Paper 790825, 1979, doi:10.4271/790825.
- Incropera, F.P., et al., Fundamentals of heat and mass transfer 2011: Wiley.
- Bittle, J., Knight, B., and Jacobs, T., "Heat Release Parameters to Assess Low Temperature Combustion Attainment," SAE Technical Paper 2011-01-1350, 2011, doi:10.4271/2011-01-1350.
- Brunt, M. and Platts, K., "Calculation of Heat Release in Direct Injection Diesel Engines," SAE Technical Paper 1999-01-0187, 1999, doi:10.4271/1999-01-0187.
- Krieger, R., Borman, G., The computation of apparent heat release for internal combustion engines. ASME Papers, 1966. 66-WA/DGP-P.
- COORDINATING RESEARCH COUNCIL, I., CHEMICAL AND PHYSICAL PROPERTIES OF THE FUELS FOR ADVANCED COMBUSTION ENGINES (FACE) RESEARCH DIESEL FUELS. July 2010: p. 242.
- Gallant, T., Franz, J., Alnajjar, M., Storey, J. et al., "Fuels for Advanced Combustion Engines Research Diesel Fuels: Analysis of Physical and Chemical Properties," SAE Int. J. Fuels Lubr. 2(2):262-272, 2010, doi:10.4271/2009-01-2769.
- Penny, M.A. and Jacobs T.J., Efficiency improvements with low heat rejection concepts applied to diesel low temperature combustion. International Journal of Engine Research, 2015.