Email this article THE EFFECT OF THE BIOFUEL PROPERTIES ON THE AUTOIGNITION DELAY IN A DIESE ENGINE
Abstract
The article presents the test results of a four-stroke, four-cylinder, naturally aspirated, DI 60 kW diesel engine operating on diesel fuel (DF) and its 5 vol% (E5), 10 vol% (E10), and 15 vol% (E15) blends with anhydrous (99.8%) ethanol (E). An additional ethanol–diesel–biodiesel blend E15B was prepared by adding the 15 vol% of ethanol and 5 vol% of biodiesel (B) to diesel fuel (80 vol%). The purpose of the research was to examine the influence of the ethanol and RME addition to diesel fuel on the start of injection and autoignition delay. The widely differing physical and chemical properties of the biofuel blends along with engine load and speed modes were taken into account to provide sound analysis of the experimental test results.
Studies showed that the density of biofuel blends E5, E10, E15 and E15B was 0.33%, 0.65%, 0.95% and 0.56% lower at the temperature of 40 °C than the corresponding value (0.828 kg/m3) of diesel fuel. Kinematic viscosity of biofuel blends E5, E10, E15 and E15B also decreased by 7.8%, 11.0%, 13.0% and 10.8% at the temperature of 40 °C and the cetane number was 3%, 9%, 14% and 12% lower, respectively, compared to commercial diesel fuel. The use of biofuel blends E15 and E15B the autoignition delay increased by 4.4% and 9.5% compared to normal diesel operation at full pe = 0.67 MPa (100%) load and 1400 rpm speed at which maximum torque occurs.
References
Barabás, I.; Todorut, A.; Ldean, D. Performance and emission characteristics of an CI engine fueled with diesel-biodiesel-bioethanol blends. Fuel, 2010, vol. 89, p. 3827–3832.
Çetin, M.; Yüksel, F.; Kuş, H. Emission characteristics of a converted diesel engine using ethanol as fuel. Energy for Sustainable Development, 2009, vol. 13, p. 250–254.
Hulwan, D.B.; Joshi, S.V. Performance, emission and combustion characteristic of a multicylinder DI diesel engine running on diesel–ethanol–biodiesel blends of high ethanol content. Applied Energy, 2011, vol. 88, p. 5042–5055.
European standard. (1994). “Petroleum products-Transparent and opaque liquids-Determination of kinematic viscosity and calculation of dynamic viscosity.” EN ISO 3104+AC: 1994.
European standard. (1998). “Petroleum products-Determination of the ignition quality of diesel fuels-Cetane engine method.” EN ISO 5165:1998.
European standard. (1999a). “Crude petroleum and petroleum products-Determination of density-Oscillating U-tube method.” EN ISO 12185:1999.
Heywood, JB. Internal combustion engine fundamentals. McGrow-Hill International Editions. Printed in Singapore; 1988, p. 930.
Labeckas, G. Biodegalų naudojimas vidaus degimo varikliuose. Biomasės inžinerija, II tomas. Kaunas, 2008. p. 117–192.
Labeckas, G.; Slavinskas, S.; Mažeika, M. The effect of ethanol–diesel–biodiesel blends on combustion, performance and emissions of a direct injection diesel engine. Energy Conversion and Management, 2014, vol. 79, p. 698-720.
Lapuerta, M.; García-Contreras, R.; Agudelo, J.R. Lubricity of ethanol–biodiesel-diesel fuel blends. Energy Fuels, 2010, vol. 24, p. 1374–1382.
LI, D. et al. Physico-chemical properties of ethanol-diesel blend fuel and its effect on performance and emissions of diesel engines. Renewable Energy, 2005, vol. 30, p. 967–976.
Matijošius, J. Dyzelinio variklio ekologinių rodiklių gerinimas naudojant biobutanolio ir biodyzelino mišinius: daktaro disertacija, VGTU 2011.
Pukalskas, S. Etilo spirito įtaka dyzelinio variklio ekonomiškumui ir dūmuotumui: daktaro disertacija. Vilnius: VGTU, 2002.
Qiang F. et al. Effects of ethanol diesel biodiesel blends on combustion and emissions in premixed low temperature combustion. Applied Thermal Engineering, 2013, vol. 54, p. 541–548.
Rakopoulos, C. D.; Antonopoulos, K. A.; Rakopoulos, D. C. Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol-diesel fuel blends. Energy, 2007, vol. 32, p. 1791–1808.
Rakopoulos, D. C. et al. Effects of ethanol-diesel fuel blends on the performance and exhaust emissions of heavy duty DI diesel engine. Energy Conversion and Management, 2008, vol. 49, p. 3155–3162.
Shahir, S.A. et al. Feasibility of diesel–biodiesel–ethanol/bioethanol blend as existing CI engine fuel: An assessment of properties, material compatibility, safety and combustion. Renewable and Sustainable Energy Reviews, 2014, vol. 32, p. 379-395.
Park, S. H. et al. Effect of early injection strategy on spray atomization and emission reduction characteristics in bioethanol blended diesel fueled engine. Energy, 2012, vol. 39, p. 375–387.
Torres-Jimenez, E et al. Physical and chemical properties of ethanol-diesel fuel blends. Fuel, 2011, vol. 90, p. 795–802.
Weber De Menezes, E. et al. Effect of ethers and ether/ethanol additives on the physicochemical properties of diesel fuel and on engine tests. Fuel, 2006, vol. 85, p. 815–822.
Гарипов, М. Д.; Еникеев, Р. Д.; Сакулин, Р. Ю. Рабочие процессы и конструирование двигателей, работающих на биотопливах: учебное пособие. Уфимский государственный авиационный технический университет. Уфа: УГАТУ, 2008. 107 с.
DOI: http://dx.doi.org/10.15544/ageng.2014.005
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