Email this article DEPENDENCY OF THE AUTOIGNITION DELAY, COMBUSTION AND EXHAUST EMISSIONS OF A DIESEL ENGINE ON THE CETANE NUMBER OF AVIATION-TURBINE JP-8 FUEL
Abstract
The article presents the bench test results of a fully instrumented, four cylinder, naturally aspirated, (60 kW) DI diesel engine running on the normal (class C) diesel fuel (DF) and aviation-turbine (JP-8) fuel. Analysis of changes in the autoignition delay, maximum in-cylinder pressure, performance efficiency of an engine and exhaust emissions caused by the variation of the cetane number of JP-8 fuel was provided. The series of engine tests were conducted running on the normal JP-8 fuel and JP-8 treated with 0.04vol%, 0.08vol%, 0.12vol%, 0.16vol%, and 0.24vol% of 2-ethylhexyl nitrate. Studies on operating characteristics of an engine were carried out for the fully loaded (100%) engine and the two ranges of speed, - 1400 rpm at which maximum torque occurs and rated 2200 rpm speed.
Adding of 2-ethylhexyl nitrate to aviation-turbine fuel in the above proportions the cetane number (CN) of JP-8 fuel improved from 42.3 to 46.1, 47.6, 48.5, 49.4, and 49.8, respectively, enhancing ignition properties of the fuel to adapt it for using in ground-based military transport. The increase of CN from the reference value of 42.3 to optimum value of 48.5 suggested the brake specific fuel consumption lower 1.4%, both total unburned hydrocarbons (THCs) 7.5% and exhaust smoke 5.7% higher with almost unchangeable the NOx emissions behaviour and 11.9% lower CO emissions when running under a fully (100%) opened throttle at rated 2200 rpm speed. The brake thermal efficiency increased to maximum value of 0.309 (1.3%) for given operating conditions. Analysis of the results revealed that the improved cetane number can be considered as an effective but not the only measure to be applied for an intended use of JP-8 fuel in ground-based diesel engines.
Keyword(s): Diesel engine; JP-8 fuel; CN number; autoignition; combustion; performance; emissions, smoke opacity
References
Church G.J. NATO Logistics Handbook. -SNLC Secretariat International Staff, Defence Policy and Planning Division, Logistics NATO HQ, 1110 Brussels Belgium, 1990, 219 p.
Chong C.T., Hochgreb S. Spray flame structure of rapeseed biodiesel and jet A-1 fuel. Fuel, 2014, Vol. 115, p. 551-558.
Blakey S., Rye L., Wilson C.W. Aviation gas turbine alternative fuels: A Review. Proceedings of the Combustion Institute, 2011, Vol. 33, p. 2863-2885.
Arkoudeas P., Kalligeros S., Zannikos F., Anastopoulos G., Karonis D., Korres D., Lois E. Study of using JP-8 aviation fuel and biodiesel in CI engines. Energ. Convers. Manage., 2003, Vol. 44(7), p. 1013-1025.
Lee J., Oh H., Bae C. Combustion process of JP-8 and fossil diesel fuel in a heavy duty diesel engine using two-color thermometry. Fuel, 2012, Vol. 102, p. 262-273.
Rand Salvatore, Gibbs L., Bonazza B., Furey R. et al. Significance of tests for petroleum products: 8th edition. ASTM international, 2010. ISBN 978-1-61583-673-4, 348 p.
Knothe G., Gerpen J-V., Krohl J. The biodiesel handbook. 2005, Champaign, Illinois, USA: AOCS press, 312 p.
Le Pera M-E. The reality of the single-fuel concept. Army logistician: PB 700-05-2, 2005, 37 p.
Suryanarayanan S., Janakiraman V-M., Sekar J., Lakshmi G., Rao N. Prediction of cetane number of a biodiesel based on physical properties and a study of their influence on cetane number. SAE Paper No 2007-01-0077.
Bezaire N., Wadumesthrige K., Ng K.Y.S., Salley S.O. (2010). Limitations of the use of cetane index for alternative compression ignition engine fuels. Fuel, 2010, Vol. 89, p. 3807-3813.
Lee J., and Bae C. Application of JP-8 in a heavy duty diesel engine. Fuel, 2011, Vol. 90(5), p. 1762-1770.
Myong K., Suzuki H., Senda J., Fujimoto H. Spray inner structure of evaporating multicomponent fuel. Fuel, 2007, Vol. 87(2), p. 202-210.
Pandey A.K., and Nandgaonkar M.R. Performance, Emission and Pump Wear Analysis of JP-8 Fuel for Military Use on a 558 kW, CIDI Diesel Engine. SAE Paper No 2010-01-1518. J. Fuels Lubr. Vol. 3(2), p. 238-245.
Fernandes G., Fuschetto J., Filipi Z., Assanis D., Mckee H. Impact of military JP-8 fuel on heavy-duty diesel engine performance and emissions. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2007, Vol. 221(8), p. 957-970.
Willard W. Pulkrabek (University of Wisconsin – Platteville). Engineering fundamentals of the internal combustion engine, 2009, Vol. 07458. Upper Saddle River, New Jersey: Prentice Hall, 411 p.
Labeckas G., Slavinskas S., Vilutienė V. Combustion, performance and exhaust emissions of the diesel engine operating on jet fuel. Journal of KONES Powertrain and Transport, 2012, Vol. 19(1), p. 227-236.
Labeckas G., Slavinskas S., Vilutienė V. Combustion, performance and emission characteristics of diesel engine operating on jet fuel treated with the cetane improver. Proceedings of 12th International Scientific Conference “Engineering for Rural Development”, Latvia, Jelgava, LUA, 23-24 of May, 2013, Vol. 12, p. 313-318.
Labeckas G., Slavinskas S., Vilutienė V. The effect of the cetane number improving additive on combustion, performance and emissions of a DI diesel engine operating on JP-8 fuel. American Society of Civil Engineers J. Energy Eng., 2014, 10.1061/(ASCE)EY.1943-7897.0000222, 14 p.
Nygren E., Aleklett K., Höök M. Aviation fuel and future oil production scenarios. Energy Policy, 2009, p. 4003-4010.
Schihl P., Hoogterp L., and Pangilinan H. (2006). “Assessment of JP-8 and DF-2 Evaporation Rate and Cetane Number Differences on a Military Diesel Engine”. SAE Paper No 2006-01-1549.
Rakopoulos C.D., Hountalas D.T., Rakopoulos D.C., Levendis Y.A. Comparative Environmental Evaluation of JP-8 and Diesel Fuels Burned in Direct Injection (DI) or Indirect Injection (IDI) Diesel Engines and in a Laboratory Furnace. Energ. and Fuels, 2004, Vol. 18(5), p. 1302-1308.
Papagiannakis R.G., Kotsiopoulos P.N., Hountalas D.T., Yfantis E. Single Fuel Research Program Comparative Results of the Use of JP-8 Aviation Fuel versus Diesel Fuel on a Direct Injection and Indirect injection Diesel Engine. SAE Paper, 2006, No 2006-01-1673.
Kumar K., Sung C-J. An experimental study of the autoignition characteristics of conventional jet fuel/oxidizer mixtures: Jet-A and JP-8. Combust. Flame, 2010a, Vol. 157(1), p. 676-685.
Kumar K., Sung C-J. A comparative experimental study of the autoignition characteristics of alternative and conventional jet fuel/oxidizer mixtures. Fuel, 2010b, Vol. 89(5), p. 2853-2863.
Labeckas G. S. Some of the relationships between basic parameters of the fuel supply apparatus and the fuel injection and atomization characteristics. Republican Interdepartmental Scientific Technical Journal “Internal Combustion Engines. Kharkov, Higher School Publishing, 1987, Vol. 46, p. 52-59 (in Russian).
Graboski M.S., and McCormick, R.L.. Combustion of fat and vegetable oil derived fuels in Diesel engines. Prog. Energ. Combust., Sci., 1998, Vol. 24(2), p. 125-164.
DOI: http://dx.doi.org/10.15544/ageng.2014.003
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