In an effort to understand the effects of injection system pressure on alternative fuel performance, a single-cylinder diesel engine was outfit with a modern common rail fuel injection system and piezoelectric injector. As future new fuels will likely be used in both older mechanical injected engines as well as newer high pressure common rail engines, the question as to the sensitivity of a new fuel type across a range of engines is of concern. In this study, conventional diesel fuel (Navy NATO F76) was compared with the new Navy hydroprocessed renewable diesel (HRD) fuel from algal sources, as well as the high cetane reference fuel nC16 (n-hexadecane CN = 100). It was seen that, in general, ignition delay (IGD) was shortened for all fuels with increasing fuel injection pressure and was shortened with higher CN fuels. The combustion duration for all fuels was also significantly reduced with increasing fuel injection pressure, however, longer durations were seen for higher CN fuels at the same fuel pressure due to less premixing before the start of combustion. Companion modeling using the Lawrence Livermore National Lab (LLNL) heavy hydrocarbon and diesel primary reference fuel (PRF) chemical kinetic mechanisms for HRD and nC16 was applied to understand the relative importance of the physical and chemical delay periods of the IGD. It was seen that at low fuel injection pressures, the physical and chemical delay times are of comparable duration. However, as injection pressure increases the importance of the chemical delay times increases significantly (longer), especially with the lower CN fuel.
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October 2015
Research-Article
The Effects of Fuel Injection Pressure and Fuel Type on the Combustion Characteristics of a Diesel Engine
Jim Cowart,
Jim Cowart
U.S. Naval Academy
,Annapolis, MD 21402
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Dianne Luning Prak,
Dianne Luning Prak
U.S. Naval Academy
,Annapolis, MD 21402
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Len Hamilton
Len Hamilton
U.S. Naval Academy
,Annapolis, MD 21402
Search for other works by this author on:
Jim Cowart
U.S. Naval Academy
,Annapolis, MD 21402
Dianne Luning Prak
U.S. Naval Academy
,Annapolis, MD 21402
Len Hamilton
U.S. Naval Academy
,Annapolis, MD 21402
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 28, 2015; final manuscript received March 1, 2015; published online March 31, 2015. Editor: David Wisler.
This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.
J. Eng. Gas Turbines Power. Oct 2015, 137(10): 101501 (9 pages)
Published Online: October 1, 2015
Article history
Received:
February 28, 2015
Revision Received:
March 1, 2015
Online:
March 31, 2015
Citation
Cowart, J., Luning Prak, D., and Hamilton, L. (October 1, 2015). "The Effects of Fuel Injection Pressure and Fuel Type on the Combustion Characteristics of a Diesel Engine." ASME. J. Eng. Gas Turbines Power. October 2015; 137(10): 101501. https://doi.org/10.1115/1.4029949
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