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Research Papers: Internal Combustion Engines

Combustion Phasing Effect on Cycle Efficiency of a Diesel Engine Using Advanced Gasoline Fumigation

[+] Author and Article Information
Bin Huang

Department of Mechanical Engineering,
University of Minnesota,
Minneapolis, MN 55455

1Corresponding author.

Contributed by the IC Engine Division of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received August 13, 2012; final manuscript received August 14, 2012; published online February 21, 2013. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 135(3), 032801 (Feb 21, 2013) (6 pages) Paper No: GTP-12-1330; doi: 10.1115/1.4007757 History: Received August 13, 2012; Revised August 14, 2012

Advanced premixed compression ignition (CI) combustion using fumigation has been shown to yield significant improvements in indicated efficiency over traditional diesel combustion strategies while simultaneously reducing engine-out soot and NOx emissions. To better interpret these findings, a breakdown of the ways in which actual performance deviates from ideal engine cycles is helpful. Nonideal combustion phasing is one cause of such deviations. In this paper, the centroid of the calculated apparent heat release rate is used to estimate an adjusted maximum possible thermal efficiency based on constant volume combustion using an effective compression ratio concept. Using these metrics, experimental engine data are evaluated from a single cylinder direct-injection diesel engine operating in premixed CI mode enabled by gasoline fumigation and a diesel pilot injection. Indicated gross cycle efficiency was found to be higher for premixed fumigation compared with a conventional diesel condition at the same load. A key finding of the work is that the peak indicated cycle efficiency for fumigated premixed CI combustion occurs with combustion phased very close to top dead center. Shorter heat release duration and lower heat losses from the cylinder are thought to be the cause of differences in cycle efficiency between conventional combustion and premixed CI fumigation modes.

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References

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Figures

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Fig. 1

Plot of ideal closed Otto cycle with constant volume combustion occurring at TDC, 10 deg BTDC and 10 deg ATDC

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Fig. 2

Centroid of heat release versus diesel injection timing for F-1 and F-2 operating conditions

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Fig. 3

Cylinder pressure and gross apparent rate of heat release for F-1 and D-1 operating conditions at 20 deg BTDC commanded diesel injection timing

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Fig. 4

Gross apparent rate of heat release for F-1 and F-2 operating conditions at 20, 40 and 60 deg BTDC commanded injection timing

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Fig. 5

Gross indicated specific NOx and soot for F-1 and F-2 operating conditions

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Fig. 6

Gross indicated cycle efficiency versus diesel injection timing for F-1, F-2 and D-1 operating conditions

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Fig. 7

Gross indicated cycle efficiency versus the centroid of heat release for the F-1 and D-1 operating conditions

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Fig. 8

Gross indicated cycle efficiency versus effective compression ratio for F-1, F-2 and D-1 operating conditions showing peak Otto cycle efficiency with constant γ = 1.3

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