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Research Papers: Internal Combustion Engines

An Experimental Investigation of Low-Octane Gasoline in Diesel Engines

[+] Author and Article Information
Stephen Ciatti, Swami Nathan Subramanian

 Argonne National Laboratory, Argonne, IL 60439

J. Eng. Gas Turbines Power 133(9), 092802 (Apr 15, 2011) (11 pages) doi:10.1115/1.4002915 History: Received September 27, 2010; Revised October 12, 2010; Published April 15, 2011; Online April 15, 2011

Conventional combustion techniques struggle to meet the current emissions norms. In particular, oxides of nitrogen (NOx) and particulate matter (PM) emissions have limited the utilization of diesel fuel in compression ignition engines. Advance combustion concepts have proved the potential to combine fuel efficiency and improved emission performance. Low-temperature combustion (LTC) offers reduced NOx and PM emissions with comparable modern diesel engine efficiencies. The ability of premixed, low-temperature compression ignition to deliver low PM and NOx emissions is dependent on achieving optimal combustion phasing. Diesel operated LTC is limited by early knocking combustion, whereas conventional gasoline operated LTC is limited by misfiring. So the concept of using an unconventional fuel with the properties in between those two boundary fuels has been experimented in this paper. Low-octane (84 RON) gasoline has shown comparable diesel efficiencies with the lowest NOx emissions at reasonable high power densities (NOx emission was 1g/kWh at 12 bar BMEP and 2750 rpm).

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Experimental setup

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Figure 2

Effect on BSFC and BSNOx emissions

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Figure 3

Comparison of engine out NOx emissions

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Figure 4

Comparison of engine out HC emissions

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Figure 5

Comparison of engine out CO emissions

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Figure 6

Comparison of engine exhaust gas temperatures

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Figure 7

Specific NOx versus BMEP for different combustion strategies

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Figure 8

Specific HC versus BMEP for different combustion strategies

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Figure 9

Specific CO emissions versus BMEP for different combustion strategies

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Figure 10

Heat release rate and injection profiles at 2 bar BMEP

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Figure 11

Heat release rate and injection profiles at 5 bar BMEP

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Figure 12

Heat release rate and injection profiles at 8 bar BMEP

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Figure 13

Heat release rate and injection profiles at 12 bar BMEP

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Figure 14

Comparison of in-cylinder gas pressure for gasoline (LTC) and diesel

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Figure 15

Effect of parameters on NOx emissions

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Figure 16

Effect of parameters on HC emissions

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Figure 17

Effect of parameters on CO emissions

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Figure 18

Effect of parameters on SFC

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Figure 19

Effect of parameters on combustion noise

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Figure 20

Effect of parameters on COV of IMEP

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