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Research Papers

Combustion Characteristics of Biofuels in Porous-Media Burners at an Equivalence Ratio of 0.8

[+] Author and Article Information
Pablo E. Barajas, R. N. Parthasarathy

 School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019

S. R. Gollahalli1

 School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019gollahal@ou.edu

1

Corresponding author.

J. Energy Resour. Technol 134(2), 021004 (Apr 04, 2012) (5 pages) doi:10.1115/1.4006046 History: Received July 08, 2011; Revised January 19, 2012; Published April 02, 2012; Online April 04, 2012

Biofuels, such as canola methyl ester (CME) and soy-methyl ester (SME) derived from vegetable oil, are alternative sources of energy that have been developed to reduce the dependence on petroleum-based fuels. In the present study, CME, SME, and commercial Jet-A fuel were tested in a porous-media burner at an equivalence ratio of 0.8 at the burner entrance. The measured combustion characteristics included NOx and CO emission indices, radiative fraction of heat release, and axial temperature profile in the surface stabilized and extended flame. The effects of fuel on the injector and porous-media durability were also documented. The NOx emission index was higher for the SME and CME flames than that of the Jet-A flame. Furthermore, the axial temperature profiles were similar for all the flames. The prolonged use of CME and SME resulted in more solid-particle deposition on the interior walls of the injector and within the structure of the porous medium than for Jet-A fuel, thereby increasing the restriction to the fuel/air flow and pressure drop across the burner.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of the combustion chamber

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Figure 2

Photograph of porous media used in the burner: evaporation porous medium (left), combustion porous medium (right)

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Figure 3

Photographs of CME, SME, and Jet-A flames

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Figure 4

Radiative fraction of heat release measured for SME, CME, and Jet-A flames

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Figure 5

Axial temperature profiles of SME, CME, and Jet-A flames

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Figure 6

Comparison of NOx emission index of SME, CME, and Jet-A flames

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Figure 7

Comparison of CO emission index of SME, CME, and Jet-A flames

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Figure 8

Comparison of pressure drops across new and used evaporation porous medium

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Figure 9

Comparison of pressure drops across new and used combustion porous medium

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