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Research Papers: Fuel Combustion

Laminar Flame Characteristics of Partially Premixed Prevaporized Palm Methyl Ester and Diesel Flames

[+] Author and Article Information
D. Romero, R. N. Parthasarathy, S. R. Gollahalli

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

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 11, 2013; final manuscript received March 14, 2014; published online May 13, 2014. Assoc. Editor: Kevin M. Lyons.

J. Energy Resour. Technol 136(3), 032204 (May 13, 2014) (11 pages) Paper No: JERT-13-1338; doi: 10.1115/1.4027406 History: Received December 11, 2013; Revised March 14, 2014

Palm methyl ester (PME) is a renewable biofuel that is produced by the transesterification of palm oil and is a popular alternative fuel used in the transportation sector, particularly in Asia. The objective of this investigation was to study the combustion characteristics of flames of prevaporized number 2 diesel and PME in a laminar flame environment at initial equivalence ratios of 2, 3, and 7 and to isolate the factors attributable to chemical structure of the fuel. The equivalence ratio was changed by altering the fuel flow rate, while maintaining the air flow rate constant. The global CO emission index of the PME flames was significantly lower than that of the diesel flames; however, the global NO emission index was comparable. The radiative fraction of heat release and the soot volume fraction were lower for the PME flames compared to those in the diesel flames. The peak temperatures were comparable in both flames at an equivalence ratio of 2, but at higher equivalence ratios, the peak temperatures in the PME flames were higher. The measurements highlight the differences in the combustion properties of biofuels and petroleum fuels and the coupling effects of equivalence ratio.

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Copyright © 2014 by ASME
Topics: Diesel , Flames , Soot , Emissions , Fuels
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Figures

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Fig. 2

Schematic diagram of the soot volume fraction measurement setup

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Fig. 1

Details of the experimental setup

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Fig. 3

(a) Photographs of diesel and PME flames at Φ = 2; color photographs are presented in Ref. [15]. (b) Photographs of diesel and PME flames at Φ = 3; color photographs are presented in Ref. [15]. (c) Photographs of diesel and PME flames at Φ = 7; color photographs are presented in Ref. [15].

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Fig. 4

(a) CO emission index of diesel and PME flames (Φ = 2, 3). (b) CO emission index of diesel and PME flames (Φ = 7).

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Fig. 5

NO emission index of diesel and PME flames

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Fig. 6

Radiative heat release fraction of diesel and PME flames

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Fig. 7

(a) Temperature profiles in diesel (left) and PME (right) flames, Φ = 2. (b) Temperature profiles in diesel (left) and PME (right) flames, Φ = 3. (c) Temperature profiles in diesel (left) and PME (right) flames, Φ = 7.

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Fig. 8

(a) Oxygen concentration profiles in diesel (left) and PME (right) flames, Φ = 2. (b) Oxygen concentration profiles in diesel (left) and PME (right) flames, Φ = 3. (c) Oxygen concentration profiles in diesel (left) and PME (right) flames, Φ = 7.

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Fig. 9

(a) CO2 concentration profiles in diesel (left) and PME (right) flames, Φ = 2. (b) CO2 concentration profiles in diesel (left) and PME (right) flames, Φ = 3. (c) CO2 concentration profiles in diesel (left) and PME (right) flames, Φ = 7.

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Fig. 10

(a) CO concentration profiles in diesel (left) and PME (right) flames, Φ = 2. (b) CO concentration profiles in diesel (left) and PME (right) flames, Φ = 3. (c) CO concentration profiles in diesel (left) and PME (right) flames, Φ = 7.

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Fig. 11

(a) NO concentration profiles in diesel (left) and PME (right) flames, Φ = 2. (b) NO concentration profiles in diesel (left) and PME (right) flames, Φ = 3. (c) NO concentration profiles in diesel (left) and PME (right) flames, Φ = 2.

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Fig. 12

Axial soot volume concentration profiles in diesel (left) and PME (right) flames

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