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Research Papers: Fuel Combustion

Measurements of Laminar Flame Speeds of Gas-to-Liquid-Diesel Fuel Blends

[+] Author and Article Information
Samahat Samim, Abdellatif M. Sadeq

Thermofluids Group,
Mechanical and Industrial
Engineering Department,
College of Engineering,
Qatar University,
P.O. Box 2713,
Doha 2713, Qatar
e-mail: a.mohamed@qu.edu.qa

Samer F. Ahmed

Thermofluids Group,
Mechanical and Industrial
Engineering Department,
College of Engineering,
Qatar University,
P.O. Box 2713,
Doha 2713, Qatar
e-mail: sahmed@qu.edu.qa

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 10, 2016; final manuscript received May 8, 2016; published online June 14, 2016. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 138(5), 052213 (Jun 14, 2016) (8 pages) Paper No: JERT-16-1166; doi: 10.1115/1.4033627 History: Received April 10, 2016; Revised May 08, 2016

This work investigates the laminar flame speed, SN, of gas-to-liquid (GTL) fuel and its 50–50% by volume blends with conventional diesel, in a cylindrical bomb capable of measuring SN at different initial temperatures and equivalence ratios at ambient pressure. SN was measured by analysing the pressure signals after combustion detected by a pressure transducer mounted on the bomb. Direct visualization has also been conducted to observe the ignition and flame propagation. It was found that pure GTL fuel has the highest SN near stoichiometric conditions, which is about 88.3 cm/s. However, at lean and rich mixtures, SN of GTL is slightly lower than that of the conventional diesel. The blended fuel has the lowest SN at lean and rich mixture conditions comparing with those of GTL and diesel fuels. Studying the effect of increasing the initial temperature on SN revealed that SN of the three tested fuels increases with the increase in the initial temperature almost linearly. However, the blended fuel has the lowest SN at the highest temperature, about 89.7 cm/s at 250 °C.

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Figures

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Fig. 1

Schematic diagram of the cylindrical bomb test rig

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Fig. 2

Temperature profile inside the bomb versus time

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Fig. 3

Visualization of ignition and flame propagation of GTL fuel–air mixture at ϕ = 1 and Ti = 180 °C. Time difference between images is 33 ms.

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Fig. 4

Smooth pressure raise signal versus time of diesel ignition at Ti = 190 °C and ϕ = 1

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Fig. 5

A comparison of SN of a diesel fuel between the present work and those of Ref. [41] at Ti = 190 °C and Pi = 1 atm

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Fig. 6

SN of GTL, conventional diesel, and 50–50 blend as a function of ϕ. Ti = 190 °C. Dashed lines show polynomial fits of these curves.

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Fig. 7

Effect of changing the initial temperature on the SN of GTL, diesel and 50–50 blend at ϕ = 1.0

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