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Research Papers: Fuel Combustion

Experimental Study of Turbulent Burning Velocity of Premixed Biogas Flame

[+] Author and Article Information
Ahmad Ayache

Department of Mechanical Engineering,
University of Manitoba,
Winnipeg, MB R3T 5V6, Canada

Madjid Birouk

Department of Mechanical Engineering,
University of Manitoba,
Winnipeg, MB R3T 5V6, Canada
e-mail: madjid.birouk@umanitoba.ca

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 11, 2018; final manuscript received August 2, 2018; published online September 14, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 141(3), 032202 (Sep 14, 2018) (8 pages) Paper No: JERT-18-1423; doi: 10.1115/1.4041095 History: Received June 11, 2018; Revised August 02, 2018

Biogas is a renewable source of energy produced by anaerobic digestion of organic material and composed mainly of methane (CH4) and carbon dioxide (CO2). Despite its lower heating value, biogas can still replace fossil fuels in several engineering stationary power generation and other industrial applications. Although numerous published studies were devoted to advance our understating of biogas combustion, experimental data of some parameters such as turbulent burning velocity (St) under certain operating conditions is still lacking. The present study aims to experimentally determine biogas turbulent burning velocity under normal temperature and pressure conditions. Turbulent premixed biogas–air flame was ignited at the center of a 29 L fan-stirred spherical combustion chamber of nearly homogeneous and isotropic turbulence. Test conditions consisted of varying turbulence intensity and biogas surrogate composition. Outwardly propagating biogas flames were tracked and imaged using Schlieren imaging technique. The results showed that, by increasing turbulence and reducing methane percentage in the surrogate, the flammability of the mixture shrinked. In addition, the curve fits of biogas turbulent burning velocity versus the equivalence ratio exhibited two different trends. The peak of turbulent burning velocity shifted away from nearly lean equivalence ratio toward the stoichiometric at a fixed turbulence intensity and higher CH4 percentage in the surrogate. However, for the same biogas surrogate composition, the peak of turbulent burning velocity shifted away from stoichiometric toward leaner equivalence ratio with increased turbulence intensity.

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Figures

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Fig. 1

Schematic of the top-view of the experimental setup

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Fig. 2

Z-type Schlieren imaging technique

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Fig. 3

Variation of turbulent intensity, u′, and the corresponding mean velocities (Umean and Vmean) as a function of the fan rotational speed (rpm)

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Fig. 4

Variation of the isotropic and homogeneity ratio along the radial distance from the center of the chamber at two different fan speeds (rpm)

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Fig. 5

Borghi–Peters diagram of the experimental conditions for 50–70% CH4 biogas

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Fig. 6

Spherically propagating biogas turbulent flames

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Fig. 7

Evolution of Damkohler Number of biogas flame as a function of equivalence ratio

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Fig. 9

Biogas turbulent burning velocity versus equivalence ratio at u' = 0.5 m/s

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Fig. 10

Biogas turbulent burning velocity versus equivalence ratio at u′ = 1.0 m/s

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Fig. 11

Biogas turbulent burning velocity versus equivalence ratio at u′ = 1.5 m/s

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Fig. 12

Biogas turbulent burning velocity versus equivalence ratio for 50% CH4–50% CO2

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Fig. 13

Biogas turbulent burning velocity versus equivalence ratio for 60% CH4–40%CO2

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Fig. 14

Biogas turbulent burning velocity versus equivalence ratio for 70% CH4–30%CO2

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Fig. 8

Temporal variation of Schlieren flame radius of turbulent biogas flames at different turbulent intensities and fuel compositions for ((a)–(c)) 50%CO2–50% CH4, ((c)–(f)) 40%CO2–60% CH4, and ((g)–(i)) 30%CO2–70% CH4

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