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Research Papers: Fuel Combustion

Effect of Swirl Number on Combustion Characteristics in a Natural Gas Diffusion Flame

[+] Author and Article Information
İlker Yılmaz

Department of Airframe and Powerplant,
College of Aviation,
Erciyes University,
Kayseri 38039, Turkey
e-mail: iyilmaz@erciyes.edu.tr

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received December 21, 2012; final manuscript received April 15, 2013; published online June 24, 2013. Assoc. Editor: Kevin M. Lyons.

J. Energy Resour. Technol 135(4), 042204 (Jun 24, 2013) (8 pages) Paper No: JERT-12-1294; doi: 10.1115/1.4024222 History: Received December 21, 2012; Revised April 15, 2013

This paper presents the effect of swirl number on combustion characteristics such as temperature, velocity, gas concentrations in a natural gas diffusion flame. Numerial simulations carried out using the commercial computational fluid dynamics (CFD) code, Fluent by choosing appropriate model parameters. The combustion reaction scheme in the flame region was modeled using eddy dissipation model with one step global reaction scheme. A standard k-ε turbulence model for turbulent closure and P-I radiation model for flame radiation inside the combustor is used in the numerical simulations. In order to investigate the swirling effect on the combustion characteristics, seven different swirl numbers including 0; 0.1; 0.2; 0.3; 0.4; 0.5; and 0.6 are used in the study. Numerical results are validated and compared with the published experimental and simulation results. A good consistency is found between the present results and those published measurement and simulation results in the available literature. The results shown that the combustion characteristics such as the flame temperature, the gas concentrations including CO2, H2O, O2, and CH4 are strongly affected by the swirl number. Depending on the degree of swirl, the fluid dynamics behavior of natural gas diffusion flame including axial velocity distribution, central recirculation zone (CTRZ) and external recirculation zone (ETRZ) were also strongly affected.

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Figures

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Fig. 1

The physical domain of the combustor

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Fig. 2

Comparison of grid indepency solutions: (a) axial temperature and (b) radial temperature at x = 0.04 m.

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Fig. 3

Comparison of axial and radial temperatures: (a) x = 0, (b) x = 0.04 m, (c) x = 0.10 m, (d) x = 0.20 m, and (e) x = 0.40 m

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Fig. 4

Axial velocity gradients along combustor axis at different swirl numbers

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Fig. 5

Stream lines contours at different swirl numbers: (a) s = 0, (b) s = 0.1, (c) s = 0.2, (d) s = 0.3, (e) s = 0.4, (f) s = 0.5, and (g) s = 0.6

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Fig. 6

Temperature gradients along combustor axis at different swirl numbers

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Fig. 7

Radial temperature gradients at different swirl numbers: (a) x = 0.04 m, (b) x = 0.20 m, and (c) the exit plane of the combustor

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Fig. 8

Gas concentration gradients for different swirl numbers: (a) CH4, (b) CO2, (c) O2, and (d) H2O

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