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Research Papers: Fuel Combustion

An Experimental Study of Optimum Angle of Air Swirler Vanes in Liquid Fuel Burners

[+] Author and Article Information
S. H. Pourhoseini

Department of Mechanical Engineering,
Faculty of Engineering,
University of Gonabad,
Gonabad 9691644915, Iran
e-mail: hadipoorhoseini@gmail.com

Rasoul Asadi

Department of Mechanical Engineering,
Faculty of Engineering,
University of Gonabad,
Gonabad 9691644915, Iran

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 27, 2016; final manuscript received October 9, 2016; published online November 10, 2016. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 139(3), 032202 (Nov 10, 2016) (5 pages) Paper No: JERT-16-1147; doi: 10.1115/1.4035023 History: Received March 27, 2016; Revised October 09, 2016

The present work shows that how the angle of an air swirler vane affects the combustion characteristics of liquid fuels such as flame temperature, radiation heat flux, combustion efficiency, and pollutants' emission. It finds out an optimum angle of vane based on flame characteristics. Three vanes with angles of 0 deg, 40 deg, and 80 deg which induced low and high-swirl intensities in air stream were investigated, and the combustion characteristics of flame were quantified. The flame temperature was measured by an S-type thermocouple, and a Testo 350 XL gas analyzer was used to determine the CO and NO pollutant concentrations. Also, gravity method was used to gauge the soot concentration along the furnace, and a SBG01 water cooled heat flux sensor determined the flame radiation. The results indicate that the angle of the swirler vane has significant effects on temperature, combustion efficiency, and NO and CO pollutants' emission. Most importantly, there is an optimum angle for the swirler vane. At the optimum angle, the optimum combination of the contact area and time maximizes the mixing rate of the inlet air and the fuel jet. Consequently, at the optimum angle, the mean temperature, radiation heat flux, and combustion efficiency are higher than at small and large swirl angles and soot, CO and NOx emissions are at their minimum states.

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Figures

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Fig. 1

The schematic of laboratory cylindrical furnace and swirler vane

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Fig. 2

Effect of swirler vane angles on axial flame temperature

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Fig. 3

Effect of swirler vane angles on combustion efficiency

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Fig. 4

Effect of swirler vane angles on flame radiation heat transfer

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Fig. 5

Effect of swirler vane angles on soot formation rate

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Fig. 6

Effect of swirler vane angles on CO pollutant concentration

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Fig. 7

Effect of swirler vane angles on NO pollutant concentration

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Fig. 8

Effect of swirler vane angles on NOx emission

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