Confined flames are widely used in the industrial field. The flame characteristics can be strongly dominated by the combination of a burner and furnace geometries, which were not paid much attention before. In the present study, flow fields in confined flames are discussed in terms of the flame characteristics. The flow characteristics of confined flames have been investigated for propane nonpremixed flames in cylindrical furnaces. The effects of the inner diameter of the cylindrical furnace D1, the turbulence at the flame boundary, and the global equivalence ratio φ are examined in terms of the relation between the emission of NOx and the flow fields. The emission index of NOx, EINOx, decreases roughly with these parameters. The decrease in EINOx is thought to be related to the dilution of mixtures by the burned gas and the flame stretch. The dilution is attributable to vortices formed at the bottom of the furnace, and the flame stretch is attributable to the air velocity difference ΔUa created by two air nozzles. In the present study, it was found that the increases in D1, ΔUa, and φ enlarge and strengthen recirculation vortices to dilute the flame.
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ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference
July 8–12, 2007
Vancouver, British Columbia, Canada
Conference Sponsors:
- Heat Transfer Division
ISBN:
0-7918-4274-6
PROCEEDINGS PAPER
Effects of Flow Field on Combustion Characteristics of Confined Jet Nonpremixed Flames
Susumu Noda,
Susumu Noda
Toyohashi University of Technology, Toyohashi, Aichi, Japan
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Yuzuru Nada,
Yuzuru Nada
Toyohashi University of Technology, Toyohashi, Aichi, Japan
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I. Gede Parwatha,
I. Gede Parwatha
Toyohashi University of Technology, Toyohashi, Aichi, Japan
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Shingo Fukushige
Shingo Fukushige
Toyohashi University of Technology, Toyohashi, Aichi, Japan
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Susumu Noda
Toyohashi University of Technology, Toyohashi, Aichi, Japan
Yuzuru Nada
Toyohashi University of Technology, Toyohashi, Aichi, Japan
I. Gede Parwatha
Toyohashi University of Technology, Toyohashi, Aichi, Japan
Shingo Fukushige
Toyohashi University of Technology, Toyohashi, Aichi, Japan
Paper No:
HT2007-32638, pp. 579-583; 5 pages
Published Online:
August 24, 2009
Citation
Noda, S, Nada, Y, Parwatha, IG, & Fukushige, S. "Effects of Flow Field on Combustion Characteristics of Confined Jet Nonpremixed Flames." Proceedings of the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 1. Vancouver, British Columbia, Canada. July 8–12, 2007. pp. 579-583. ASME. https://doi.org/10.1115/HT2007-32638
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