Title

Effects of dilution on blowout limits of turbulent jet flames

Authors

Authors

Y. C. Chao; C. Y. Wu; K. Y. Lee; Y. H. Li; R. H. Chen;T. S. Cheng

Comments

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Abbreviated Journal Title

Combust. Sci. Technol.

Keywords

blowout velocity; blowout limits; inert dilution; jet flames; DIFFUSION FLAMES; BURNING VELOCITIES; PREDICTION; LIFTOFF; AIR; Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical

Abstract

An extended database on blowout velocities of inert-diluted methane, propane, and hydrogen jet flames in the turbulent regime was experimentally established and used to examine and verify existing theories of blowout velocity estimation. Helium, argon, nitrogen, and carbon dioxide were used as the inert diluents to generate different initial properties at the jet exit. The theories of blowout velocity estimation by Kalghatgi (Combust. Sci. Technol., vol. 26, pp. 233-239, 1981) and Broadwell et al. (Proc. Combust. Instit., vol. 20, pp. 303-310, 1984) in the highly diluted regime were carefully examined using jet flames of different fuels diluted with inerts of different gas properties. The results showed that among the theories the blowout velocity estimation of Kalghatgi is more reliable in the extended region. On the other hand, the blowout velocity estimation of Broadwell et al. can do as well after proper modi. cation by including the Reynolds number effect Re-f. Based on the experimental results, modi. cations to the theories are proposed to accommodate for the deviation when they are used in the diluted regime. In addition, different from laminar jet flames, diffusive properties in terms of mass and thermal diffusivities are not the dominant parameters of blowout velocity in turbulent jet flames.

Journal Title

Combustion Science and Technology

Volume

176

Issue/Number

10

Publication Date

1-1-2004

Document Type

Article; Proceedings Paper

Language

English

First Page

1735

Last Page

1753

WOS Identifier

WOS:000223661700009

ISSN

0010-2202

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