Effects of multi-component diffusion and heat release on laminar diffusion flame liftoff

    Authors

    Z. L. Li; R. H. Chen;T. X. Phuoc

    Comments

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    Abbreviated Journal Title

    Combust. Flame

    Keywords

    Stabilization; Diffusion flame; Schmidt number; Transport properties; REACTION KERNEL STRUCTURE; NONPREMIXED JET; LIFTED FLAMES; STABILITY; STABILIZATION; Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical

    Abstract

    Numerical simulations were conducted of the liftoff and stabilization phenomena of laminar jet diffusion flames of inert-diluted C(3)H(8) and CH(4) fuels. Both non-reacting and reacting jets were investigated, including multi-component diffusivities and heat release effects (buoyancy and gas expansion). The role of Schmidt number for non-reacting jets was investigated, with no conclusive Schmidt number criterion for liftoff previously arrived at in similarity solutions. The cold-flow simulation for He-diluted CH(4) fuel does not predict flame liftoff; however, adding heat release reaction lead to the prediction of liftoff, which is consistent with experimental observations. Including reaction was also found to improve liftoff height prediction for C(3)H(8) flames, with the flame base location differing from that in the similarity solution - the intersection of the stoichiometric and iso-velocity (equal to 1-D flame speed) is not necessary for flame stabilization (and thus liftoff). Possible mechanisms other than that proposed for similarity solution may better help to explain the stabilization and liftoff phenomena. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

    Journal Title

    Combustion and Flame

    Volume

    157

    Issue/Number

    8

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    1484

    Last Page

    1495

    WOS Identifier

    WOS:000279300800005

    ISSN

    0010-2180

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