Title

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

Authors

Authors

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

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

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

Share

COinS