Flame speed predictions in planar micro/mesoscale combustors with conjugate heat transfer

Veeraragavan, Ananthanarayanan and Cadou, Christopher P. (2011) Flame speed predictions in planar micro/mesoscale combustors with conjugate heat transfer. Combustion and Flame, 158 11: 2178-2187. doi:10.1016/j.combustflame.2011.04.006


Author Veeraragavan, Ananthanarayanan
Cadou, Christopher P.
Title Flame speed predictions in planar micro/mesoscale combustors with conjugate heat transfer
Journal name Combustion and Flame   Check publisher's open access policy
ISSN 0010-2180
1556-2921
Publication date 2011-11
Sub-type Article (original research)
DOI 10.1016/j.combustflame.2011.04.006
Volume 158
Issue 11
Start page 2178
End page 2187
Total pages 10
Place of publication New York, NY, U.S.A.
Publisher Elsevier
Collection year 2012
Language eng
Formatted abstract
An analytical model for flame stabilization in meso-scale channels is developed by solving the two-dimensional partial differential equations associated with heat transport in the gas and structure and species transport in the gas. It improves on previous models by eliminating the need to assume values for the Nusselt numbers in the pre and post-flame regions. The effects of heat loss to the environment, wall thermal conductivity, and wall geometry on the burning velocity and extinction are explored. Extinction limits and fast and slow burning modes are identified but their dependence on structure thermal conductivity and heat losses differ from previous quasi one-dimensional analyses. Heat recirculation from the post-flame to the pre-flame is shown to be the primary mechanism for flame stabilization and burning rate enhancement in micro-channels. Combustor design parameters like the wall thickness ratio, thermal conductivity ratio, and heat loss to the environment each influence the flame speed through their influence on the total heat recirculation. These findings are used to propose a simple methodology for preliminary micro-combustor design.
Keyword Micro-combustion
Micro-channel
Flame speed
Heat recirculation
Conjugate heat transfer
Micro-propulsion
Dynamics
Exchangers
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Non HERDC
 
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Created: Wed, 16 May 2012, 12:48:57 EST by Anand Veeraragavan on behalf of School of Mechanical and Mining Engineering