Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.cej.2009.02.015
Title: A numerical study on premixed micro-combustion of CH4-air mixture: Effects of combustor size, geometry and boundary conditions on flame temperature
Authors: Li, J.
Chou, S.K. 
Yang, W.M. 
Li, Z.W. 
Keywords: Boundary conditions
Flame temperature
Methane-air
Micro-combustion
Numerical simulation
Issue Date: 15-Jul-2009
Source: Li, J., Chou, S.K., Yang, W.M., Li, Z.W. (2009-07-15). A numerical study on premixed micro-combustion of CH4-air mixture: Effects of combustor size, geometry and boundary conditions on flame temperature. Chemical Engineering Journal 150 (1) : 213-222. ScholarBank@NUS Repository. https://doi.org/10.1016/j.cej.2009.02.015
Abstract: A numerical study on CH4-air premixed combustion in micro-combustors was undertaken by solving the 2D governing equations. The effects of combustor size and geometry, inlet velocity profile and slip-wall boundary condition on the flame temperature were investigated. The simulation results showed that a larger combustor (d = 2 mm) gives higher flame temperature only when the flow velocity is below a certain level. With regard to the combustor geometry, a 2D planar channel (H = 1 mm) represents higher flame temperature than a cylindrical tube with d = 2 mm (equal hydrodynamic diameter), over the velocity range covered by the present study. In addition, it was noted that the flame temperatures in the cylindrical tube and 2D planar channel are quite close when H = 0.65d is satisfied. The fully developed velocity profile applied at the inlet plane was found to have the flames anchored further from the entrance than the uniform profile, but no remarkable difference in terms of flame temperature (≤3 K) was observed. A simple analysis of the competing time scales (axial convection and radial diffusion) was presented to address the difference of flame structure between the methane-air and hydrogen-air mixtures. Finally, it was shown that in a combustor with d = 1 mm the effects of slip-wall boundary are negligible, compared to the bulk velocity and gases temperature. © 2009 Elsevier B.V. All rights reserved.
Source Title: Chemical Engineering Journal
URI: http://scholarbank.nus.edu.sg/handle/10635/84807
ISSN: 13858947
DOI: 10.1016/j.cej.2009.02.015
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

79
checked on Apr 10, 2018

WEB OF SCIENCETM
Citations

63
checked on Apr 10, 2018

Page view(s)

56
checked on Apr 20, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.