DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/14041

Title: Experimental studies on dynamics of methane-air premixed flame in meso-scale diverging channels
Authors: AKRAM, M
KUMAR, S
Keywords: HEAT-RECIRCULATING COMBUSTORS
LAMINAR-BURNING VELOCITY
RADIAL MICROCHANNELS
HYDROGEN/AIR FLAMES
MIXTURES
TEMPERATURE
PROPAGATION
STABILIZATION
REGIMES
NUMBER
Issue Date: 2011
Publisher: ELSEVIER SCIENCE INC
Citation: COMBUSTION AND FLAME,158(5)915-924
Abstract: The propagation characteristics of a laminar premixed flame front in meso-scale straight and diverging channels of 5 degrees, 10 degrees and 15 degrees with inlet dimension of 25 mm x 2 mm are reported in this paper. The downstream part of the channels was heated with an external heat source, to maintain a positive wall temperature gradient along the direction of fluid flow. These investigations show that planar flames are observed near flash back limits. Negatively stretched flames were observed for moderate flow rates and rich mixtures and for high flow rates, flames were positively stretched. These flames were either symmetric or asymmetric in nature. Partially stable flames were observed at high velocities for rich mixtures, whereas for lean mixture partially stable flames were observed for all flow rates. All the divergent channels showed an improvement in high velocity limits compared with the straight channel for the same mixture. Planar flames observed in the experiments helped in determining the laminar burning velocities for these mixtures at different preheat temperatures. A co-relation of laminar burning velocity with mixture preheat temperature is also obtained for a stoichiometric methane-air mixture. This co-relation S(u)/S(u,o) = (T(u)/T(u,o))(1.558) is in good agreement with the earlier co-relations. (C) 2011 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
URI: http://dx.doi.org/10.1016/j.combustflame.2011.02.011
http://dspace.library.iitb.ac.in/jspui/handle/100/14041
ISSN: 0010-2180
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

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

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback