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Investigations on the Formation of Planar Flames in Mesoscale Divergent Channels and Prediction of Burning Velocity at High Temperatures

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Title Investigations on the Formation of Planar Flames in Mesoscale Divergent Channels and Prediction of Burning Velocity at High Temperatures
 
Creator AKRAM, M
MINAEV, S
KUMAR, S
 
Subject Divergent channels
Flame stabilization
Laminar burning velocity
Laminar flame propagation
Mesoscale combustion
METHANE-AIR MIXTURES
RADIAL MICROCHANNELS
COMBUSTION
 
Description Flame stabilization studies of preheated mesoscale channels of various divergent angles and aspect ratios are reported in this article. Flame propagation modes such as planar flame and negatively and positively stretched flames were observed for a range of mixture flow rates and equivalence ratios. The present investigation is focused on the formation of the planar flames in these channels. The effect, of various parameters such as channel aspect ratio, divergence angle, and heating rate on the formation of planar flames and thereby on the prediction of laminar burning velocity of various fuelair mixtures at high temperatures are discussed. Detailed investigations show that stretch-free planar flames can be stabilized in high-aspect-ratio channels with linear velocity and temperature gradient in the axial direction. Detailed numerical simulations confirm a negligible effect of heat loss on the burning velocity due to external preheating of the channel walls. Apparatus independence of the burning velocity is confirmed through experiments in channels of various aspect ratios and divergence angles for various fuelair mixtures. The proposed method of burning velocity measurement at high temperature is quite promising.
 
Publisher TAYLOR & FRANCIS INC
 
Date 2014-10-17T05:50:08Z
2014-10-17T05:50:08Z
2013
 
Type Article
 
Identifier COMBUSTION SCIENCE AND TECHNOLOGY, 185(4)645-660
0010-2202
1563-521X
http://dx.doi.org/10.1080/00102202.2012.739224
http://dspace.library.iitb.ac.in/jspui/handle/100/16110
 
Language en