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Thermal performance of a micro combustor with heat recirculation

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Title Thermal performance of a micro combustor with heat recirculation
 
Creator TAYWADE, UW
DESHPANDE, AA
KUMAR, S
 
Subject Flame stability
Heat recirculation
Micro combustion
Spinning flames
MESOSCALE NONADIABATIC DUCTS
RADIAL MICROCHANNEL
FLAME
MIXTURES
BEHAVIOR
CHANNEL
METHANE
SYSTEM
 
Description In this paper, numerical and experimental investigations in a three-step microcombustor have been carried out to understand the effect of heat recirculation on flame stabilization behavior with premixed fuel-air mixtures. External heating cup is utilized to enhance the heat recirculation. From numerical simulations, it was observed that the extent of heat recirculation is a function of cup dimensions, cup material, and flow velocity and mixture equivalence ratio. Heat recirculation has been observed to significantly enhance the flame stability limits and upper flame stability limits were observed for the range of flow rates investigated during the present work. Stable flames exist for smaller flow rates with a minimum thermal input of similar to 2.2 W at Phi=0.5. X-shaped spinning flames exist for inter-mediate flow rate conditions with and without heat recirculation for a broad range of equivalence ratios. These X-shaped flames rotate around the axis at similar to 100-150 Hz frequency. The average combustor wall temperature increases with the flow velocity for the stable flame mode and remain mostly uniform and well distributed for the X-shaped spinning flame mode. Heat recirculation helps in increasing the mean wall temperature of the combustor by similar to 100-400 K. (C) 2012 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-14T17:09:51Z
2014-10-14T17:09:51Z
2013
 
Type Article
 
Identifier FUEL PROCESSING TECHNOLOGY, 109179-188
http://dx.doi.org/10.1016/j.fuproc.2012.11.002
http://dspace.library.iitb.ac.in/jspui/handle/100/14532
 
Language en