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Experimental investigations on a new active swirl based microcombustor for an integrated micro-reformer system

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Title Experimental investigations on a new active swirl based microcombustor for an integrated micro-reformer system
 
Creator SAHOTA, GPS
KHANDELWAL, B
KUMAR, S
 
Subject COMBUSTION
BURNER
FLAMES
FLOW
Microcombustors
Active flow swirl
Flame stability
Micro-reformer
 
Description In this paper, a new active swirl based concept has been proposed to enhance the flame stability limits in backward facing step microcombustors with premixed methane-air mixtures. A two step backward facing microcombustor with an inlet diameter of 2 mm along with 4 mm for first step and 6 mm diameter for second step is considered and the performance of various active and passive swirl generation techniques has been investigated and compared. For passive swirl techniques, such as strip and wire swirlers, the upper flame stability limits are enhanced as compared to the no swirl case. However, for active swirl case, when precisely controlled secondary flow is used for swirl generation, both upper and lower flame stability limits are significantly enhanced. For instance, the upper flame stability limits are enhanced by 54% and lower flame stability limits are enhanced by 17% at a mixture equivalence ratio of phi = 0.6 with active swirl flow. A stable flame has been observed to exist for a wide range of mixtures with equivalence ratio varying from 0.6 to 1.3 and flow rates varying from 98 to 1270 SCCM (equivalent thermal input 4.58-91.66 W). A minimum thermal input of 4.58 W with a heat release density of about 9.75 MW/m(3) was observed in the present experiments. (C) 2011 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2012-06-26T06:38:22Z
2012-06-26T06:38:22Z
2011
 
Type Article
 
Identifier ENERGY CONVERSION AND MANAGEMENT,52(10)3206-3213
0196-8904
http://dx.doi.org/10.1016/j.enconman.2011.05.007
http://dspace.library.iitb.ac.in/jspui/handle/100/14057
 
Language English