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Numerical investigations of unsteady flame propagation in stepped microtubes

DSpace at IIT Bombay

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Title Numerical investigations of unsteady flame propagation in stepped microtubes
 
Creator SINGH, AP
RATNAKISHORE, V
MINAEV, S
KUMAR, S
 
Subject LAMINAR BURNING VELOCITY
STEPWISE DIVERGING TUBE
METHANE-AIR MIXTURES
PREMIXED FLAMES
COMBUSTION COMPLETENESS
MICROSCALE
CONFIGURATION
ACCELERATION
STABILITY
DYNAMICS
 
Description Transient numerical simulations with detailed chemistry have been carried out for premixed stoichiometric CH4-air and H-2-air flames in two-dimensional stepped microtubes for a range of wall heat transfer conditions. Investigations on such configurations are important from the perspective of the design of micro combustion devices, flame arresters and safety in domestic and industrial combustion devices. Similarities in flame propagation characteristics have been brought out through a detailed analysis for both the fuels. Detailed analysis of the propagating flame near the channel step revealed an interesting phenomenon of sudden increase in flame propagation velocities for a certain range of wall heat transfer coefficient, h. A quantitative value of ratio of heat-loss to heat-generation at the contraction has been proposed which helps predict the flame propagation through sudden channel steps.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2016-01-15T07:28:51Z
2016-01-15T07:28:51Z
2015
 
Type Article
 
Identifier RSC ADVANCES, 5(122)100879-100890
2046-2069
http://dx.doi.org/10.1039/c5ra21704k
http://dspace.library.iitb.ac.in/jspui/handle/100/18051
 
Language en