Effects of wall emissivity and fin blockage ratio on micro combustor performance

Abstract

Abstract Combustion system design is a complex mechanism involving several physical mechanisms such as chemical reactions, fluid dynamics and heat transfer. At micro scale, short flow residence time adds further to the complexity. Enhancement of heat transfer to the outer surface of the combustor is desirable in several power generating systems. The present work focuses on this aspect by geometrical modification in the form of wall fin and observing the change in outer wall temperature level along with heat transfer rate for various wall surface emissivities and blockage ratio (BR) of wall fin. Lower surface emissivity and higher fin blockage ratio was found to give better combustor performance in terms of outer surface temperature.