The analytical investigation of premixed combustion in cylindrical micro-combustor
Journal article, 2011
In this study, an analytical model for heat recirculation in cylindrical micro-combustors
is presented, including the effects of heat transfer from the product gas stream in the reaction zone
and post-ﬂame region to the reactant in the preheat zone, structural heat conduction through the
combustor walls and heat loss to ambient. Eventually, the explicit expression for the ﬂame speed
in non-adiabatic condition and the implicit expression for adiabatic condition are obtained in this
research. In addition, comparison is made between adiabatic and non-adiabatic ﬂame speeds.
It is demonstrated that the streamwise heat conduction through the structure of combustor
plays an important role in the ﬂame broadening in both adiabatic and non-adiabatic conditions.
Moreover, it is shown that reducing the size of the combustor to a submillimetre scale extremely
increases the surface-to-volume ratio, leading to the decrease in the ﬂame speed and ﬂame
heat recirculation effect
non-adiabatic ﬂame speed
adiabatic ﬂame speed