Hydrogen/oxygen premixed combustion characteristics in micro porous media combustor

Fundamental flame characteristics of premixed H2–air combustion in a planar porous micro-combustor

“…Assuming a thermal equilibrium is equivalent to allowing heat transfer to occur instantaneously, which inherently precludes some important features of filtration combustion, for example, excess enthalpy combustion. Despite its deficiency in physics, the one-temperature model which was implemented in modeling micro-/meso-combustors has been found to be able to yield reasonable prediction of combustor wall temperature [23,24]. Under Assumption (7), the gaseous mixture and the solid matrix have one temperature (denoted as T g ), with the porous zone being represented by a lumped parameter, that is, the effective thermal conductivity (defined as k eff ).…”

“…Chua et al [23] reported their simulation and experimental study on a planar micro-combustor fully filled with SiC foam, focusing on the wall temperature and emitter efficiency. Through CFD simulations, Pan et al [24] investigated H 2 -O 2 combustion in a cylindrical micro-combustor filled with SiC porous medium. The parameters studied include the equivalence ratio, flow velocity, porosity and conductivity of the solid matrix.…”

Flame behavior inside constant diameter cylindrical meso­scale combustor with different backward facing step size

“…Many researchers have developed particular treatment in micro combustors to increase flame stability, based on the effects of heat recirculation, flow recirculation, materials, media, geometry, and so on. Several methods were used to stabilize the flame in a micro-or meso-combustor such as the use of wire mesh [4], external heating [10], heat recirculation [12], porous media [13], catalyst material [14], enlargement of the combustor diameter [15], and the use of backward facing step [6,16,17]. Investigation of the use of the backward facing step to stabilize combustion in micro combustors was carried out by [6].…”

Effect of backward facing step on combustion stability in a constant contact area cylindrical meso­scale combustor

“…an increase of the surface to volume ratio, hence intensifies the heat loss to heat generation ratio and reduces flame stability inside the combustor [1,5,9]. Many research has been conducted to improve the stability of combustion in micro-or meso-scale combustors [6], such as using catalytic combustion [10], application of porous media combustion for micro thermophotovoltaic system [11], combustion of hydrosgen-oxygen mixture using microporous media [12], external heating [13], and heat recirculation in the combustor [14]. Stable combustion also could be established inside the meso-scale combustor using inserted wire mesh which has two functions as a flame holder and increases heat recirculation from the flame to burn reactant [1].…”