Abstract
The Response Surface Methodology (RSM) has been applied to explore the thermal structure of the experimentally studied catalytic combustion of stabilized confined turbulent gaseous diffusion flames. The Pt/γAl2O3 and Pd/γAl2O3 disc burners were situated in the combustion domain and the experiments were performed under both fuel-rich and fuel-lean conditions at a modified equivalence (fuel/air) ratio (o) of 0.75 and 0.25 respectively. The thermal structure of these catalytic flames developed over the Pt and Pd disc burners were inspected via measuring the mean temperature profiles in the radial direction at different discrete axial locations along the flames. The RSM considers the effect of the two operating parameters explicitly (r), the radial distance from the center line of the flame, and (x), axial distance along the flame over the disc, on the measured temperature of the flames and finds the predicted maximum temperature and the corresponding process variables. Also the RSM has been employed to elucidate such effects in the three and two dimensions and displays the location of the predicted maximum temperature.
Highlights
The thermal structure of these catalytic flames developed over the Pt and Pd disc burners were inspected via measuring the mean temperature profiles in the radial direction at different discrete axial locations along the flames
The Response Surface Methodology (RSM) considers the effect of the two operating parameters explicitly (r), the radial distance from the center line of the flame, and (x), axial distance along the flame over the disc, on the measured temperature of the flames and finds the predicted maximum temperature and the corresponding process variables
Arani et al [1] carried out three-dimensional direct numerical simulations (DNS) with detailed heterogeneous and homogeneous chemistry and transport to investigate the turbulent combustion of fuel-lean hydrogen/air mixtures in a platinum-coated channel with prescribed wall temperatures
Summary
Lucci et al [6] investigated the turbulent catalytic combustion of a fuel-lean hydrogen/air mixture by means of three-dimensional direct numerical simulation (DNS) in a platinum-coated plane channel. Schultze et al [7] investigated experimentally and numerically employing two-dimensional model the hetero/homogeneous combustion of hydrogen/air mixture over Pt at stochiometries: 2.0 ≤ Ø ≤ 7.0 at 1.0 bar ≤ p ≤ 5 bar. Schultze & Mantzaras [3] employed two-dimensional numerical simulations models to deal with the physicochemical processes during the fuel-lean and fuel rich catalytic combustion of hydrogen/air mixtures in platinum-coated channels. Arani et al [1] carried out three-dimensional direct numerical simulations (DNS) with detailed heterogeneous and homogeneous chemistry and transport to investigate the turbulent combustion of fuel-lean hydrogen/air mixtures in a platinum-coated channel with prescribed wall temperatures. RSM has been utilized to demonstrate such effects in the three and two dimensions and shows the location of the predicted optimum maximum temperature for the scrutinized catalytic disc burners under fuel-rich and fuel-lean conditions
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