Abstract
Premixed combustion of lean methane–air in an artificial porous media burner with staggered alumina cylinders was experimentally and numerically performed. Numerical simulations were conducted at gas mixture velocities of 0.43–0.86 m/s and equivalence ratios of 0.162 and 0.243, respectively. Through comparison with experimental results, temperature distribution, peak temperature and flame propagation velocity are analyzed and discussed in detail. The numerical calculated temperature profile over the axis of the combustor coincided well with test data in the post-flame zone, however a certain deviation was found in the preheated zone. A two-dimensional flame shape was observed and the flame thickness was the size of cylinder diameter. The peak temperature increased with the gas mixture inlet velocity at the certain equivalence ratio, and its peak value was about 1.8–2.16 times higher than the adiabatic combustion temperature under the desired equivalence ratio, which indicates that super-adiabatic combustion was the case for all the numerical simulations. The flame propagating velocity had a positive correlation with the gas mixture inlet velocity.
Highlights
Porous media combustion (PMC) technology has extensively attracted more and more attention as a result of many excellent characteristics such as a higher combustion wave velocity, wider range of power variation, extended flammability limit and lower emission levels of pollutants [1,2,3,4,5,6,7,8,9,10,11,12,13]
The temperature profiles by numerical simulation and experimental data are presented in Figure 6 for the equivalence ratio of φ = 0.162 and gas mixture inlet velocity of u0 Results
The predicted temperatures were selected by the gas and solid phases along the and Analysis centerline of the porous burner
Summary
Porous media combustion (PMC) technology has extensively attracted more and more attention as a result of many excellent characteristics such as a higher combustion wave velocity, wider range of power variation, extended flammability limit and lower emission levels of pollutants [1,2,3,4,5,6,7,8,9,10,11,12,13]. The heat transfer mechanism of porous media combustion is to recirculate the thermal energy from the burnt gaseous mixture to the incoming reactants as combustion occurs, which can lead to super-adiabatic combustion. Many types of porous media structures have been encountered in the applications mentioned above, including pellets, lamellas, and foam materials. Randomly packed pebble bed is Energies 2020, 13, 6397; doi:10.3390/en13236397 www.mdpi.com/journal/energies
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