Effects of foam structure and material on the performance of premixed porous ceramic burner

Shakiba, S. Akbar; Ebrahimi, Reza; Shams, Mehrzad; Yazdanfar, Zeinab

doi:10.1177/0957650914558166

Cited by 19 publications

(9 citation statements)

References 38 publications

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“…Effects of the material and shape of the porous media on the flame dynamics and pollutant emissions were studied by several researchers. 8–10 Results suggested that solid matrix had an effective role on flame situation and pollutant formation controlling. Experimental study examining the influence of solid structure on the performance of the premixed methane–air combustion in a two-layer porous burner showed that the flame stability limit as well as flame peak temperature were enhanced by increasing the diameter of the alumina pellets.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the premixed methane–air combustion through the combined porous-free flame burner by numerical simulation

Hashemi

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Combustion process of the premixed methane–air in a novel combined porous-free flame burner was investigated numerically. Two-dimensional model considering nonequilibrium thermal condition between the gas and solid phases was used and the combustion was simulated using reduced GRI 3.0 multistep chemical kinetics mechanism. To examine the validity of the implemented numerical model, the burner was manufactured and tested. Good agreement between the numerical results and experimental data were observed. Thermal flame thickness, flame stability limit, and thermal efficiency were discussed. Multimode heat transfer in the porous medium including convection, radiation, and conduction were quantified and perused. Results showed that the thermal thickness of laminar free flame established in the perforated portion of the burner was considerably less than thickness of submerged flame stabilized in the porous medium. Predicted results suggested that the flame stability limit was augmented in the combined burner compared to the burner with full porous foam. Analyses of the heat balance showed that the thermal efficiency of the combined porous-free flame burner was less than thermal efficiency of the full porous burner. Comparison of the full porous burner with the novel combined porous-free flame burner demonstrated that the combined burner caused higher stability limits and lower thermal efficiencies.

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Section: Introductionmentioning

confidence: 99%

Investigation of the premixed methane–air combustion through the combined porous-free flame burner by numerical simulation

Hashemi

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…In more recent studies, Keramiotis, Stelzner and Trimis (2012) performed a comprehensive experimental study to investigate thermal efficacy, pollutant emissions and stable operating range of a porous burner for methane and LPG. Shakiba et al (2015) experimentally investigated the effects of foam properties on the porous burner performance. Experiments are conducted for different materials, pore densities and porosities.…”

Section: Introductionmentioning

confidence: 99%

Üç Katmanli Gözenekli̇ Yakicida Ön Karişimsiz Yanmanin Flamelet Modeli̇ İle Sayisal İncelenmesi̇

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Tunçer

et al. 2021

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Purpose of this study is to numerically investigate combustion within a porous channel, which has three layers with different pore densities. Non-premixed combustion inside the porous channel is modelled with thermal nonequilibrium energy equations. Flow and chemistry are decoupled with tabulated chemistry using flamelets, thereby reducing the computational cost. GRI 3.0 mechanism is used to account for methane/air combustion. Simulations are performed for different pore densities at the third layer in 8-30 PPI range. Also, the effects of thermal power and excessair-ratio (EAR) are investigated for the porous burner. Temperatures and species mass fraction distributions are obtained. Maximum temperature in the burner found to be similar for all cases since combustion occurs in stoichiometric conditions at the flame front as a result of the non-premixed combustion model. NOx and CO emissions values of all simulations are compared against international gas emission standards. This comparison showed that while CO emissions are always below all international standards, NOx emissions are below these limits only for high values of excess air ratio and thermal power. Besides, as the pore density of the third layer is decreased, the values of emissions decrease strongly.

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“…Various experimental and numerical investigations examined the effects of geometrical and thermophysical properties of porous matrix on flame characteristics in the porous burner. 19–24…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Ghorashi

Hashemi

Mollamahdi

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present work implements a numerical simulation to investigate the combustion process in a porous-free flame burner. The non-equilibrium thermal condition is performed, and discretization and solving of the governing equations are conducted in a two-dimensional axisymmetric model. In order to simulate the combustion process, a reduced chemical kinetic mechanism of GRI 3.0, which includes 16 species and 41 reactions, is used. In order to prove the precision of the numerical method, some experimental tests are carried out and the numerical results are in a good agreement with the experimental measurements. The numerical results demonstrate that the porous-free flame burner has a higher flame stability compared to the conventional porous burner and the radiative efficiency of the porous-free flame burner is less than the porous burner. In addition, an increase in thermal conduction of the porous medium leads to an extension in the flame stability. In addition, the results show that with decreasing the pore density of porous medium, the flame stability is extended.

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Effects of foam structure and material on the performance of premixed porous ceramic burner

Cited by 19 publications

References 38 publications

Investigation of the premixed methane–air combustion through the combined porous-free flame burner by numerical simulation

Investigation of the premixed methane–air combustion through the combined porous-free flame burner by numerical simulation

Üç Katmanli Gözenekli̇ Yakicida Ön Karişimsiz Yanmanin Flamelet Modeli̇ İle Sayisal İncelenmesi̇

Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

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