Pore-scale study of complex flame stabilization phenomena in thin-layered radial porous burner

2021 ◽  
Vol 231 ◽  
pp. 111468
Author(s):  
Igor Yakovlev ◽  
Anatoly Maznoy ◽  
Sergey Zambalov
Keyword(s):  
Flame Stabilization ◽  
Pore Scale ◽  
Porous Burner

Pore-scale flame dynamics in a one-layer porous burner

2021 ◽  
pp. 111711
Author(s):  
Roman V. Fursenko ◽  
Igor A. Yakovlev ◽  
Egor S. Odintsov ◽  
Sergey D. Zambalov ◽  
Sergey S. Minaev
Keyword(s):  
Pore Scale ◽  
Flame Dynamics ◽  
Porous Burner

Three-Dimensional Pore-Scale Simulation of Non-Equilibrium in a Two-Layer Porous Burner

2021 ◽  
Author(s):  
Yang Liu ◽  
Yangbo Deng ◽  
Junrui Shi ◽  
Tingting Yan ◽  
Zhenyu Min ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Pore Scale ◽  
Porous Burner ◽  
Non Equilibrium

Flame Stabilization and Emissions of a Natural Gas/Air Ceramic Porous Burner

2008 ◽  
Vol 47-50 ◽  
pp. 105-108 ◽  
Author(s):  
Neda Djordjevic ◽  
Peter Habisreuther ◽  
Nikolaos Zarzalis
Keyword(s):  
Gas Turbines ◽  
Premixed Flames ◽  
Stability Limit ◽  
Porous Matrix ◽  
Flame Stabilization ◽  
Pollutant Emissions ◽  
Inert Material ◽  
Flame Stability ◽  
Nox Emissions ◽  
Porous Burner

Increasingly stringent regulations for limiting pollutant emissions for both aircraft and industrial gas turbines enforce further reduction of NOx emissions while maintaining flame stability. Application of premixed flames offers the possibility to reduce these emissions, but nevertheless it is strongly connected with flame instability risks. A possible solution to ensure the stability of premixed flames is to provide enhanced heat recirculation employing porous inert material. Experimental determination of flame stability and emissions of a porous burner containing a reticulate ceramic sponge structure are reported and the influence of the structural properties of the porous matrix on stable operating range was investigated. It was found, that the flame stability limit was significantly higher compared with free flame burners and nitric oxide (NOx) emissions were below 10 ppm for all cases.

Numerical study of the effects of material properties on flame stabilization in a porous burner

2003 ◽  
Vol 134 (4) ◽  
pp. 369-379 ◽  
Author(s):  
Amanda J Barra ◽  
Guillaume Diepvens ◽  
Janet L Ellzey ◽  
Michael R Henneke
Keyword(s):  
Material Properties ◽  
Numerical Study ◽  
Flame Stabilization ◽  
Porous Burner

Modeling of Premixed Combustion in a Double-Layered Radiant Porous Burner

2001 ◽  
Author(s):  
L. Younis ◽  
A. A. Mohamad ◽  
I. Wierzba
Keyword(s):  
Thermal Conductivity ◽  
Solid Phase ◽  
Combustion Process ◽  
Radiant Energy ◽  
Flame Stabilization ◽  
High Thermal Conductivity ◽  
Energy Output ◽  
High Porosity ◽  
Porous Burner ◽  
Low Porosity

Abstract Porous radiant burners are widely used in industry to provide a uniform source of heat flux with reduced emissions. Such burners have provided high rates of heat transfer by radiation while preventing flame flashback. The work to be presented relates to the modeling of the combustion process in a double-layered flat porous burner. The burner employs a low porosity layer on the upstream side and high porosity layer on the downstream side of the homogenous fuel-air mixture flow. The nonequilibrium model is adopted. The energy equations for the gas and solid media are solved numerically with a one step reaction (Arrhenius type) energy release rate for the gas-phase. The solid phase is considered to be non-reactive. The thermophysical properties of the gas and solid phases are assumed to be functions of temperature. The effects of thermal conductivity and thickness of the layers on the flame stabilization within the porous medium and radiant energy output are investigated and discussed. The high thermal conductivity layer diffuses heat and thus has significant effects on the flame location and flame temperature. However, the high thermal conductivity of the layer also contributes to a decrease in the radiant energy. It was found that generally the flame stabilizes at the interface between the two layers. When the thermal conductivity of the upstream low porosity layer was too low (e.g. 0.1 W/m.K), the flame was stabilized within the low porosity layer.

A NUMERICAL STUDY ON THE SECOND LAW ANALYSIS OF THE FLAME STABILIZATION AND OPTIMIZATION IN A POROUS BURNER

2010 ◽  
Vol 13 (10) ◽  
pp. 875-894 ◽  
Author(s):  
M. Bidi ◽  
M. R. H. Nobari ◽  
M. Saffar Avval ◽  
A. Yarahmadi
Keyword(s):  
Numerical Study ◽  
Flame Stabilization ◽  
Second Law ◽  
Porous Burner ◽  
Second Law Analysis

Numerical study of the flame stability of premixed methane–air combustion in a combined porous-free flame burner

2018 ◽  
Vol 233 (4) ◽  
pp. 530-544 ◽  
Author(s):  
Seyed Mohammad Hashemi ◽  
Seyed Abdolmehdi Hashemi
Keyword(s):  
Equivalence Ratio ◽  
Numerical Study ◽  
Flame Stabilization ◽  
Pollutant Emissions ◽  
Pollutant Emission ◽  
Flame Stability ◽  
Emission Analysis ◽  
Porous Burner ◽  
Flame Burner ◽  
Stability Limits

Premixed methane–air combustion process within a combined porous-free flame burner was investigated numerically in the present study. The burner consisted of a perforated porous ceramic pellet forming combination of submerged and free flame zones. Nonequilibrium thermal condition between the gas and solid phases was implemented and governing equations were solved in a two-dimensional model using finite volume method. Detailed chemistry based on reduced GRI 3.0 mechanism with 41 reaction steps and 16 species including NOx mechanisms was utilized to simulate the combustion processes and pollutant emissions. In order to investigate the validation of the implemented numerical model, the burner was manufactured and tested. The predicted results were consistent with the experimental data. Comparison of the combined porous-free flame burner with porous burner showed that the flame stability limits of the combined burner were higher than those of porous burner. Multimode heat transfer within the porous medium was perused and the effect of heat recirculation on the flame stabilization was discussed. Investigation of the effect of pore density on the flame stabilization showed that the lower pore densities were desirable in order to improve the flame stability limits. Pollutant emission analysis proved that the NO concentration increased with increasing the equivalence ratio while the minimum quantity of CO concentration was evaluated at an equivalence ratio of 0.6.

Flame stabilization between two beds of alumina balls in a porous burner

2010 ◽  
Vol 30 (2-3) ◽  
pp. 92-95 ◽  
Author(s):  
Valeri Bubnovich ◽  
Mario Toledo ◽  
Luis Henríquez ◽  
César Rosas ◽  
Julio Romero
Keyword(s):  
Flame Stabilization ◽  
Porous Burner
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