Experimental and numerical studies on the flame instabilities in porous media

Shi, Junrui; Yu, Cunjiang; Li, Ben-Wen; Xia, Yongfang; Xue, Zhaohui

doi:10.1016/j.fuel.2013.01.010

Cited by 38 publications

(16 citation statements)

References 28 publications

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“…For the numerical simulation, the mathematic models and assumptions are introduced in detail below. The models were validated in our prior works [19,20].…”

Section: Numerical Methodologymentioning

confidence: 99%

“…The user-defined scalar (UDS) and user-defined function (UDF) are loaded into Fluent6.3 to add the solid phase energy equation. The two-temperature model is established [12,13,19,20]. The SIMPLE algorithm is used to solve the coupling of pressure and velocity.…”

Section: Solution Methodsmentioning

confidence: 99%

“…Their numerical results showed that the development of the flame front inclination instability causes the essential flow non-uniformity in a packed bed. Experimentally, Shi et al [19] presented the influences of some parameters on the inclinational angle growth of the FGC flame front deformation.…”

Section: Introductionmentioning

confidence: 99%

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Flame Front Deformation Instabilities of Filtration Combustion for Initial Thermal Perturbation

et al. 2020

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The flame front deformation instability of low-velocity filtration combustion within an inert packed bed is studied based on the initial preheating non-uniformity. Based on the experimental phenomena, an initial thermal perturbation model is numerically proposed so as to predict the deformation behaviors of the flame front instabilities. The numerical prediction indicates that the assumption of an initial thermal perturbation is a feasible explanation as the cause of the flame front inclination instability. As the initial thermal perturbation increases, the phenomena of the flame front break and shrinking instabilities could easily occur at high filtration velocity or low equivalence ratio. Moreover, the evolutions of the flame front break rate and the shrinking rate are quantitatively analyzed.

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“…For the numerical simulation, the mathematic models and assumptions are introduced in detail below. The models were validated in our prior works [19,20].…”

Section: Numerical Methodologymentioning

confidence: 99%

Section: Solution Methodsmentioning

confidence: 99%

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Flame Front Deformation Instabilities of Filtration Combustion for Initial Thermal Perturbation

et al. 2020

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“…Combustion of premixed gases in inert porous materials has attracted attention over the past decades because of their advantages, such as extended lean flammability limit, low pollutant emission, high radiant output, high power density and flame speed. Therefore, porous media combustion (PMC) can be applied in the internal combustion engines, low calorific gas burners, volatile organic compound oxidizers and radiation heaters . Reticulated porous ceramics (RPCs) with an open, three‐dimensional networks structure are regarded as one of the most promising high‐temperature burners .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, porous media combustion (PMC) can be applied in the internal combustion engines, low calorific gas burners, volatile organic compound oxidizers and radiation heaters. [1][2][3] Reticulated porous ceramics (RPCs) with an open, three-dimensional networks structure are regarded as one of the most promising hightemperature burners. 4 However, the scour of flue gas and large thermal stress from the sharp temperature gradients in service made porous media easily damaged.…”

Section: Introductionmentioning

confidence: 99%

Enhanced mechanical properties of SiC reticulated porous ceramics via adjustment of residual stress within the strut

Liang

Sang

et al. 2017

Int J Applied Ceramic Tech

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Silicon carbide reticulated porous ceramics (SiC RPCs) with multi-layered struts were fabricated by polymer replica technique with SiC slurry, followed by infiltrating alumina slurries containing andalusite under vacuum condition. The effects of andalusite addition on the microstructure and mechanical properties of SiC RPCs were investigated, also the residual stress within the multi-layered strut was predicted. Theoretical calculations showed that the residual tensile stress generated in the outer layer of SiC RPCs because of its larger thermal expansion coefficient of infiltration slurry than that of SiC slurry at elevated temperature. Furthermore, the addition of andalusite reduced the thermal expansion coefficient and Young's modulus of infiltration slurries, thereby significantly reducing the residual stress of the outer layer in multi-layered struts. The reduced residual tensile stress within the outer layer was beneficial to eliminate surface cracks on the struts, thus improving the mechanical properties and thermal shock resistance of SiC RPCs. K E Y W O R D Smechanical properties, multi-layered struts, residual stress, SiC reticulated porous ceramics

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Numerical study on porosity distribution and analysis of ignition instability in packed beds of spheres

Xue

et al. 2021

Can J Chem Eng

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Porosity distribution is an important factor that affects premixed flame stability in packed beds. In this paper, the discrete element method is used to simulate the sphere packing in cylindrical, conical, and pyramidal packed beds. The anisotropic characteristics of porosity and ignition temperature distributions in packed beds are calculated and analyzed. The results show that the distance of the oscillation period of the packed bed filled with spheres of the same diameter is approximately equal to the sphere diameter. The oscillation amplitude of radial and axial porosity curves can be reduced by filling with mixed spheres of different diameters in cylindrical packed beds. The influence factors on the oscillation period distance of the radial and axial porosity curves include the diameter difference of the spheres and the mixing ratio of the number of spheres. In the cylindrical double‐layer packed beds, the interfacial porosity can be decreased by the increase of the diameter difference among the spheres. Increasing the divergent angle of the conical packed beds can weaken the influence of wall effect on the radial and axial porosities, which makes the uniformity of the porosity in the conical packed beds better than that of the cylindrical and the pyramidal beds. The inhomogeneity of tangential porosity distribution in the packed beds is inherent. In the packed beds, the ignition temperature of premixed gas is negatively correlated with porosity, sphere diameter, equivalent ratio of mixed gas, and divergent angle of conical packed beds, and it is positively correlated with superficial velocity.

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Experimental and numerical studies on the flame instabilities in porous media

Cited by 38 publications

References 28 publications

Flame Front Deformation Instabilities of Filtration Combustion for Initial Thermal Perturbation

Flame Front Deformation Instabilities of Filtration Combustion for Initial Thermal Perturbation

Enhanced mechanical properties of SiC reticulated porous ceramics via adjustment of residual stress within the strut

Numerical study on porosity distribution and analysis of ignition instability in packed beds of spheres

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