Review of flashback reported in prevaporizing/premixing combustors

Plee, S. L.; Mellor, A. M.

doi:10.1016/0010-2180(78)90093-7

Cited by 98 publications

(35 citation statements)

References 3 publications

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“…In the second-more realistic-limiting case, the temperature of the wall is assumed to be fixed, equal to that of the unburned mixture upstream; then, the reaction quenches near the wall because of the lower temperatures due to heat losses, and the flame does not reach the wall. Although flashback has been the subject of a number of experimental, analytical, and numerical studies in the past [1][2][3][4][5][6][7][8][9][10], there is renewed interest in these problems because they are encountered in the development new technologies.…”

Section: Introductionmentioning

confidence: 99%

Flame flashback and propagation of premixed flames near a wall

Kurdyumov

Fernandez

Liñán

2000

Proceedings of the Combustion Institute

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The flashback or propagation of premixed flames along the near-wall low-velocity region at the base of a laminar boundary layer of a reactive mixture has been studied numerically. The analysis, carried out using the constant density approximation for an Arrhenius overall reaction, accounts for the effects of the Lewis number of the fuel. The flow field, as seen by an observer moving with the front, includes the unknown flame front velocity U relative to the wall and the linear velocity gradient A at the base of the boundary layer. Due to this gradient, the flame front is curved with a radius of curvature l F ‫ס‬ S L /A, proportional to the planar flame velocity S L . The front velocity is changed from S L by a factor which depends on the Karlovitz number, or non-dimensional wall velocity gradient, defined as the ratio between the thickness of the planar flame and the front curvature l F . The front velocity has been calculated in the limiting cases of adiabatic and isothermal walls. The front velocity changes from negative to positive when the Karlovitz number decreases below a critical value, determining the onset of flashback. This critical value, which decreases when the Lewis number of the fuel increases, is smaller for isothermal than for adiabatic walls. In this second case, when the flame is not quenched close to the wall, flashback is prevented by flame stretch associated with flame curvature.

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Section: Introductionmentioning

confidence: 99%

Flame flashback and propagation of premixed flames near a wall

Kurdyumov

Fernandez

Liñán

2000

Proceedings of the Combustion Institute

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“…Premixing allows careful control over the local flame temperatures in the combustion zone to avoid any potential Nox-forming hotspots Lean Premixed Prevaporized combustors can cause a drastic reduction in Nox emissions. However, their lean flammability limit is narrow and they tend to cause flashbacks, depending on the fuel concentration and flow velocity, compared with the commonly used diffusive combustion method [20][21][22].…”

Section: Lean Premixed Prevaporized (Lpp) Combustionmentioning

confidence: 99%

Most effective combustion technologies for reducing Nox emissions in aero gas turbines

Ommi¹,

Azimi²

2012

The International Journal of Multiphysics

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“…Flashback in premixing tubes is generally attributed to the following mechanisms [1]: (1) Flame propagation in boundary layers. The flame propagates upstream when its normal velocity exceeds the local flow velocity.…”

Section: Introductionmentioning

confidence: 99%

“…[0,1]. Here, G is assigned the value of zero in the unburned region and unit in the burnt region with the thin flame identified by a fixed value of 0<G 0 <1.…”

mentioning

confidence: 99%

Large eddy simulation of turbulent premixed combustion flows over backward facing step

Park

2011

J Mech Sci Technol

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Large eddy simulation (LES) of turbulent premixed combustion flows over backward facing step has been performed using a dynamic sub-grid G-equation flamelet model. A flamelet model for the premixed flame is combined with a dynamic sub-grid combustion model for the filtered propagation of flame speed. The objective of this study is to investigate the validity of the dynamic sub-grid G-equation model in a complex turbulent premixed combustion flow. For the purpose of validating the LES combustion model, the LES of isothermal and reacting shear layer formed at a backward facing step is carried out. The calculated results are compared with the experimental results, and a good agreement is obtained.

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Review of flashback reported in prevaporizing/premixing combustors

Cited by 98 publications

References 3 publications

Flame flashback and propagation of premixed flames near a wall

Flame flashback and propagation of premixed flames near a wall

Most effective combustion technologies for reducing Nox emissions in aero gas turbines

Large eddy simulation of turbulent premixed combustion flows over backward facing step

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