Propagation, Structure, and Limit Phenomena of Laminar Flames at Elevated Pressures

Law, Chung K.

doi:10.1080/00102200500290690

Cited by 78 publications

(17 citation statements)

References 26 publications

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“…Since the (adiabatic) flame temperature T f increases only slightly with increasing pressure [23], this density ratio is nearly pressure independent. Consequently, the upward velocity v and hence the flame stretch rate K are likewise nearly pressure independent.…”

Section: Theoretical Backgroundmentioning

confidence: 94%

Calculation of the upper flammability limit of methane/air mixtures at elevated pressures and temperatures

Schoor

Verplaetsen²,

Berghmans

2008

Journal of Hazardous Materials

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Section: Theoretical Backgroundmentioning

confidence: 94%

Calculation of the upper flammability limit of methane/air mixtures at elevated pressures and temperatures

Schoor

Verplaetsen²,

Berghmans

2008

Journal of Hazardous Materials

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“…The planar flame, the simplest form of combustion illustrating the propagating nature of premixed flames, is amenable to analysis that provides fundamental understanding of the intrinsic instabilities observed in laboratory experiments; see for example Markstein (1951), Palm-Lewis & Strehlow (1969), Groff (1982), Sivashinsky (1983), Clavin (1985), Bradley et al (2000) and Bradley, Cresswell & Puttock (2001), Law (2006) and Matalon (2007). Excluding acoustic and buoyancy effects, a planar premixed flame can be rendered unstable by hydrodynamic and thermodiffusive mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic and thermodiffusive instability effects on the evolution of laminar planar lean premixed hydrogen flames

et al. 2012

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Numerical simulations with single-step chemistry and detailed transport are used to study premixed hydrogen/air flames in two-dimensional channel-like domains with periodic boundary conditions along the horizontal boundaries as a function of the domain height. Both unity Lewis number, where only hydrodynamic instability appears, and subunity Lewis number, where the flame propagation is strongly affected by the combined effect of hydrodynamic and thermodiffusive instabilities are considered. The simulations aim at studying the initial linear growth of perturbations superimposed on the planar flame front as well as the long-term nonlinear evolution. The dispersion relation between the growth rate and the wavelength of the perturbation characterizing the linear regime is extracted from the simulations and compared with linear stability theory. The dynamics observed during the nonlinear evolution depend strongly on the domain size and on the Lewis number. As predicted by the theory, unity Lewis number flames are found to form a single cusp structure which propagates unchanged with constant speed. The long-term dynamics of the subunity Lewis number flames include steady cell propagation, lateral flame movement, oscillations and regular as well as chaotic cell splitting and merging.

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“…LFL given in EN 1839 (B) standard is 4.0 mol% H 2 . The important discrepancy between lower flammability limits is due to the very particular behavior of the hydrogen flame specially in lean mixtures [51,52]. The difference between values of Bone et al and the ones of Coward and Jones is essentially due to the limit definition.…”

Section: Safe Methods 4211 Lean Mixtures Hydrogen Is Introduced Imentioning

confidence: 96%

Risk assessment for the preparation of compressed oxidant–fuel gas mixtures. Application to the H2/air mixture manufacturing

Paillard¹,

Naudet²

2012

International Journal of Hydrogen Energy

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Propagation, Structure, and Limit Phenomena of Laminar Flames at Elevated Pressures

Cited by 78 publications

References 26 publications

Calculation of the upper flammability limit of methane/air mixtures at elevated pressures and temperatures

Calculation of the upper flammability limit of methane/air mixtures at elevated pressures and temperatures

Hydrodynamic and thermodiffusive instability effects on the evolution of laminar planar lean premixed hydrogen flames

Risk assessment for the preparation of compressed oxidant–fuel gas mixtures. Application to the H2/air mixture manufacturing

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