Molecular transport effects on turbulent flame propagation and structure

Lipatnikov, A.N.; Chomiak, J.

doi:10.1016/j.pecs.2004.07.001

Cited by 303 publications

(240 citation statements)

References 450 publications

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“…This instability was investigated in a number of previous analyses. 30,55,[68][69][70][71][72] The linear stability analysis of thermo-diffusive instability for planar [33][34][35][36] and spherical 73,74 laminar premixed flames resulted in analytical expressions for the instability growth rate and largest wavenumber (smallest wavelength) of a perturbation that could trigger the instability. Interested readers are referred to Refs.…”

Section: Resultsmentioning

confidence: 99%

“…An alternative concept 54,55,69,80 of the Lewis number effects in premixed turbulent combustion emphasizes the propagation of highly stretched leading reaction zones into the unburned gas (the so-called leading edge concept). However, a comparison of the thermo-diffusive instability and leading point concepts is beyond the scope of the present study.…”

Section: Resultsmentioning

confidence: 99%

“…18,[44][45][46][47][48][49][50][51][52][53] Various concepts, which have been developed in order to explain such effects in turbulent flames, are reviewed elsewhere. 54,55 However, the influences of Le on vorticity ⃗ ω and enstrophy Ω transport are yet to be analysed in detail in the existing literature. In this respect, the main objectives of the present analysis are as follows.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Lewis number on vorticity and enstrophy transport in turbulent premixed flames

2016

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The effects of Lewis number Le on both vorticity and enstrophy transport within the flame brush have been analysed using direct numerical simulation data of freely propagating statistically planar turbulent premixed flames, representing the thin reaction zone regime of premixed turbulent combustion. In the simulations, Le was ranged from 0.34 to 1.2 by keeping the laminar flame speed, thermal thickness, Damköhler, Karlovitz, and Reynolds numbers unchanged. The enstrophy has been shown to decay significantly from the unburned to the burned gas side of the flame brush in the Le ≈ 1.0 flames. However, a considerable amount of enstrophy generation within the flame brush has been observed for the Le = 0.34 case and a similar qualitative behaviour has been observed in a much smaller extent for the Le = 0.6 case. The vorticity components have been shown to exhibit anisotropic behaviour within the flame brush, and the extent of anisotropy increases with decreasing Le. The baroclinic torque term has been shown to be principally responsible for this anisotropic behaviour. The vortex stretching and viscous dissipation terms have been found to be the leading order contributors to the enstrophy transport for all cases, but the baroclinic torque and the sink term due to dilatation play increasingly important role for flames with decreasing Le. Furthermore, the correlation between the fluctuations of enstrophy and dilatation rate has been shown to play an important role in determining the material derivative of enstrophy based on the mean flow in the case of a low Le.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Lewis number on vorticity and enstrophy transport in turbulent premixed flames

2016

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“…In addition to the laminar burning velocity, flame stretch/species diffusion effects have been recognised as having a strong influence in premixed turbulent flames [23].…”

Section: Resultsmentioning

confidence: 99%

Turbulent burning rates of methane and methane–hydrogen mixtures

Fairweather

Ormsby

Sheppard

et al. 2009

Combustion and Flame

100

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“…While the bending effect is well documented in experiments with premixed turbulent flames, as reviewed elsewhere [56,72], explanation and modeling of this effect is still the grand challenge to the combustion community.…”

Section: B Bending Effectmentioning

confidence: 99%

Direct numerical simulation study of statistically stationary propagation of a reaction wave in homogeneous turbulence

Lipatnikov

2017

Phys. Rev. E

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A three-dimensional (3D) direct numerical simulation (DNS) study of the propagation of a reaction wave in forced, constant-density, statistically stationary, homogeneous, isotropic turbulence is performed by solving Navier-Stokes and reaction-diffusion equations at various (from 0.5 to 10) ratios of the rms turbulent velocity U to the laminar wave speed, various (from 2.1 to 12.5) ratios of an integral length scale of the turbulence to the laminar wave thickness, and two Zeldovich numbers Ze = 6.0 and 17.1. Accordingly, the Damköhler and Karlovitz numbers are varied from 0.2 to 25.1 and from 0.4 to 36.2, respectively. Contrary to an earlier DNS study of self-propagation of an infinitely thin front in statistically the same turbulence, the bending of dependencies of the mean wave speed on U is simulated in the case of a nonzero thickness of the local reaction wave. The bending effect is argued to be controlled by inefficiency of the smallest scale turbulent eddies in wrinkling the reaction-zone surface, because such small-scale wrinkles are rapidly smoothed out by molecular transport within the local reaction wave.

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Molecular transport effects on turbulent flame propagation and structure

Cited by 303 publications

References 450 publications

Effects of Lewis number on vorticity and enstrophy transport in turbulent premixed flames

Effects of Lewis number on vorticity and enstrophy transport in turbulent premixed flames

Turbulent burning rates of methane and methane–hydrogen mixtures

Direct numerical simulation study of statistically stationary propagation of a reaction wave in homogeneous turbulence

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