Flame-Turbulence Interactions in a Freely-Propagating, Premixed Flame

Videto, Brian; Santavicca, D. A.

doi:10.1080/00102209008951611

Cited by 39 publications

(18 citation statements)

References 18 publications

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“…Such an influence of thermal expansion on some components of the tensor (u i u j ) u was documented in a few earlier experimental studies. In particular, Videto & Santavicca (1990) reported a gradual increase in u measured ahead of a mean flame brush as the flame approached the measurement point, with the local velocity spectrum changed at large wave numbers. Furukawa et al (2002) documented larger u u in flames than in the counterpart cold flows.…”

Section: Unburned Mixture Flow Upstream a Flame Frontmentioning

confidence: 96%

Recent Advances in Understanding of Thermal Expansion Effects in Premixed Turbulent Flames

Sabelnikov

Lipatnikov

2017

Annu. Rev. Fluid Mech.

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When a premixed flame propagates in a turbulent flow, not only does turbulence affect the burning rate (e.g., by wrinkling the flame and increasing its surface area), but also the heat release in the flame perturbs the pressure field, and these pressure perturbations affect the turbulent flow and scalar transport. For instance, the latter effects manifest themselves in the so-called countergradient turbulent scalar flux, which has been documented in various flames and has challenged the combustion community for approximately 35 years. Over the past decade, substantial progress has been made in investigating (a) the influence of thermal expansion in a premixed flame on the turbulent flow and turbulent scalar transport within the flame brush, as well as (b) the feedback influence of countergradient scalar transport on the turbulent burning rate. The present article reviews recent developments in this field and outlines issues to be solved in future research.

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Section: Unburned Mixture Flow Upstream a Flame Frontmentioning

confidence: 96%

Recent Advances in Understanding of Thermal Expansion Effects in Premixed Turbulent Flames

Sabelnikov

Lipatnikov

2017

Annu. Rev. Fluid Mech.

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“…Most of the published experimental work on turbulent premixed reacting flows considers stabilized flames such as V-shaped or conical flames, with a simple variation of the turbulence and equivalence ratio [Deschamps et ai, 1996;Nye et al, 1996]. These experimental configurations resumed by Videto and Santavicca (1990) present several drawbacks primarily associated with flame stabilization mechanisms. To eliminate such drawbacks, several freely-propagating flame configurations have been developed to study the fundamental flame-turbulence coupling.…”

Section: B Renou and A Boukhalfamentioning

confidence: 97%

“…To eliminate such drawbacks, several freely-propagating flame configurations have been developed to study the fundamental flame-turbulence coupling. The geometrical properties such as flame surface, laminar flame speed, mean flame stretch, curvatures of the flame front can be determined either by high-speed schlieren cine photography [Kwon et al, 1992;Gu et al, 2000] or by laser sheet tomography [Videto and Santavicca, 1990;Wu et al, 199I;Lee et al, 1993;Mueller et al, 1998]. Experiments with flame kernels expanding in the premixed gases are also used to study the coupling phenomena between combustion and turbulence in fan-stirred bombs [Abdel-Gayed et al, 1987;Bradley et al, 1996b;Lecordier, 1997;Lawes et aI., 1998] or in grid-generated decaying turbulence open flow .…”

Section: B Renou and A Boukhalfamentioning

confidence: 99%

An Experimental Study of Freely Propagating Premixed Flames at Various Lewis Numbers

Renou

Boukhalfa

2001

Combustion Science and Technology

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Several freely-propagating premixed turbulent flames are experimentally obtained in a decaying isotropic turbulent flow for various Lewis numbers. The high speed laser sheet tomography technique is applied to visualize the temporal evolution of the spatial properties of the flame fronts and to study the influence of the Lewis number (Le) on the flame front structures at fixed u' /S~. This experimental study is also performed to highlight the transient effect over time of the flame front geometry of turbulent premixed flames under varying turbulence conditions and fuel/air mixtures.From the tomographic recordings, the flame surface properties and mean radii are calculated at each stage of flame development and allow the mean global stretch and the mean burning velocity at each step of the flame propagation to be determined. As expected from asymptotic theory, the effects of preferential-diffusion/stretch interactions for low turbulent conditions can be modeled according to a linear correlation. For Le-l, the mean burning velocity decreases slightly with the mean flame stretch. and the Markstein lengths are independent of the turbulent conditions. For Le-I.6 and Le-O.3, the mean burning velocity evolution with mean stretch shows an opposite trend both for laminar and turbulent flames. The linear dependence between and predicted for weak stretch in laminar flames appears to be valid for turbulent premixed flames, except for highly turbulent hydrogen/air flames u' /S~= 1.89. For small values of Lewis numbers nnd/or high values of u' /S~l the weakly stretched approach associated with the asymptotic theory is insufficient for modeling premixed turbulent combustion.

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“…(Although in some flame configurations this limit can be extended somewhat with an auxiliary device; for instance a rim stabilized flame may be further anchored by including a pilot flame). A secondary liability of these experiments is associated with the flame stabilization itself, as discussed in a previous paper (Videto and Santavicca, 1990). In short, there is reason to believe that the stabilization alters the flame structure, which fundamentally influences the turulence effects on the flame.…”

Section: Introductionmentioning

confidence: 97%