Propagation of turbulent flames

Scurlock, A.C.; Grover, John H.

doi:10.1016/s0082-0784(53)80085-8

Cited by 67 publications

(33 citation statements)

References 8 publications

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“…Since (1) d t is known to grow in time (Atashkari et al, 1999;Renou et al, 2002) and (2) this quantity was not provided in most of the analyzed experiments, we had to invoke a submodel for d t (t). An analysis of numerous published data on d t , discussed in our recent papers (Lipatnikov andChomiak, 2001, 2002a), supports the classical hypothesis (Karlovitz et al, 1951;Prudnikov, 1964;Scurlock and Grover, 1953) that the development of flame brush thickness in many laboratory flames follows the turbulent diffusion law (Brodkey, 1967;Taylor, 1935) …”

Section: Methodssupporting

confidence: 55%

Application of the Markstein Number Concept to Curved Turbulent Flames

Lipatnikov¹,

Chomiak²

2004

Combustion Science and Technology

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Effects of large-scale stretching of premixed turbulent flames on flame speed are discussed and an extension of the classical Markstein number concept is proposed to parameterize flame speed modifications by the stretch rate. The concept is applied to fit various experimental data on the growth of the radius of expanding, statistically spherical, premixed, turbulent flames, obtained by different groups under different conditions. In all the cases studied, the suggested extension approximates the experimental data very well. It is shown also that this phenomenological approach may be utilized to determine the values of unperturbed turbulent flame speeds, S 0 t , by processing the experimental data for spherical flames. The difference between the obtained values of unperturbed S 0 t and the mean speeds of spherical flames, observed during expansion, may be as large as 200-300%. The strong influence of the perturbations discussed shows that such effects should be properly addressed when analyzing experimental data or invoking a presumed turbulent flame speed in simulations, for example, in large-eddy simulation based on the G-equation approach.

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Section: Methodssupporting

confidence: 55%

Application of the Markstein Number Concept to Curved Turbulent Flames

Lipatnikov¹,

Chomiak²

2004

Combustion Science and Technology

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“…The problem of flame-generated turbulence was posed by Karlovitz et al (1951) and Scurlock & Grover (1953) in order to attribute high values of S t measured in early experiments to an increase in u within flame brushes when compared to u in upstream flows. Karlovitz et al (1951) argued that, because of the random orientation of flame fronts, the local velocity jumps |(u b − u u ) · n| increase the magnitude u = |u −ū|/ √ 3 of velocity fluctuations in products.…”

Section: Flame-generated Turbulence?mentioning

confidence: 99%

“…In other words, Karlovitz et al (1951) associated flame-generated turbulence with flow acceleration by the local pressure drop δp f at flame fronts. Scurlock & Grover (1953) highlighted (a) the creation of transverse shear in the flow of burned products within a flame brush due to uneven axial flow acceleration by the mean pressure gradient ∇p and (b) turbulence generation by the shear flow. Because the acceleration of a fluid particle Du/Dt ∝ ρ −1 ∇p is inversely proportional to its density, the same pressure gradient accelerates low-density products more strongly than heavier unburned gas.…”

Section: Flame-generated Turbulence?mentioning

confidence: 99%

“…The contribution of the local DL instability of flame fronts in turbulent flows to S t was hypothesized a long time ago (e.g., Scurlock & Grover 1953). Both analytical models (Kuznetsov & Sabelnikov 1990, Bychkov 2003) and a closure relation (Paul & Bray 1996) for RANS simulations were developed to allow for this effect.…”

Section: Unburned Mixture Flow Upstream a Flame Frontmentioning

confidence: 99%

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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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“…Conceptually, the simplest way to distort an anchored premixed flame is to introduce some upstream perturbation that can be described as a kinematic process (Scurlock and Grover, 1953;Boyer and Quinard, 1990), but intrinsic flame dynamics can interfere with this process (Clavin, 1985;Searby et al, 1985) to select the structures having the maximum growth rate and to wrinkle the flame front with a characteristic scale (Yoshida, 1986;Hertzberg et al, 1991). There is thus also some interest in laminar flame experiments where these intrinsic properties only are observed.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Induced Instabilities of a V-Shaped Flame Anchored on a Rod

Quinard

1996

Combustion Science and Technology

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Flame deformations in the near wake of an anchoring rod have been studied experimentally using laser tomography and laser anemometry. It is shown that the small scale structures occuring on V-shaped premixed flames are triggered by residual acoustic resonances of the burner when the flame is partly lifted off. This results from a shear layer instability of the wake, enhanced by a shielding effect of the rod on the acoustic field at the exit of the burner. The characterisitic wavelength AjD varies as Re-1/2.

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Propagation of turbulent flames

Cited by 67 publications

References 8 publications

Application of the Markstein Number Concept to Curved Turbulent Flames

Application of the Markstein Number Concept to Curved Turbulent Flames

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

Acoustic Induced Instabilities of a V-Shaped Flame Anchored on a Rod

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