Cross-correlation of velocity and temperature in a premixed turbulent flame

Tanaka, Hidenori; Yanagi, Tetsui

doi:10.1016/0010-2180(83)90097-4

Cited by 26 publications

(3 citation statements)

References 3 publications

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“…Our values are similar to those of Tanaka & Yanagi (1983) in a bunsen-type premixed flame and are comparable with the results of Driscoll, Schefer k Dibble (1982) obtained in a non-premixed flame.…”

Section: Turbulent Heat $Uxsupporting

confidence: 91%

“…The axial heat flux is directed towards the baffle, for r / D < 0.5, and is therefore directed against the sign of the axial gradient of mean temperature. Similar behaviour has been observed in other turbulent premixed flames (e.g Moss 1980;Shepherd & Moss 1981;Shepherd et al 1982;and Tanaka & Yanagi 1983). and has also been predicted analytically(Bray et d. 1981 ; Masuya & Libby 1981).…”

supporting

confidence: 85%

“…P. Taylor and J . Contours of turbulent heat transfer rate : (a) axial heat flux (lOOO&~/V,) : shaded regions show areas of non-gradient axial transport where the sign of the heat flux is the same as that of the mean temperature gradient; ( b ) radial heat flux (lOOOv~/Uo).premixed flame ofTanaka & Yanagi (1983). It should be recalled that it is the spatial gradients of the heat-flux components, and not the components themselves, that give rise to heat transport.…”

mentioning

confidence: 99%

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The interaction of turbulence and pressure gradients in a baffle-stabilized premixed flame

1987

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Simultaneous measurements of time-resolved velocity and temperature have been obtained by laser-Doppler anemometry and numerically compensated fine-wire thermocouples in the near wake of a premixed flame stabilized on a disk baffle located on the axis, and at the exit, of a confining pipe. The diameter of the disk was 0.056 m, the diameter of the pipe was 0.080 m, the volumetric equivalence ratio with natural gas as the fuel was 0.79 and the Reynolds number, based on pipe diameter and upstream pipe bulk velocity of 9 m/s, was 46 800. The purpose of the measurements is to quantify the relative magnitudes of terms involving the mean pressure gradient and Reynolds stresses in the balance of turbulent kinetic energy and heat flux in a strongly sheared, high-Reynolds-number, reacting flow. The latter term has been associated with non-gradient diffusion in other flows. Source terms involving the mean pressure gradient are large in the conservation of turbulent heat flux but not in the conservation of Reynolds stress. The ‘thin-flame’ model of burning suggests that the sign and magnitude of the heat flux is closely related to the conditioned mean velocities. The mean axial velocity of the reactants is larger (by up to 0.27 of the reference velocity) than that of the products on the low-velocity side of the shear layer that surrounds the recirculation bubble but the reverse is true on the high-velocity side. These observations are related to the sign of the axial pressure gradient, which is associated with the streamline curvature, and the consequent preferential acceleration of the low-density products. Generally, the Reynolds stresses of the products are higher than those of the reactants and, in contrast to previously reported measurements, the contribution to the unconditioned stresses by the difference in the mean velocity between products and reactants, the so-called ‘intermittent’ contribution, is small. This is a consequence of the high Reynolds number of our flow.

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Section: Turbulent Heat $Uxsupporting

confidence: 91%

supporting

confidence: 85%

mentioning

confidence: 99%

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The interaction of turbulence and pressure gradients in a baffle-stabilized premixed flame

1987

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Moderne Entwicklungen bei der Untersuchung von Verbrennungsvorgängen

Just¹

1983

Ber Bunsenges Phys Chem

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Starker gekrummte Flammenfronten, d. h. rnit Krummungsradien, die in die GroBenordnung der Flarnmenzonendicke fallen, spielen u. a. in vielen technisch wichtigen Anwendungen eine Rolle. Nichtebene Flammenfronten konnen ausgeprlgt instationares Verhalten zeigen. StOrungen im anstromenden Gas kannen rnit der Flammenfront wechselwirken und zu besonderen Flammenoberfllchenformen fuhren, fur die in Abb. 6 und 7*) zwei Beispiele gegeben werden. Eine umfassende theoretische Beschreibung der beobachteten zahlreichen Instabilitltsformen steht noch aus, da sich die Diskussion der diese Phanomene beschreibenden, nichtlinearen Differential-bzw. Integralgleichungen als schwierig erweist. Fortschritte iiber die einfachen, linearisierten Ansatze verschiedener Autoren [7] sind in jiingerer Zeit von Sivashinski (81 et al. sowie von Clavin [9] et al. erzielt worden. *) Siehe Seite 972. Ber. Bunsenges. Phys. Chem. 87, 968-979 (1983) -0 Verlag Chemie GmbH, D-6940 Weinheim, 1983.

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Modelling the Effects of Combustion on a Premixed Turbulent Flow : A Review

Champion

1989

Lecture Notes in Engineering

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Cross-correlation of velocity and temperature in a premixed turbulent flame

Cited by 26 publications

References 3 publications

The interaction of turbulence and pressure gradients in a baffle-stabilized premixed flame

The interaction of turbulence and pressure gradients in a baffle-stabilized premixed flame

Moderne Entwicklungen bei der Untersuchung von Verbrennungsvorgängen

Modelling the Effects of Combustion on a Premixed Turbulent Flow : A Review

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