The Coherent Flame Model for Turbulent Chemical Reactions

Marble, Frank E.; Broadwell, James E.

doi:10.21236/ada036768

Cited by 211 publications

(106 citation statements)

References 1 publication

Supporting

Mentioning

104

Contrasting

Unclassified

Order By: Relevance

“…It will be recognized that the present analysis has elements in common with the coherent flame-sheet model described in Marble & Broadwell (1977) -principally that a portion of the reaction takes place in strained laminar flames. It differs in two basic ways.…”

Section: Discussion Of Related Studiesmentioning

confidence: 99%

“…that the structure is quasi-steady and that the zones may be considered plane, then the analysis of Marble (described e.g. in Marble & Broadwell 1977) is applicable. The distributions of A and B (still considered to be inert) within the zones are in which y is the coordinate normal to the zone, 6 is the local strain rate, and (co) denotes conditions far from the layer.…”

Section: The Modelmentioning

confidence: 99%

See 1 more Smart Citation

A simple model of mixing and chemical reaction in a turbulent shear layer

1982

View full text Add to dashboard Cite

Arguments are presented to show that the concept of gradient diffusion is inapplicable to mixing in turbulent shear layers. A new model is proposed for treating molecular mixing and chemical reaction in such flows a t high Reynolds number. It is based upon the experimental observations that revealed the presence of coherent structures and that showed that fluid elements from the two streams are distributed unmixed throughout the layer by large-scale inviscid motions. The model incorporates features of the strained flame model and makes use of the Kolmogorov cascade in scales. Several model predictions differ markedly from those of diffusion models and suggest experiments for testing the two approaches.

show abstract

Section: Discussion Of Related Studiesmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 99%

A simple model of mixing and chemical reaction in a turbulent shear layer

1982

View full text Add to dashboard Cite

show abstract

“…In the case of an excess of reactant A, however, Marble & Broadwell (1977) show that the surface moves to the right (see figure 18) with respect to the fluid a t a speed 9 * f-1 f + l ' v(t) = a (7) , where erf a = -For f 2 10, v(t) N ( 9 / t ) * . Product is formed at the reaction surface and tencls to be left behind in a region of increasing reactant A as the surface moves to the right.…”

Section: Appendixmentioning

confidence: 98%

“…In this global sense, the product labels the vorticity for an isolated sheet, regardless of Schmidt number. If the sheet is not isolated, 'flame shortening' (Marble & Broadwell 1977) and the analogous 'vortex sheet shortening' effects can alter the ratio (P/S)local. And, if the flow is three-dimensional, vortex stretching will amplify and rotate the vorticity vector.…”

Section: Dtmentioning

confidence: 99%

Structure in turbulent mixing layers and wakes using a chemical reaction

1981

View full text Add to dashboard Cite

Plane turbulent mixing between two streams of water which contained dilute chemical reactants was studied in anew blow-down water tunnel. In a diffusion-limited reaction, a pH indicator, phenolphthalein, in one stream mixed and reacted with a baae, sodium hydroxide, in the other stream to form a visible reaction product. The product was found to exist, as expected, in concentrated regions associated with the large, @an-wise-coherent structures of the turbulence. A transition in the mixing was observed in which the aqueous mixing product increased by an order of magnitude. The transition is a consequence of the appearance and development of small-scale threedimensional motions in the flow. Downstream of the transition, the amount of mixing product was independent of Reynolds number (for an order-of-magnitude increase in the latter) and at most only weakly dependent on Schmidt number.

show abstract

“…A problem in some EBU models is associated to a near wall poor performance when simulating complex reactive flows. For this reason Marble and Broadwell (1977) developed a flamelet model for tubulent flow with laminar flames that grow according to the flame front distortions and the wall distance, with transport equations for the progress variable and flame area. This area, the flame area density Σ, is given per unit of volume and the model formulation is a little bit different from the EBU ones.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the b-Ξ Flame Wrinkling Combustion Model in ORACLES Test Rig

Santos

Dourado

2015

J.Aerosp. Technol. Manag.

View full text Add to dashboard Cite

Numerical modeling of premixed combustion is important for a wide range of machines and systems focusing on compliance with the increasing pollutants reduction requirements. However good industrial numerical combustion models need a practical requiring, in this way, a balance between speed and accuracy. The flamelet models are suitable for this purpose providing a decoupling of the reactive and fluid dynamic problems, and an important model of this family is the b-Ξ flame surface wrinkling model. A specially challenging experiment to test this combustion model is the ORACLES test rig whose two independent parallel inlet channels consistently influence the turbulent combustion, injecting fuel and oxydizer at different equivalence ratios. The b-Ξ flamelet combustion model is known by the sensibility to numerical schemes and boundary conditions and, based on this, the present study proposes to investigate the coupling with the important SST k-ω turbulence model and achieve good balance among accuracy, boundedness, stability and efficiency using the ORACLES experiment.

show abstract

The Coherent Flame Model for Turbulent Chemical Reactions

Cited by 211 publications

References 1 publication

A simple model of mixing and chemical reaction in a turbulent shear layer

A simple model of mixing and chemical reaction in a turbulent shear layer

Structure in turbulent mixing layers and wakes using a chemical reaction

Numerical Study of the b-Ξ Flame Wrinkling Combustion Model in ORACLES Test Rig

Contact Info

Product

Resources

About