This work considers the applicability of different versions of the k-e hypothesis of turbulence for flame modeling. Utilizing similarity solutions, we find that the k-e hypothesis gives a finite radius for a weak axysimmetric plume above the heat source. The radius of this plume is defined as an eig
A flame-zone model for turbulent hydrocarbon diffusion flames
β Scribed by H.E. Eickhoff; K. Grethe
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 428 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0010-2180
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β¦ Synopsis
A flame-zone model for an assumed quasilaminar flame substructure of turbulent diffusion flames, combined with a probability density function (PDF) representation of fuel-atom concentration, was developed and tested for a free-jet natural gas flame. The turbulent mixing has been calculated from a semiempirical approach. The predictions from this model were compared with those of the flame sheet and equilibrium models that lead to larger deviations from measurements. This is due to not considering the intermediate species by the flame-sheet model and overestimating the same by the equilibrium model, respectively.
π SIMILAR VOLUMES
A model has been developed for the composition in diffusion flames. It consists of a flame sheet for the pyrolysis or consumption of fuel on the rich side of sloichiometric. Near stoichiometric the molecular and radical species are assumed to be in partial equilibrium and the burnout of CO is contro
Measurements are presented for a turbulent diffusion flame jet of carbon monoxide in coflowing air. Detailed profiles of average velocity, turbulence intensity, average temperature, and species concentrations were measured at a Reynolds number of 1.14 Γ 104. Several checks on the data indicated good
Liftoff heights of turbulent diffusion flames have been modeled using the laminar diffusion flamelet concept of Peters and Williams [A/ AA J., 21:423-429 (1983)]. The strain rate of the smallest eddies is used as the stretch describing parameter, instead of the more common scalar dissipation rate. T