Turbulent kinetic energy analyses of hydrogen-air diffusion flames

Rhodes, Russel E.; Harsha, P. T.; Peters, C.

doi:10.1016/0094-5765(74)90109-x

Cited by 42 publications

(8 citation statements)

References 7 publications

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“…The latter two models predict almost no overlap in these profiles, consistent with the classic "flame sheet" assumption. Similar results were obtained by Rhodes et al (1974) using their "fluctuating" model (as shown in Figure 9). …”

Section: Scaling Buoyant Flame Propertiessupporting

confidence: 87%

“…No firm conclusions can be reached from the results shown in Figures 8a and 8b regarding the relative advantages of these models. The present theory, using a mixing length eddy viscosity model with nonequilibrium chemistry, agrees with these data at least as well as the theories of Rhodes et al (1974). Figure 9, however, shows that the "fluctuating" model of Rhodes et al (1974) does a better job of accounting for the radial species mole fraction profiles than the present model at xjr, = 160.…”

Section: Scaling Buoyant Flame Propertiessupporting

confidence: 78%

“…The present theory, using a mixing length eddy viscosity model with nonequilibrium chemistry, agrees with these data at least as well as the theories of Rhodes et al (1974). Figure 9, however, shows that the "fluctuating" model of Rhodes et al (1974) does a better job of accounting for the radial species mole fraction profiles than the present model at xjr, = 160. At xjr, = 320, however, (not shown in this paper) the "fluctuating" model does not agree with the data as well as the "steady" model.…”

Section: Scaling Buoyant Flame Propertiessupporting

confidence: 78%

“…3) Calculations by Rhodes et al (1974), using a one equation TKE turbulence model and Fishburne et al (1977) As expected from the axial temperatures and mole fractions shown in Figures 4 and 5, the predictions bracket the data. These lengths are, of course, greater than those for diffusion flames with zero external (air) velocity.…”

Section: Buoyant Flame Calculationsmentioning

confidence: 60%

“…Again, the predictions for PI' = 0.7 and 1.0 bracket the data. Rhodes et al (1974) and the data. Their calculations are based on an integral (rather than finite-difference) method for solving the differential equations and assume equilibrium chemistry.…”

Section: Scaling Buoyant Flame Propertiesmentioning

confidence: 99%

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Influence of Buoyancy on Turbulent Hydrogen/Air Diffusion Flames

Pergament¹,

Fishburne²

1978

Combustion Science and Technology

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s-A model which treats the axisymmetric turbulent mixing of co-flowing streams, including nonequilibrium chemistry, is applied to the prediction of buoyant Hs/air diffusion flame properties. The model, which employs the Donaldson/Gray eddy viscosity formulation, is first tested against the nonbuoyant laboratory H2/air flame data of Kent and Bilger. It is shown that centerline temperatures and species mole fractions can be predicted to good accuracy. However, the calculated rate of radial transport of energy and mass is greater than that measured in the laboratory experiments. The results of a series of parametric calculations on buoyant flames and comparisons with buoyant flame length data show that: (I) flame properties scale with nondimensional distance for Froude numbers (Fr) greater than about 10', (2) buoyancy significantly affects temperature decay rates downstream of the location of maximum temperature (after all the H2 has burned), and (3) the predicted influence of Fr on buoyant flame lengths is consistent with the available data. FLAME

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Section: Scaling Buoyant Flame Propertiessupporting

confidence: 87%

Section: Scaling Buoyant Flame Propertiessupporting

confidence: 78%