Species concentrations and turbulence properties in buoyant methane diffusion flames
Past measurements of mean velocities and temperatures in buoyant turbulent, axisymmetric methane diffusion flames burning in still air have been extended to included mean species concentrations (CH/sub 4/, N/sub 2/, O/sub 2/, CO/sub 2/, H/sub 2/O, CO, and H/sub 2/) and turbulence quantitites. The new measurements were used to evaluate a Favre-averaged, k-epsilon-g turbulence model of the process- with all empirical constants fixed by measurements in noncombusting flows. Use of the laminar flamelet method to treat scalar properties yielded reasonably good predictions of mean properties. Turbulence predictions were less satisfactory, generally underestimating fluctuation levels and Reynolds stresses in highly regions of the flows. Measurements indicating significant anisotropy of turbulence properties in the same regions. These findings suggest the need for multistress closure to adequately model turbulence properties in buoyant flames.
- Research Organization:
- Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pa 16802
- OSTI ID:
- 6063409
- Journal Information:
- J. Heat Transfer; (United States), Journal Name: J. Heat Transfer; (United States) Vol. 106:4; ISSN JHTRA
- Country of Publication:
- United States
- Language:
- English
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