- Author
-
Jeng, S. M.
|
Chen, L. D.
|
Faeth, G. M.
- Title
- Investigation of Axisymmeytric Buoyant Turbulent Diffusion Flames.
- Coporate
- Pennsylvania State Univ., University Park
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
- Report
-
NBS GCR 82-367,
January 1982,
88 p.
- Distribution
- Available from National Technical Information Service
- Contract
- GRANT-7-9020
- Keywords
-
buoyancy
|
diffusion flames
|
flame research
|
heat flux
|
methane
|
transport equation
- Abstract
- This investigation considered measurements of the structure of axisymmetric, buoyant, turbulent diffusion flames in still air. Profiles of mean temperature, man velocity, velocity fluctuations and total radiant heat flux were completed for methan flames, including careful characterization of burner exit conditions, in order to provide data for the evaluation of models of the process. Preliminary tests also provided mean temperature profiles for propane flames. Test conditions were chosen so that the flow was turbulent near the burner exit while effects of buoyancy were significant over most of the luminous portion of the flames. Both the present measurements and those of other investigators were compared with predictions of a k-epsilon-g differential model, which included effects of buoyancy in the transport equations for turbulence quantities. The results indicated anisotropic effects in regions where buoyancy dominates flow properties suggesting the eventual desirability of multi-stress models for buoyant flames, although extensive recalibration of model constants from a limited data based would be required if this step were taken. Additional measurements and analysis of methane flames are in progress, in order to investigate the flame radiation properties and provide additional data on turbulence properties needed for model development.