- Author
-
Fang, J. B.
- Title
- Analysis of the Behavior of a Freely Burning Fire in a Quiescent Atmosphere. Interim Report.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Sponsor
- Department of Housing and Urban Development, Washington, DC
- Report
-
NBSIR 73-115,
February 1973,
61 p.
- Distribution
- AVAILABLE FROM National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161. Telephone: 1-800-553-6847 or 703-605-6000; Fax: 703-605-6900. Website: http://www.ntis.gov
- Keywords
-
diffusion flames
|
mathematical models
|
turbulent flow
|
free burning fires
|
quiescent atmospheres
- Abstract
- A mathematical model which describes the physical and geometrical properties of a turbulent buoyant diffusion flame over a free burning fire has been set up for both axisymmetric and two dimensional cases. The mathematical simulation of the flame consists of a combustion zone near its source and a buoyant plume above and has been developed based on the assumptions of infinitely rapid rate of oxygen limited combustion reaction and "top hat" profiles representing vertical distributions of the velocity, temperature, and concentration of the flame gas. Analytical solutions are presented showing the effects of fuel mass-flow rate, physical properties of the fuel and ambient air, and the size and shape of burning area on the general characteristics of a buoyant flame. Experimental data on visable flame heights and flame temperature profiles obtained from burning several different fuels have been satisfactorily correlated by the derived expressions.