- Author
-
Grosshandler, W. L.
- Title
- RADCAL: A Narrow-Band Model for Radiation Calculations in a Combustion Environment.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Report
-
NIST TN 1402,
April 1993,
52 p.
- Distribution
- AVAILABLE FROM Government Printing Office, Washington, DC 20401-0003. Telephone: 202-512-1800. Website: http://www.gpo.gov 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
-
models
|
radiation
|
combustion
|
radiative heat transfer
|
spectra
|
spectral absorptivity
|
spectral emissivity
- Abstract
- Radiation within a medium containing products of combustion is dependent upon the temperature and concentrations throughout the entire field. The energy is distributed across the infrared spectrum in a highly nonlinear fashion, which greatly complicates modeling of the heat transfer within a burning environment. This report describes a numerical program, RADCAL, which predicts the radiant intensity leaving a nonisothermal volume containing nonuniform levels of carbon dioxide, water vapor, methane, carbon monoxide, nitrogen, oxygen, and soot. The absorption coefficient of the combined gases is calculated from a narrow-band model and a combination of tabulated spectral properties and theoretical approximations to the vibrational-rotational molecular bands. Soot is treated as a purely absorbing substance in the Rayleigh limit. Background on the development of the model, example calculations, and an explanation of input procedures are presented.