- Author
- Kounalakis, M. E. | Gore, J. P. | Faeth, G. M.
- Title
- Mean and Fluctuating Radiation Properties of Nonpremixed Turbulent Carbon Monoxide/Air Flames.
- Coporate
- Michigan Univ., Ann Arbor
- Journal
- Journal of Heat Transfer, Vol. 111, 1021-1030, November 1989
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
- Contract
- NBS-GRANT-60NANB5D0576
- Keywords
- carbon monoxide | turbulence | density effects
- Identifiers
- temporal power spectral densities; mean and fluctuating values; spectra radiation intensities; horizontal chord-like paths; probability density functions
- Abstract
- Mean and fluctuating spectral radiation intensities were measured for horizontal chord-like paths (before, near and after the flame tip) through several nonpremixed turbulent carbon monoxide/air flames. Measurements in the strong 2700 nm radiation band of carbon dioxide revealed strong effects of turbulence/radiation interactions, with radiation fluctuation intensities in excess of 50 percent at some locations. A stochastic simulation approach was developed to treat the temporal properties of flame radiation; based on the laminar flamelet concept to relate scalar properties to the mixture fraction, statistical time-series techniques to treat temporal and spatial correlations of mixture fraction along a radiation path, and a narrow-band radiation model. The stochastic simulations yielded encouraging predictions of mean and fluctuating values, probability density functions, and temporal power spectra of spectral radiation intensities.