- Author
- Zheng, Y. | Sivathanu, Y. R. | Gore, J. P.
- Title
- Measurements and Stochastic Time and Space Series Simulations of Spectral Radiation in a Turbulent Non-Premixed Flame.
- Coporate
- Purdue Univ., West Lafayette, IN Purdue Business & Technology Center, W. Lafayette, IN
- Sponsor
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- Combustion Institute, Symposium (International) on Combustion, 29th. Proceedings. Volume 29. Part 2. July 21-25, 2002, Combustion Institute, Pittsburgh, PA, Sapporo, Japan, Chen, J. H.; Colket, M. D., Editors, 1957-1963 p., 2002
- Keywords
- combustion | turbulent flames | premixed flames | validation | thermal radiation | emissions | equations
- Identifiers
- geometry for thermal radiation measurement and calculation; first measurements of spectral radiation intensities for a flame for which widely used scalar data are available and has also presented a model for the treatment of turbulence radiation interactions that can be coupled with a variety of combustion models; Time and Space Series (TASS) analysis; Turbulent Non-premixed Flames (TNF); Root Mean Square (RMS) spectral radiation intensities
- Abstract
- Experimental data are essential for the validation of radiation submodels, which have been found to be important for predicting pollutant formation in turbulent flames. Instantaneous radiation signals also provide fundamental information about scalar properties in turbulent combustion. Motivated by this, we report measurements of line-of-sight spectral radiation intensities from a non-premixed CH4/H2/N2 turbulent jet flame. The burner and the operating conditions are selected to take advantage of extensive scalar property and velocity measurements available in the literature. At three axial locations in the flame, a fast IR array spectrometer was used to capture the instantaneous radiation intensities for diametric radiation paths. Radiation intensities for the chord-like paths along various radial positions at one of the axial locations were also measured. By using stochastic time and space series (TASS) analysis, the instantaneous emission spectra were also simulated accounting for the turbulence/radiation interactions. In the simulations, the measurements of scalar statistics and mean velocity data were adopted to avoid uncertainties of a combustion model. The calculated mean and root mean square spectral radiation intensities are within 10% of the experimental data. Since the calculated root mean square values are strongly dependent on the integral length scales used in the TASS, these scales were estimated by fitting the calculation to the data. A tomography-like technique was also adopted to simulate the radiation intensities for chord-like paths from the flame edge to the center to examine the radial variation of the integral length scale. The results show factors of 3 variations in the integral length scale that have been ignored in the past work.