Abstract
/Local fluctuations in temperature and composition in a turbulent flame are examined through their influence on Raman-scatter ing measurements of time-averaged flame properties. Using mean temperatures and number densities measured in a hydrogen diffusion flame, two approaches to investigating turbulence properties are examined. In the first, which is restricted to flame conditions where fluctuations are fairly small, the variation of measured number density with spectral resolution is used to determine values for particular correlations between fluctuations in number density and temperature. In the second approach, the Raman measurements are used to evaluate a particular model for concentration fluctuations. The shifting-equilibrium reaction model is combined with a clipped-Gaussi an probability density function for mixture fraction in order to predict time-averaged Raman signals. Comparisons with the Raman data determine particular radial distributions for the mean mixture fraction and for the intensity of concentration fluctuations. These distributions are then used to predict a variety of averaged flame properties, as well as the errors occurring in the time-averaged Raman measurements.
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