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Application of Rayleigh Scattering to Turbulent Flow with Heat Transfer and Combustion.
Final rept. 1 May 85-30 Apr 86,
CALIFORNIA UNIV BERKELEY DEPT OF MECHANICAL ENGINEERING
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Studies of premixed turbulent v-shaped flames have been carried out using two-point Rayleigh scattering. Density fluctuation intensities, two-point density covariances, and mean density profiles were found to be in good agreement with a wrinkled laminar flame model which is an extension of the Bray-Moss-Libby model. The probability density function for the location of the flame brush was measured and found to have a self-similar behavior when scaled with the maximum slope thickness. A new optical technique was developed to make time-resolved Rayleigh scattering measurements along a length of a laser beam, thus extending the two-point technique to a multipoint one. The technique has been applied to the investigation of the dynamics of v-shaped premixed turbulent flames. Some of the findings are that incident turbulence controls flame motion in the frequency range 100-100 Hz, and that an increase in heat release for a given incident turbulence intensity increases the amplitude of the flame fluctuations without modifying their spectral characteristics.
APPROVED FOR PUBLIC RELEASE