Accession Number:

ADA172934

Title:

Application of Rayleigh Scattering to Turbulent Flow with Heat Transfer and Combustion.

Descriptive Note:

Final rept. 1 May 85-30 Apr 86,

Corporate Author:

CALIFORNIA UNIV BERKELEY DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

• Talbot,L.

Report Date:

1986-06-09

Pagination or Media Count:

10.0

Abstract:

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.

Descriptors:

• *TURBULENCE
• *FLAMES
• DENSITY
• LASER BEAMS
• PROBABILITY DENSITY FUNCTIONS
• RAYLEIGH SCATTERING
• SHEETS
• MIXING
• COVARIANCE

Subject Categories:

• Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE