Simultaneous Multipoint Temperature Measurements by Laser Rayleigh Scattering in Turbulent Diffusion Flames

Abstract

The instantaneous spatial temperature profile is measured by the laser Rayleigh scattering method using a detector which has 512 photodiode elements in a single line. The detector was applied to two typical turbulent diffusion flames with different degrees of turbulence. The results obtained are as follows. (1) A comparatively large-scale temperature fluctuation dominates the temperature fluctuation intensity in turbulent diffusion flames. (2) The average and instantaneous maximum temperature tends to decrease when the Reynolds number increases ; consequently the turbulence tends to increase.