Flame Turbulence Measurements by the Method of Helium Diffusion

Abstract

A technique is described for measuring transverse turbulence intensity in flames which makes use of the diffusion of helium. The latter is detected by a thermal conductivity method. The effects of various experimental parameters and the reliability of the technique are discussed. Results obtained in highly turbulent flames stabilized on various baffles in a 5 cm×20 cm duct are given, and compared with results obtained under comparable cold flow conditions. It appears that, under the conditions of these experiments, the amount of ``flame‐generated'' turbulence detectable at a fixed point in the duct by this technique is probably small.