Abstract
A refined analysis of the combustion process in a turbulent diffusion flame requires knowledge of at least three aspects of the concentration field of nozzle fluid: the mean concentration, the concentration-fluctuation intensity, and the intermittency factor. The last is defined as the probability of finding nozzle fluid at a point, and was the subject of this investigation. A cold model was used in which nozzle air, marked with an oilfog, discharged into clear air at the same temperature. The scattered-light technique was utilized for concentration detection. Both free and ducted round, turbulent jets were studied. With the latter, emphasis was on the regime in which recirculation occurs. The mechanism of recirculation was considerably illuminated by the results. The complement of the intermittency factor is interpreted as the probability distribution function of, for example, the lateral location of the jet boundary in zones without recirculation. Thus, it was possible to determine the statistical properties of the jet boundary, and also of the upstream edge of the recirculation eddy.
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