Abstract
Local and instantaneous structures as well as time-averaged characteristics of turburent diffusion flame were discussed by means of simultaneous multipoint measurements and visualization techniques. The turburent macroscale, the apparent flame velocity and the relation between signals of Rayleigh scattering and instantaneous flame structure were discussed. From these analyses, the following results were obtained. 1) The structure of the turburent diffusion flame was categorized into four regions. 2) The four regions defined by this study agreed well with those categorized by the time-scale division of temperature fluctuation. 3) The flame which periodically appeared due to the expansion caused by combustion generated a large roll-up eddy. 4) The flame structure in the mixing region of fuel and air was influenced by the Reynolds number. 5) The surrounding air was introduced into the fuel flow by the tangential eddy motion as well as by the axial and radial motions. 6) Simultaneous multipoint measurements were effective to decide the integral scale.
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