Abstract
A spray diffusion flame that results from an evaporating multisize (polydisperse) spray of fuel droplets suspended in one of the streams of a unidirectional shear-layer flow is analyzed. The droplets and their vapors spread into a coflowing stream, in which the oxidizer is contained, and feed the flame. Similarity solutions are presented for the evolution in droplet-size distributions across the shear layer, and the effects of various drop-size distributions on the fuel-vapor concentrations and on flame geometry and temperature are examined. The lateral location of the flame is obtained here via the solution of Schvab-Zeldovich type equations. The present results indicate that (1) sprays that contain mainly large droplets produce smaller amounts of vapor and thus result in a cooler flame that is located closer to the spray stream, and (2) sprays of different initial drop-size histograms, but of similar Sauter mean diameter (SMD) values may (under certain operating conditions) form flames of similar shapes.
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