A mathematical model is formulated to describe the fluctuations of spray diffusion flames brought on by fuel feed unsteadiness and spatial nonuniformity. The spray is modelled using the sectional approach. An analytic solution is developed and utilized for computing the dynamics of the flame envelope under various operating conditions, such as liquid fuel volatility and droplet size, expressed through a vaporization Damkohler number. Calculated data reveal the way in which the underlying alternate waves of liquid and gaseous fuel lead to flame growth, collapse and distortion. This behaviour influences the temperature field temporally and spatially, and produces regions that are periodically hotter and colder. The ramifications of these results on combustion efficiency and pollutant production are discussed.

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