The Fundamental Investigation on the Mechanism of the Liguid Fuel Spray Diffusion Flame : 2nd Report, The Mechanism of the Oscillatory Combustion Occurring in such a Flame

Abstract

This paper deals with the oscillatory combustion occurring in the diffusion flame of liquid fuel spray burning. Main results obtained are as follows. (1) Major part of the fuel burns as the droplet flames. Most of these droplets burn penetrating the surrounding gas and with the flame type of a wake flame. (2) Fluctuation of burning rate that is the driving force of oscillation is brought about by the transition phenomenon of the flame type of droplets. From the above result, the magnitude of the pressure fluctuation can be correlated with the burning condition by using a parameter f. (3) Dependency of the frequency on the combustor length agrees well with the prediction obtained in 1st Report and the dependency of that on the burning condition can be explained quantitatively by examining the relation between the burning condition and the parameters |B| and ∈ which are the synthetic parameters representing the burning condition.