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The present work investigates forced ignition and oscillating propagation ofspray flame in a mixture of fine ethanol droplets and air. Eulerian-Eulerianmethod with two-way coupling is used and detailed chemical mechanism isconsidered. Different droplet diameters and liquid fuel equivalence ratios (ER)are studied. The evaporation completion front (ECF) is defined to study theinteractions between the evaporation zone and flame front. The gas compositionat the flame front is quantified through an effective ER. The results show thatthe kernel trajectory is considerably affected by droplet size and liquid ER.Generally, the flame ER reaches the maximum when the ECF start to move from thespherical center. It gradually decreases and reaches a constant value when theflame freely propagates. Quasi-stationary spherical flame is observed when theliquid ER is low, whilst kernel extinction/re-ignition appears when liquid ERis high. These flame behaviors are essentially affected by the heat conductionand species diffusion timescales between the droplet evaporation zone and flamefront. The dependence of the minimum ignition energy (MIE) on liquid ER isU-shaped and there is an optimal liquid equivalence ratio range (ERo) with thesmallest MIE. Long and short ignition failure modes are observed, respectivelyfor small and large liquid ERs. When liquid ER is less than ERo (long failuremode), larger energy is required to initiate the kernel due to very leancomposition near the spark. For liquid ER larger than ERo (short mode),ignition failure is caused by strong evaporative heat loss and rich gascomposition due to heavy droplet loading.

Forced ignition and oscillating flame propagation in fine ethanol sprays