Direct numerical simulations of spray spark ignition
Type
Change log
Authors
Abstract
Direct Numerical Simulations (DNS) of a mono-disperse spray in a turbulent flow have been used to explore the nature of flame kernels when a spark is deposited in the spray. The simulations use complicated chemistry and are done with the code SENGA2, which has been used for a variety of other turbulent flame problems. For details, see: (i) A. Neophytou's PhD thesis; (ii) Neophytou, A, Mastorakos, E. and Cant, R. S. (2010) DNS of spark ignition and edge flame propagation in turbulent droplet-laden mixing layers. Combustion and Flame 157, 1071-1086. doi:10.1016/j.combustflame.2010.01.019; (iii) Neophytou, A., Mastorakos, E. and Cant, R.S. (2011) Complex chemistry simulations of spark ignition in turbulent sprays. Proceedings of the Combustion Institute 33, 2135-2142. doi:10.1016/j.proci.2010.06.022 ; (iv) Neophytou, A., Mastorakos, E. and Cant, R.S. (2012) The internal structure of igniting turbulent sprays as revealed by complex chemistry DNS. Combustion and Flame 159, 641-664. doi: 10.1016/j.combustflame.2011.08.024.
Description
The animations show: (i) black regions correspond to stoichiometric mixture, essentially revealing droplet locations. (ii) blue surfaces denote endothermic reaction zones, while (iii) green and red surfaces denote progressively higher exothermic reaction zones. (iv) The gray surface is the region where the temperature equals 1400 K, to denote the spreading of the energy deposited by the spark.