Prediction of ignition modes of NTC-fuel/air mixtures with temperature and concentration fluctuations

The ignition regime criteria proposed by Im et al. (2015) are extended to account for temperature and concentration fluctuations. The newly-developed criteria are applied to negative temperature coefficient (NTC) and non-NTC fuels. The statistical volume-averaged Sankaran number, S¯a, and the volumetric fraction of Sa < 1, FSa,S, are proposed as new metrics to determine a priori the combustion modes, combustion intensity, and ignition delay...