Abstract
A numerical study for self-ignition of single fuel droplet (n-heptane) in a high-temperature environment was performed in this article. The numerical simulations include detailed chemistry in terms of a set of elementary reactions using up to 256 elementary reactions, as well as a multispecies transport model. The ignition time was compared to the experimental results and it was shown that both were found to be in good agreement. Further, the computed results (temperature distribution, ignition time, heat release rate and so on) were compared with the results which were obtained under assumption of single-step reaction model and the validity of single-step reaction model for ignition process was examined. It was calculated that the single-step reaction model does not give appropriate results for ignition time and initial heat release distributions. In case of a small droplet, heat release rate in early time becomes much larger than that for large droplet size, thereby retarding ignition process significantly. This may cause no ignitable condition, which we call the ignitable limit. Then, the mechanism of ignition and ignitable limit were also discussed.
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