Because of the large number of variables involved, detailed combustion chemistry needs to be reduced, or tabulated, before its introduction in turbulent flame simulations. In flamelet-based tabulations, species mass fractions, or chemical source terms, are stored as functions of control parameters, such as mixture fraction and progress variables. These techniques may generate quite large look-up table files, which have been downsized in the past taking benefit of the self-similar behavior of one-dimensional laminar premixed flames with extension to turbulent flames. This self-similar flamelet tabulation (S2FT) is for non-diluted laminar premixed flames and the formalism was derived studying flames in physical-space. S2FT was then extended to burnt gases diluted flames, including heat loss, with a self-similar solution derived in a progress-variable space. The objective of the present work is to further explore this downsizing approach to the oxidation of n-heptane, in the context of auto-ignition with cool-flame effects. The heavy chemical database is then replaced by a few profiles with a set of algebraic relations.
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