Evaluation of Afterburning Chemistry in Solid-Rocket Motor Jets Using an Off-Line Model

This paper focuses on a decisive step toward large-eddy simulation of a solid-rocket motor jet. A model based on solving constant-pressure reactors with a chemical solver was implemented. It is able to evaluate the temperature and chemical species distributions resulting from afterburning chemistry along streamlines of an existing frozen flowfield. This method was applied to a time-averaged flowfield obtained from large-eddy simulations of a single-species solid-rocket motor jet. Despite its limitations, the model is accurate enough to observe the various steps of the chemical mechanism and assess the effect of uncertainties of the rate parameters on chlorine reactions. The results are coherent with those obtained in previous studies and offer a relevant evaluation of the flowfield characteristics, helpful for future large-eddy simulations of a multispecies, reactive solid-rocket motor jet.