Assessment of a Partially Stirred Reactor combustion model to predict the Lean Blow-Out limit of a ramjet combustor

Long-term goals of the Research Ramjet Program (RRP) led at Onera are to provide a better understanding of the reacting flows inside r amjet combustion chambers and develop a predictive numerical tool, capable of characterizin g the performances of such combustors. A part of this program focuses on the Lean-Blow Out (LBO) phenomenon and aims at improving the understanding of the physical processes involved in the combustor blowoff and the calculations to predict this limit. The pre sent paper is mainly concerned with the computational component of that study, and specifically with the assessment of a Partially Stirred Reactor (PaSR) turbulent combustion model recently integrated in the Onera inhouse Computational Fluid Dynamic (CFD) code CEDRE. This combustion model, based on the Eddy Dissipation Concept (EDC) closure of Magnussen, is designed to describe the Turbulence ‐ Chemistry Interaction (TCI). Calculations have been performed to simulate a nominal operating point, and predict the LBO limit of the Research Ramjet combustion chamber. Significant results have been highlighted: 1) the PaSR combustion model yields results in good agreement with experimental data fo r the nominal operating point, and 2) the predicted LBO limit using the PaSR closure is fully satisfactory compared to the measurements.

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