Abstract
Different combustion models such as PCM (Presumed Conditional Moments) or ADF-PCM (Approximated Diffusion Flames Presumed Conditional Moments) can be used for RANS simulations of non premixed or partially premixed turbulent flames. In this paper, the auto-ignition experiment performed by Mastorakos and co-workers at Cambridge University is used as a validation case for comparing these two approaches. Furthermore, the first order PCM model is introduced to analyze the effects of the progress variable segregation and an improved version of ADF-PCM is developed with a pdf of the scalar dissipation rate. Compared to ADF-PCM models, the first and second order PCM models predict very sharp temperature and progress variable increase after ignition for all simulated cases. The segregation factors of the progress variable reach important values during the ignition for ADF-PCM models whereas for PCM, high values are reached at the beginning of the ignition.
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Michel, JB., Colin, O. & Veynante, D. Comparison of Differing Formulations of the PCM Model by their Application to the Simulation of an Auto-igniting H 2/air Jet. Flow Turbulence Combust 83, 33–60 (2009). https://doi.org/10.1007/s10494-008-9188-5
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DOI: https://doi.org/10.1007/s10494-008-9188-5