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https://doi.org/10.1007/s10494-015-9689-y
Title: | Prediction of Global Extinction Conditions and Dynamics in Swirling Non-premixed Flames Using LES/CMC Modelling | Authors: | Zhang, H Mastorakos, E |
Keywords: | Air Combustion Forecasting Large eddy simulation Accurate prediction Blow off Conditional moment closure Localized extinctions Non-premixed flame Operating condition Scalar dissipation rate Stoichiometric mixture fraction Flame research |
Issue Date: | 2016 | Publisher: | Springer Netherlands | Citation: | Zhang, H, Mastorakos, E (2016). Prediction of Global Extinction Conditions and Dynamics in Swirling Non-premixed Flames Using LES/CMC Modelling. Flow, Turbulence and Combustion 96 (4) : 863-889. ScholarBank@NUS Repository. https://doi.org/10.1007/s10494-015-9689-y | Rights: | Attribution 4.0 International | Abstract: | The Large Eddy Simulation (LES)/three-dimensional Conditional Moment Closure (CMC) model with detailed chemistry is applied to predict the operating condition and dynamics of complete extinction (blow-off) in swirling non-premixed methane flames. Using model constants previously selected to provide relatively accurate predictions of the degree of local extinction in the piloted jet flames Sandia D ?F, the error in the blow-off air velocity predicted by LES/3D-CMC in short, recirculating flames with strong swirl for a range of fuel flow rates is within 25 % of the experimental value, which is considered a new and promising result for combustion LES that has not been applied before for the prediction of the whole blow-off curve in complex geometries. The results also show that during the blow-off transient, the total heat release gradually decreases over a duration that agrees well with experiment. The evolution of localized extinction, reactive scalars and scalar dissipation rate is analyzed. It has been observed that a consistent symptom for flames approaching blow-off is the appearance of high-frequency and high-magnitude fluctuations of the conditionally filtered stoichiometric scalar dissipation rate, resulting in an increased fraction of local extinction over the stoichiometric mixture fraction iso-surfaces. It is also shown that the blow-off time changes with the different blow-off conditions. © 2015, The Author(s). | Source Title: | Flow, Turbulence and Combustion | URI: | https://scholarbank.nus.edu.sg/handle/10635/179572 | ISSN: | 1386-6184 | DOI: | 10.1007/s10494-015-9689-y | Rights: | Attribution 4.0 International |
Appears in Collections: | Elements Staff Publications |
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