Large-eddy simulation of a three-stream MILD combustion system

Large-eddy simulations (LES) of a three-stream burner system are performed. This burner is operated in the so-called moderate and intense low-oxygen dilution (MILD) combustion regime. An extended flamelet/progress variable (FPV) model is utilized, in which an additional scalar is introduced in order to account for the mixing between the three reactant streams. LES-calculations of three different operating conditions are performed, corresponding to increased levels of oxygen-dilution in the vitiated coflow. The extended FPV model accurately predicts effects of the oxygen-dilution on the flame-structure and heat- release, and model-predictions for temperature and major and minor species are in good agreements with the measurements.