Transported PDF simulations of the Delft-jet-in-hot-coflow burner based on 3D FGM tabulated chemistry

摘要

A transported probability density function (PDF) method is used for modeling the flameless combustion in the Delft-Jet-in-Hot-Coflow (DJHC) burner. The DJHC burner creates a turbulent diffusion flame of natural gas fuel in a hot coflow of lean combustion products. The main advantage of the PDF method is that complex finite-rate chemistry is treated exactly and the method accounts for the turbulence-chemistry interaction. To reduce the computational time, a tabulated chemistry model based on the so called Flamelet Generated Manifold (FGM) is adopted in the PDF method. The FGM table that describes the inhomogeneity of the coflow and the entrainment of the ambient air is based on two mixture fractions and a progress variable. A comparison in performance between two transported PDF methods, joint velocity-composition and joint composition PDF, with different mixing models is presented.