Hybrid RANS/PDF simulations of the adelaide jet-in-hot-coflow burner using 3D FGM tabulated chemistry

Conference paper (2018)

Authors

Ashoke De Indian Institute of Technology Kanpur

Bharat Bhatia Indian Institute of Technology Kanpur

G. Sarras Energy Technology - Mechanical, Maritime and Materials Engineering , ChemE/Transport Phenomena -

D.J.E.M. Roekaerts Fluid Mechanics - Mechanical, Maritime and Materials Engineering

Research Group

Fluid Mechanics (Mechanical, Maritime and Materials Engineering) (TU Delft)

FGM Hybrid RANS/PDF Jet-in-Hot-Coflow

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Published Date

2018

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Fluid Mechanics

Abstract

A probability density function (PDF) based combustion modeling approach for RANS is used in the simulation of a jet issuing into a hot and diluted coflow. A tabulated chemistry based model, i.e. Flamelet Generated Manifold (FGM), is adopted in the PDF method. The manifolds are constructed using igniting counter-flow diffusion flamelets with different coflow composition. To handle the inhomogeneity of the coflow and the entrainment of the ambient air, a second mixture fraction is defined to quantify the mixing of a representative coflow composition with the ambient air. The chemistry is then parameterized as a function of two mixture fractions and a reaction progress variable. Two flames, namely HM1 and HM3, having different oxygen mass concentration in the hot coflow, 3% and 9% O2 respectively, have been simulated for Reynolds number (Re) =10000. The mean oxygen concentration and temperature profiles are well predicted showing the capability of the tabulated chemistry. Profiles of mean mixture fraction and major species are also accurately captured by the model.