Experimental and numerical study of MILD combustion in a lab-scale furnace

Abstract (2016)

Authors

X. Huang Fluid Mechanics - Mechanical, Maritime and Materials Engineering
M.J. Tummers Fluid Mechanics - Mechanical, Maritime and Materials Engineering
D.J.E.M. Roekaerts Fluid Mechanics - Mechanical, Maritime and Materials Engineering
Research Group
Fluid Mechanics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2016 X. Huang, M.J. Tummers, D.J.E.M. Roekaerts
Furnace OpenFOAM Turbulent combustion NOx Flameless MILD
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Published Date

2016

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Fluid Mechanics

Abstract

Mild combustion in a lab-scale furnace has been experimentally and numerically studied. The furnace was operated with Dutch natural gas (DNG) at 10 kW and at an equivalence ratio of 0.8. OH∗chemiluminescence images were taken to characterize the reaction zone. The chemiluminescence intensity is relatively low compared to conventional flames and relatively uniformly distributed in the reaction zone due to the dilution effects of recirculated burnt gases. Visible flames were not observed. To characterize the dilution effects of burnt gases on reactions, flamelets generated with diluted fuel and diluted air, instead of flamelets based on pure fuel and air, were applied in an extended Flamelet Generated Manifold (FGM) approach. Burnt gases at stoichiometric mixture fraction rather than those at global equivalence ratio were considered as diluent, which is more appropriate for furnaces operating at lean condition. The numerical simulations were performed using the open source CFD package-OpenFOAM.