Numerical analysis of dilute methanol spray flames in vitiated coflow using extended flamelet generated manifold model

Journal article (2022)

Authors

Bharat Bhatia Indian Institute of Technology Kanpur
Ashoke De Indian Institute of Technology Kanpur
D.J.E.M. Roekaerts Fluid Mechanics - Mechanical, Maritime and Materials Engineering
Assaad R. Masri University of Sydney
Research Group
Fluid Mechanics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2022 Bharat Bhatia, Ashoke De, D.J.E.M. Roekaerts, Assaad R. Masri
DOI
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https://doi.org/10.1063/5.0098705
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Published Date

2022

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Fluid Mechanics

Abstract

This work focuses on the large eddy simulation and the study of turbulent dilute methanol spray flames in vitiated coflow using the secondary-oxidizer Flamelet Generated Model (FGM). The modified FGM model uses an additional secondary oxidizer parameter in addition to the three other parameters previously used for spray flames - progress variable, mixture fraction, and enthalpy. The results for gas phase and droplet properties are validated against the dilute methanol spray flame database for varying fuel injection amounts. The droplet statistics and the liftoff flame heights are accurately captured for all the cases. A proper orthogonal decomposition (POD) of the scalar fluctuating hydroxyl radical (OH) field and the velocity-temperature field captures the flame structures in the downstream region of ignition kernels. The detailed POD analysis reveals that the base frequency of the dominant OH field equals that of the dominant vortical structure of 67.3 Hz. The flame propagation happens around these dominant vortical structures because of the less-strained fluid mixing.

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