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Flow, Turbulence and Combustion
Published in: Flow, Turbulence and Combustion 4/2018

20-07-2018

Three-dimensional Linear Eddy Modeling of a Turbulent Lifted Hydrogen Jet Flame in a Vitiated Co-flow

Authors: Fredrik Grøvdal, Sigurd Sannan, Jyh-Yuan Chen, Alan R. Kerstein, Terese Løvås

Published in: Flow, Turbulence and Combustion | Issue 4/2018

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Abstract

A new methodology for modeling and simulation of reactive flows is reported in which a 3D formulation of the Linear Eddy Model (LEM3D) is used as a post-processing tool for an initial RANS simulation. In this hybrid approach, LEM3D complements RANS with unsteadiness and small-scale resolution in a computationally efficient manner. To demonstrate the RANS-LEM3D model, the hybrid model is applied to a lifted turbulent N2-diluted hydrogen jet flame in a vitiated co-flow of hot products from lean H2/air combustion. In the present modeling approach, mean-flow information from RANS provides model input to LEM3D, which returns the scalar statistics needed for more accurate mixing and reaction calculations. Flame lift-off heights and flame structure are investigated in detail, along with other characteristics not available from RANS alone, such as the instantaneous and detailed species profiles and small-scale mixing.
previous article Large Eddy Simulation of a Bluff Body Stabilised Premixed Flame Using Flamelets
next article A Computational Fluid Dynamic Investigation of Inhomogeneous Hydrogen Flame Acceleration and Transition to Detonation

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Footnotes
1
For non-reacting flows the counter gradient assumption implies that the averaged transport \(\overline {\rho \textbf {u}^{\prime \prime }\phi ^{\prime \prime }}\) of a scalar ϕ is oriented in a direction opposite to the normal gradient of the turbulent diffusion.
 
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Metadata
Title
Three-dimensional Linear Eddy Modeling of a Turbulent Lifted Hydrogen Jet Flame in a Vitiated Co-flow
Authors
Fredrik Grøvdal
Sigurd Sannan
Jyh-Yuan Chen
Alan R. Kerstein
Terese Løvås
Publication date
20-07-2018
Publisher
Springer Netherlands
Published in
Flow, Turbulence and Combustion / Issue 4/2018
Print ISSN: 1386-6184
Electronic ISSN: 1573-1987
DOI
https://doi.org/10.1007/s10494-018-9963-x

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