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

Grøvdal, Fredrik; Sannan, Sigurd; Chen, Jyh-Yuan; Kerstein, Alan R; Løvås, Terese
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2559976
Date
2018
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  • Institutt for energi og prosessteknikk [2680]
  • Publikasjoner fra CRIStin - NTNU [20734]
Original version
Flow Turbulence and Combustion. 2018, .   10.1007/s10494-018-9963-x
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.
Publisher
Springer Verlag
Journal
Flow Turbulence and Combustion

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