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

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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.

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Notes

  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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Acknowledgements

This work was conducted at the Norwegian University of Science and Technology and SINTEF Energy Research, Norway. It was supported by The Research Council of Norway through the project HYCAP (233722).

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Authors and Affiliations

  1. NTNU Department of Energy and Process Engineering, NO-7034, Trondheim, Norway

    Fredrik Grøvdal & Terese Løvås

  2. SINTEF Energy Research, NO-7465, Trondheim, Norway

    Sigurd Sannan

  3. Department of Mechanical Engineering, UC Berkeley, Berkeley, CA, 94720, USA

    Jyh-Yuan Chen

  4. 72 Lomitas Road, Danville, CA, 94526, USA

    Alan R. Kerstein

Authors
  1. Fredrik Grøvdal
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  2. Sigurd Sannan
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  3. Jyh-Yuan Chen
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  4. Alan R. Kerstein
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  5. Terese Løvås
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Correspondence to Fredrik Grøvdal.

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Grøvdal, F., Sannan, S., Chen, JY. et al. Three-dimensional Linear Eddy Modeling of a Turbulent Lifted Hydrogen Jet Flame in a Vitiated Co-flow. Flow Turbulence Combust 101, 993–1007 (2018). https://doi.org/10.1007/s10494-018-9963-x

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