Three-dimensional Linear Eddy Modeling of a Turbulent Lifted Hydrogen Jet Flame in a Vitiated Co-flow |
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| Authors: | Fredrik Grøvdal Sigurd Sannan Jyh-Yuan Chen Alan R. Kerstein Terese Løvås |
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| Affiliation: | 1.NTNU Department of Energy and Process Engineering,Trondheim,Norway;2.SINTEF Energy Research,Trondheim,Norway;3.Department of Mechanical Engineering,UC Berkeley,Berkeley,USA;4.Danville,USA |
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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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