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Scalar Superlayer Contributions to the Mixture Fraction Pdf in a Jet Flow

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.60
pages 61-71

Markus Gampert
Department of Combustion Technology RWTH Aachen University Templergraben 64, 52056 Aachen, Germany

Philip Schaefer
Department of Combustion Technology RWTH Aachen University Templergraben 64, 52056 Aachen, Germany

Norbert Peters
Department of Combustion Technology RWTH Aachen University Templergraben 64, 52056 Aachen, Germany

Sinopsis

Based on two-dimensional high-speed measurements of the mixture fraction Z in a turbulent round jet with nozzle based Reynolds numbers between 3,600 and 8,000, we investigate the scalar superlayer of the flow. Since combustion occurs in the vicinity of the stoichiometric mixture fraction, which is around Z=0.06 for typical fuel/air mixtures, it is expected to take place largely within that layer. Therefore, profound understanding of this part of the flow is essential for an accurate modeling of turbulent non-premixed combustion. To this end, we validate a composite model of Effelsberg & Peters [1] for the pdf P(Z) which takes into account the different contributions stemming from the fully turbulent as well as the superlayer part of the flow. We observe a very good agreement between the measurements and the model over a wide range of flow conditions.

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