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Noise Sources of Lean Premixed Flames

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Abstract

The thermoacoustic sound generation mechanisms of lean premixed laminar and turbulent flames are investigated by a two-step approach. First, the conservation equations of a reacting compressible fluid are solved. This solution is used to determine the acoustic source terms of the acoustic perturbation equations (APE). Second, the contributions of the different source terms to the amplitude and phase of the acoustic pressure signal are analyzed by solving the APE in a computational aeroacoustics (CAA) simulation. The results show that it is not sufficient to only consider the unsteady heat release rate fluctuations which occur in the substantial pressure-density relation. The acceleration of density gradients occurring at the flame front is a significant contributor to the overall sound emission. For the investigated laminar and turbulent flames the amplitude and phase of the acoustic pressure signal can only be predicted accurately if both source terms are included in the acoustic analysis.

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Acknowledgments

This study was supported by the DFG funded grants SCHR 309/69, SCHR 309/43, and BO 693/26-2. The authors are grateful for the computing resources provided by the High Performance Computing Center Stuttgart (HLRS) within a Large-Scale Project of the Gauss Center for Supercomputing (GCS) and we acknowledge PRACE for awarding us access to resource JUQUEEN [63] based in Germany at Jülich Supercomputing Centre.

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Authors and Affiliations

  1. Institute of Aerodynamics, RWTH Aachen University, Wüllnerstraße 5a, Aachen, 52062, Germany

    Konrad Pausch, Sohel Herff & Wolfgang Schröder

  2. Engler-Bunte-Institute, Division of Combustion Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, Karlsruhe, 76131, Germany

    Feichi Zhang & Henning Bockhorn

  3. Forschungszentrum Jülich, JARA High-Performance Computing, Wilhelm-Johnen-Straße, Jülich, 52425, Germany

    Wolfgang Schröder

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  1. Konrad Pausch
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Correspondence to Konrad Pausch.

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Pausch, K., Herff, S., Zhang, F. et al. Noise Sources of Lean Premixed Flames. Flow Turbulence Combust 103, 773–796 (2019). https://doi.org/10.1007/s10494-019-00032-0

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