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Noise Sources of Lean Premixed Flames

  • Konrad PauschEmail author
  • Sohel Herff
  • Feichi Zhang
  • Henning Bockhorn
  • Wolfgang Schröder
Original research
  • 130 Downloads

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.

Keywords

Thermoacoustics Combustion noise Combustion instabilities CAA 

Notes

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.

Compliance with Ethical Standards

Conflict of interests

The authors declare that they have no conflicts of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Institute of AerodynamicsRWTH Aachen UniversityAachenGermany
  2. 2.Engler-Bunte-Institute, Division of Combustion TechnologyKarlsruhe Institute of TechnologyKarlsruheGermany
  3. 3.Forschungszentrum JülichJARA High-Performance ComputingJülichGermany

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