Computing combustion noise by combining large eddy simulations with analytical models for the propagation of waves through turbine blades

Abstract : Two mechanisms control combustion noise generation as shown by Marble and Candel (1977) [1]: direct noise, in which acoustic waves propagate through the turbine stages and indirect noise, in which vorticity and/or entropy waves generate noise as they are convected through turbine stages. A method to calculate combustion-generated noise has been implemented in a tool called CHORUS. The method uses the large eddy simulations of the combustion chamber obtained with the unstructured solver AVBP developed at CERFACS (Schonfeld and Rudgyard, 1999 [2]) and analytical models for the propagation through turbine stages. The propagation models (Cumpsty and Marble, 1977 [3]) use the compact row hypothesis to write matching conditions between the inlet and the outlet of a turbine stage. Using numerical simulations, the validity of the analytical methods is studied and the errors made quantified.
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Ignacio Duran, Matthieu Leyko, Stéphane Moreau, Franck Nicoud, Thierry Poinsot. Computing combustion noise by combining large eddy simulations with analytical models for the propagation of waves through turbine blades. Comptes rendus de l’Académie des sciences. Série IIb, Mécanique, Elsevier, 2013, 341 (1-2), pp.131-140. ⟨10.1016/j.crme.2012.10.012⟩. ⟨hal-00821090⟩

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