Simulation and modelling of the waves transmission and generation in a stator blade row in a combustion-noise framework |
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| Institution: | 1. CERFACS, 31057 Toulouse, France;2. Snecma, 77550 Moissy-Cramayel, France;3. Université de Sherbrooke, Sherbrooke, QC, Canada J1K2R1;4. I3M, Université Montpellier II, UMR CNRS 5149, France;5. Institut de Mécanique des Fluides de Toulouse, 31400 Toulouse, France;1. Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;2. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK;1. CERFACS, CFD team, 42 Av Coriolis, 31057 Toulouse, France;2. Société Nationale d’Etude et de Construction de Moteurs d’Aviation, 77550 Reau, France;3. NTNU, Department of Energy and Process Engineering, 7491 Trondheim, Norway;4. Institut de Mécanique des Fluides de Toulouse, INP de Toulouse and CNRS, Avenue C. Soula, 31400 Toulouse, France;1. Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;2. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK |
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| Abstract: | The combustion noise in aero-engines is known to have two different origins. First, the direct combustion noise is directly generated by the flame itself. Second, the indirect combustion noise is caused by the acceleration in the turbine stages of entropy spots generated by the combustion. In both cases, the turbo-machinery is involved in the combustion-noise transmission and generation. Numerical simulations are performed in the present study to assess the global noise for a real aeronautical configuration. On the one hand, the acoustic and entropy transfer functions of an isolated blade row are obtained using two-dimensional unsteady simulations. The transfer functions of the blade row are compared with the model of Cumpsty and Marble that assumes an axially compact configuration. On the other hand, the acoustic and entropy sources coming from a combustion chamber are calculated from a three-dimensional Large Eddy Simulation (LES). This allows an evaluation of the error introduced by the model for the present combustion chamber using the previous numerical simulations. A significant error is found for the indirect combustion noise, whereas it stays reasonable for the direct one. |
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