In modern aeroengines, combustion noise has become a significant source to the overall noise, particularly at approach conditions. This requires further advances in understanding and predicting combustion noise of turbulent flames. This is the aim of the present study, where a hybrid computational fluid dynamics/computational aeroacoustics approach is applied on a generic premixed and pressurized combustor to assess its accuracy for combustion noise predictions. The hybrid approach consists of Reynolds-averaged Navier–Stokes (RANS) or large-eddy simulations (LES) mean flow and frequency-domain simulations based on linearized Navier–Stokes equations that are fed by combustion noise source terms. The latter are obtained from both the application of a statistical noise model on the RANS simulations and a postprocessing of incompressible LES, in a first step. The acoustic simulation results are compared with experimental pressure measurements conducted by the Centre National de la Recherche Scientifique. Very good agreement is found over the entire frequency range if the LES source model is applied. Sensitivity studies with respect to feeding lines, mean flowfield, and mesh were performed. The resulting comparisons of the linearized Navier–Stokes equation simulations based on the RANS and LES flowfields revealed that the combustion noise spectrum is mainly governed by the heat release spectrum but not by the aerodynamic combustor flowfield. However, this issue needs further investigation.


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    Title :

    Combustion Noise Prediction Using Linearized Navier–Stokes Equations and Large-Eddy Simulation Sources



    Published in:

    Publication date :

    2018-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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