Four numerical simulations of the NASA Active Noise Control Fan rig with some modifications have been performed to investigate the influence of the heterogeneity of the stator row on the tonal noise radiation for a realistic turbofan with a high hub-to-tip ratio. These simulations achieved with the Powerflow solver based on the lattice Boltzmann method provide a direct acoustic prediction for both tonal and broadband noise. The numerical simulations are used to evaluate the noise contributions of the rotor-wake interaction with the stator vanes, and the rotor interaction with both the inlet distortion and the potential field generated by the stator row. Analytical models are evaluated on this configuration using the flow description provided by the simulations. Rotor-wake and inlet-distortion interaction noise generation with in-duct propagation uses the classical Amiet’s response, whereas Parry’s model is used for the rotor response to the potential field. The simulation is used to evaluate simple excitation models for the potential field and the rotor-wake evolutions. The analytical results for homogeneous and heterogeneous configurations compare well with the detailed acoustic modal powers extracted from the direct acoustic field simulated with Powerflow. The wake interaction remains the dominant source in the present heterogeneous configurations.


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    Title :

    Effect of Weak Outlet-Guide-Vane Heterogeneity on Rotor–Stator Tonal Noise


    Contributors:

    Published in:

    AIAA Journal ; 55 , 10 ; 3440-3457


    Publication date :

    2017-10-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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