A computational investigation of aerodynamic characteristics of a model ultrahigh-bypass ratio counter-rotating fan (m=20) developed at CIAM within the framework of the European Project COBRA (Innovative Counter Rotating Fan System for High Bypass Ratio Aircraft Engine), is presented in the work. The unsteady nature of the flow in a counter-rotating fan was studied; the rotor-rotor interaction intensity and unsteady viscous wake propagation through the axial gap and second rotor blade were analyzed. The results of numerical investigation of the fan tonal noise in the approach mode are also presented. The acoustic calculations were performed using the in-house CIAM code 3DAS. Far-field directivity diagrams for the first 16 harmonics of tonal noise in the front and rear hemisphere, obtained in the calculation, are shown. The results were compared with the respective results of calculation for a model high-bypass ratio counter-rotating fan with a high-bypass ratio m=10 (designed in VITAL project). Additionally the results were compared with the experimental results for a fan with m=20.


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    Titel :

    Computational investigation of aerodynamic and acoustic characteristics of an ultrahigh-bypass ratio counter-rotating fan


    Beteiligte:
    Ya. M. Druzhinin (Autor:in) / V. I. Mileshin (Autor:in) / A. A. Rossikhin (Autor:in)


    Erscheinungsdatum :

    2018




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Unbekannt




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