Abstract This paper describes a detailed flutter analysis of fan casing contour modifications on a scaled high-speed fan to investigate the influence and effect on flutter boundaries. The flutter analysis focusses on discrete selected members from a previous multidisciplinary study of an automated aero-acoustic optimization with respect to the overall engine performance. The aerodynamic baseline performance of the high-bypass ratio fan is validated with measured rig data using Reynolds-averaged Navier–Stokes (RANS) CFD simulations. Flutter stability predictions are based on the energy method in traveling wave and influence the coefficient formulation using a multi-passage fan assembly in a wide engine operating range. Transonic stall flutter occurs for the first bending mode of blade vibration at part speed, where a few design members show an increased stabilizing aeroelastic behavior especially at approach flight condition. In contrast to that, the results indicate a destabilizing flutter stability effect for certain casing designs at cruise speed related to higher mass flows near choke, which is identified as a transonic unstalled flutter type. Aerodynamic key parameters for the flutter onset mechanism have proved to be the shock/boundary layer interactions in tip region of the fan suction side, which leads to flow separation. A second mechanism is driven by the additional blade vibration in combination with the interaction of shock and tip clearance flow as well as the incoming flow.


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    Titel :

    Influence of casing contouring on flutter boundaries of a jet engine fan


    Beteiligte:
    Iseni, S. (Autor:in) / Micallef, D. (Autor:in) / Engelmann, D. (Autor:in) / Mailach, R. (Autor:in) / Nicke, E. (Autor:in) / di Mare, F. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2018




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch



    Klassifikation :

    BKL:    50.03 Methoden und Techniken der Ingenieurwissenschaften / 50.03 Methoden und Techniken der Ingenieurwissenschaften, Methoden und Techniken der Ingenieurwissenschaften / 55.50 Luftfahrzeugtechnik / 55.50 Luftfahrzeugtechnik, Luftfahrzeugtechnik
    DDC:    629.105



    Influence of casing contouring on flutter boundaries of a jet engine fan

    Iseni, S. / Micallef, D. / Engelmann, D. et al. | Springer Verlag | 2018




    Computing Flutter Boundaries

    Kielb, Robert E. / Kaza, Krishna Rao V. | NTRS | 1989


    Control of Blade Flutter by Smart-Casing Treatment

    Xiaofeng Sun / Xiaodong Jing / Hongwu Zhao | AIAA | 2001