The problems and choices in the design of an advanced subsonic transport turbofan for reduced noise and improved aircraft performance are examined in this paper. The effects of bypass ratio, fan pressure ratio, and fan tip speed on jet noise, fan noise, and acoustic treatment suppression are described. The results do not indicate a clear optimum bypass ratio considering the effects upon installed engine performance and weight as well as acoustic performance. Low fan tip speed designs with the associated high aerodynamic loading are compared to high tip speed low loading designs. Other factors affecting noise such as the installation and other noise sources are discussed. The long duct installation is indicated to have potential advantages over the short duct separate flow installation. The problem of assuring that growth models of an engine also have low noise is discussed.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Noise Considerations in the Design of Advanced Subsonic Transport Turbofan Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Benzakein, M. J. (Autor:in) / Neitzel, R. E. (Autor:in)

    Kongress:

    National Aeronautic and Space Engineering and Manufacturing Meeting ; 1970



    Erscheinungsdatum :

    1970-02-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Future trends in subsonic transport energy efficient turbofan engines

    Johnston, R.P. / Ortiz, P. | Tema Archiv | 1980


    Sensitivity of subsonic transport range to turbofan engine design

    Fishbach, L. H. / Koenig, R. W. | NTRS | 1969


    Candidate turbofan engines for subsonic aircraft of 1970's

    Pedersen, G.H. / Smith, J.C. | Engineering Index Backfile | 1966



    CANDIDATE TURBOFAN ENGINES FOR SUBSONIC AIRCRAFT OF THE 1970’s

    Pedersen, G. H. / Smith, J. C. | SAE Technical Papers | 1966