Subsonic and supersonic aircraft concepts proposed through NASA's Fundamental Aeronautics Program have multiple engines mounted near one another. Engine configurations with multiple jets introduce an asymmetry to the azimuthal directivity of the jet noise. Current system noise predictions add the jet noise from each jet incoherently, therefore, twin jets are estimated by adding 3 EPNdB to the far-field noise radiated from a single jet. Twin jet effects have the ability to increase or decrease the radiated noise to different azimuthal observation locations. Experiments have shown that twin jet effects are reduced with forward flight and increasing spacings. The current experiment investigates the impact of spacing, and flight effects on airport noise for twin jets. Estimating the jet noise radiated from twin jets as that of a single jet plus 3 EPNdB may be sufficient for horizontal twin jets with an s/d of 4.4 and 5.5, where s is the center-to-center spacing and d is the jet diameter. However, up to a 3 EPNdB error could be present for jet spacings with an s/d of 2.6 and 3.2.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Impact of Subsonic Twin Jets on Airport Noise


    Beteiligte:
    R. F. Bozak (Autor:in)

    Erscheinungsdatum :

    2012


    Format / Umfang :

    18 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch






    The Impact of Twin Jets on Airport Noise

    Bozak, Richard | AIAA | 2012


    Noise Sources of Closely Installed Subsonic Jets

    Wang, Zhong-Nan / Harris, Brandon / Tyacke, James et al. | AIAA | 2024


    Second-Moment Modelling of Subsonic and Transonic Impinging Twin Jets

    Ince, N. Z. / Page, G. / Leschziner, M. A. et al. | British Library Conference Proceedings | 1993