A scale model Advanced Ducted Propulsor (ADP) was tested in NASA Lewis Research Center's 8- by 6-Foot Wind Tunnel to obtain acoustic data at cruise conditions. The model, designed and manufactured by Pratt & Whitney Division of United Technologies, was tested with three inlet lengths. The model has 16 rotor blades and 22 stator vanes, which results in a cut-on condition with respect to rotor-stator interaction noise. Comparisons of the noise directivity of the ADP with that of a previously tested high-speed, unducted propeller showed that the ADP peak blade passing tone was about 30 dB below that of the propeller, and therefore, should not present a cabin or enroute noise problem. The maximum blade passing tone first increased with increasing helical tip Mach number, peaked, and then decreased at a higher Mach number. The ADP tests with the shortest inlet showed more noise in the inlet arc than did tests with either of the other two inlet lengths.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Cruise Noise Measurements of a Scale Model Advanced Ducted Propulsor


    Beteiligte:
    J. H. Dittmar (Autor:in) / C. E. Hughes (Autor:in) / L. A. Bock (Autor:in) / D. G. Hall (Autor:in)

    Erscheinungsdatum :

    1993


    Format / Umfang :

    12 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Cruise Noise Measurements of a Scale Model Advanced Ducted Propulsor

    Dittmar, J. H. / Hughes, C. E. / Bock, L. A. et al. | British Library Conference Proceedings | 1993


    Cruise noise measurements of a scale model advanced ducted propulsor

    Dittmar, James H. / Hughes, Christopher E. / Bock, Lawrence A. et al. | NTRS | 1993