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.


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    Title :

    Cruise noise measurements of a scale model advanced ducted propulsor


    Contributors:

    Conference:

    AIAA Aeroacoustics Conference ; 1993 ; Long Beach, CA, United States


    Publication date :

    1993-10-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    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

    J. H. Dittmar / C. E. Hughes / L. A. Bock et al. | NTIS | 1993