The effect of length of acoustic treatment was studied on a full scale fan using two different inlets. Analysis of the data revealed that measured suppression varied linearly with the length of the ringed liner segments as anticipated. Further analysis indicated that the wall only portion of the treatment was substantially more effective than anticipated, suggesting that, if only moderate suppression is needed, wall only treatment may suffice. The two inlets behaved similarly. Introduction of a hard exhaust splitter into the configuration resulted in a noise increase at certain frequencies.


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    Title :

    An experimental study of the effect of treated length on fan inlet noise suppressors


    Contributors:

    Conference:

    Aerospace Sci. Meeting ; 1975 ; Pasadena, CA, United States


    Publication date :

    1974-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English







    Performance of inlet sound suppressors

    Feiler, C. E. / Rice, E. J. / Smith, L. J. | NTRS | 1968


    Performance of Inlet Sound Suppressors

    C. E. Feiler / E. J. Rice / L. J. Smith | NTIS | 1968