Characteristics were determined for twin engine jet aircraft having 8-lobe nozzles and ejectors, and unmodified aircraft; in-flight sound pressure levels measured on ground under flight path were reduced 5 to 6 db by suppressors; increases in total drag coefficient of 3 and 7% and decreases in specific range of 5 to 14% were found to result from suppressor.


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    Title :

    Ground and in-flight acoustic and performance characteristics of jet-aircraft exhaust noise suppressors


    Additional title:

    NASA -- Tech Note


    Contributors:
    Coles, W.D. (author) / Mihaloew, J.A. (author) / Swann, W.H. (author)


    Publication date :

    1961


    Size :

    50 pages


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English