Analytical studies based on a turbulent mixing noise prediction technique indicate that jet noise power levels are increased when a jet is situated in a crossflow. V/STOL model transport acoustic test data obtained in the NASA Ames 40 ft. x 80 ft. wind tunnel confirmed this jet noise power level increase due to crossflow. Increases up to 6 db at a Strouhal number of 2.5 and crossflow velocity to jet velocity ratio of 0.58 were observed. The power level increases observed in the experimental data confirm the predicted power level increases.


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    Title :

    Effect of crossflow velocity on the generation of lift fan jet noise in VTOL aircraft


    Contributors:

    Publication date :

    1973-02-01


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English


    Keywords :




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    LIEBLEIN, S. / YUSKA, J. A. / DIEDRICH, J. H. | AIAA | 1973


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