Tests were conducted in the NASA Lewis Research Center's Powered Lift Facility to experimentally evaluate the noise generated by a flight weight, 12 in. butterfly valve installed in a proposed vertical takeoff and landing thrust vectoring system. Fluctuating pressure measurements were made in the circular duct upstream and downstream of the valve. This data report presents the results of these tests. The maximum overall sound pressure level is generated in the duct downstream of the valve and reached a value of 180 dB at a valve pressure ratio of 2.8. At the higher valve pressure ratios the spectra downstream of the valve is broad banded with its maximum at 1000 Hz.


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    Title :

    Noise generated by a flight weight, air flow control valve in a vertical takeoff and landing aircraft thrust vectoring system


    Contributors:

    Publication date :

    1989-02-01


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English


    Keywords :