Acoustic measurements were carried out in the engine intake ducts of the Fokker F28 test aircraft during flight. One of the low bypass ratio engines with a hard walled intake was instrumented to detect the circumferential modes of the sound field. Aerodynamic measurements were carried out to determine the flow conditions in the intake near the wall. In the other engine the impedance of the inlet acoustic liner was measured. An error analysis of the instrumentation is given. It is concluded that the in-flight measurement of acoustic pressure ratios with an accuracy of 4.08% and 2.61 deg., and the measurement of stationary pressure with an accuracy of 0.55% is feasible.


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    Title :

    Instrumentation for in-Flight Acoustic Measurements in an Engine Intake


    Contributors:

    Publication date :

    1983


    Size :

    9 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    In-flight acoustic measurements in the engine intake of a Fokker F28aircraft

    ZANDBERGEN, T. / LAAN, J. / ZEEMANS, H. et al. | AIAA | 1983


    In-Flight Acoustic Measurements in the Engine Intake of a Fokker F28 Aircraft

    T. Zandbergen / J. N. Laan / H. J. Zeemans et al. | NTIS | 1983



    Flight Instrumentation

    Ford C. Eng., Terry | Emerald Group Publishing | 1985