The effect of front-to-rear propeller spacing on the interaction noise of a counterrotation propeller model was measured at cruise conditions. The data taken at an axial Mach number of 0.80 behaved as expected: interaction noise was reduced with increased spacing. The data taken at M=0.76 and M=0.72 did not behave as expected. At some of the test conditions the noise was unchanged; others even showed noise increases with increased spacing. A possible explanation, involving the amount of downstream blade area impacted by the tip vortex, is presented.


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    Title :

    Effect of Front-to-Rear Propeller Spacing on the Interaction Noise of a Model Counterrotation Propeller at Cruise Conditions


    Contributors:

    Publication date :

    1987


    Size :

    18 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English