Data obtained in simulated hovering flight in open environment. Report discusses measurements of sound generated in outdoor hoovering tests of 1/6-scale, four bladed helicopter rotor. Information of delineation between accoustic near field and far field and on effect of simple boundary-layer-tripping device. Also covers rotor accoustics at low thrust and at high thrust.
Acoustical Tests Of A Scale-Model Helicopter Rotor
NASA Tech Briefs ; 12 , 7
1988-07-01
Miscellaneous
No indication
English
Acoustical aspect of helicopter rotor blade flow instabilities
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