Measurement and analysis of acoustic flight test data for two advanced design high speed propeller modelsThe recent test program, in which the SR-2 and SR-3 Prop-Fan models were acoustically tested in flight, is described and the results of analysis of noise data acquired are discussed. The trends of noise levels with flight operating parameters are shown. The acoustic benefits of the SR-3 design with swept blades relative to the SR-2 design with straight blades are shown. Noise data measured on the surface of a small-diameter microphone boom mounted above the fuselage and on the surface of the airplane fuselage are compared to show the effects of acoustic propagation through a boundary layer. Noise level estimates made using a theoretically based prediction methodology are compared with measurements.
Document ID
19840037262
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Brooks, B. M. (United Technologies Corp. Hamilton Standard Div., Windsor Locks, CT, United States)
Mackall, K. G. (NASA Flight Research Center Edwards, CA, United States)