Near-field acoustic characteristics of a single-rotor propfanThe near-field noise characteristics of the SR-7L, an eight-blade, single-rotor, wing-mounted, tractor propfan have been determined. It is found that the noise is dominated by discrete tones, usually at the first order (and occasionally at the second or third order) of the blade-passage frequency. The highest noise levels were noted at conditions of high tip helical speeds and high dynamic pressures.
Document ID
19890048844
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bartel, H. W. (Lockheed Aeronautical Systems Co. Marietta, GA, United States)
Swift, G. (Lockheed Aeronautical Systems Co. Marietta, GA, United States)