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Lateral noise attenuation of the advanced propeller of the propfan test assessment aircraftLateral noise attenuation characteristics of the advanced propeller are determined using the flight test results of the testbed aircraft, Propfan Test Assessment (PTA), with a single, large-scale propfan. The acoustic data were obtained with an array of ground-mounted microphones positioned at distances up to 2.47 km (8100 feet) to the side of the flight path. The aircraft was flown at a Mach number of 0.31 for a variety of operating conditions. The lateral noise attenuation in a frequency range containing the blade passage frequency of the propeller was found to have positive magnitudes on the propfan side and negative magnitudes on the opposite side. The measured attenuation exhibits a strong dependence upon the elevation angle. The results also display a clear dependence upon the angle at which the propeller and nacelle are mounted on the wing (inflow angle).
Document ID
19890048846
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chambers, F. W.
(Lockheed Aeronautical Systems Co. Marietta, GA, United States)
Reddy, N. N.
(Lockheed Aeronautical Systems Co. Marietta, GA, United States)
Bartel, H. W.
(Lockheed Aeronautical Systems Co. Marietta, GA, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1989
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 89-1057
Accession Number
89A36217
Funding Number(s)
CONTRACT_GRANT: NAS3-24339
Distribution Limits
Public
Copyright
Other

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