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Record Details

Record 24 of 4206
Lateral noise attenuation of the advanced propeller of the propfan test assessment aircraft
Author and Affiliation:
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)
Abstract: Lateral 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).
Publication Date: Apr 01, 1989
Document ID:
19890048846
(Acquired Nov 28, 1995)
Accession Number: 89A36217
Subject Category: ACOUSTICS
Report/Patent Number: AIAA PAPER 89-1057
Document Type: Preprint
Publisher Information: United States
Contract/Grant/Task Num: NAS3-24339
Financial Sponsor: NASA; United States
Organization Source: Lockheed Aeronautical Systems Co.; Marietta, GA, United States
Description: 9p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACOUSTIC ATTENUATION; ACOUSTIC PROPAGATION; AIRCRAFT NOISE; NOISE PREDICTION (AIRCRAFT); PROP-FAN TECHNOLOGY; AIRPORTS; FLIGHT TESTS; MICROPHONES; RESEARCH AIRCRAFT
Imprint And Other Notes: AIAA, Aeroacoustics Conference, 12th, San Antonio, TX, Apr. 10-12, 1989. 9 p.
Availability Source: Other Sources
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