NDLI: Evaluation of the langley 4- by 7-meter tunnel for propeller noise measurements

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Evaluation of the langley 4- by 7-meter tunnel for propeller noise measurements

Content Provider	NASA Technical Reports Server (NTRS)
Author	Block, P. J. W. Gentry Jr., G. L.
Copyright Year	1984
Description	An experimental and theoretical evaluation of the Langley 4- by 7- Meter Tunnel was conducted to determine its suitability for obtaining propeller noise data. The tunnel circuit and open test section are described. An experimental evaluation is performed using microphones placed in and on the tunnel floor. The reflection characteristics and background noise are determined. The predicted source (propeller) near-field/far-field boundary is given using a first-principles method. The effect of the tunnel-floor boundry layer on the noise from the propeller is also predicted. A propeller test stand used for part of his evaluation is also described. The measured propeller performance characteristics are compared with those obtained at a larger scale, and the effect of the test-section configuration on the propeller performance is examined. Finally, propeller noise measurements were obtained on an eight-bladed SR-2 propeller operating at angles of attack -8 deg, 0 deg, and 4.6 deg to give an indication of attainable signal-to-noise ratios.
File Size	6843295
Page Count	36
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850005244
Archival Resource Key	ark:/13960/t07x1749p
Language	English
Publisher Date	1984-12-01
Access Restriction	Open
Subject Keyword	Acoustics Propellers Wind Tunnels Signal To Noise Ratios Aircraft Noise Far Fields Wind Tunnel Tests Near Fields Wind Tunnel Apparatus Angle of Attack Noise Measurement Boundary Layers Microphones Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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