The case for full-scale acoustic testing of propulsion systems at flight conditions and the use of wind tunnels for this work are discussed. The problems associated with measuring noise in wind tunnels are discussed, and wind-tunnel design requirements to provide a useful facility for noise research are established. Full-scale subsonic wind-tunnel designs that meet the requirements are described, and it is shown that state-of-art acoustics technology must be used in the drive-fan design to minimize background noise. If this is successfully done, acoustic treatment in the drive system area may be avoided.
Aspects of large-scale, subsonic, wind-tunnel design for propulsion noise research
Propulsion Conference ; 1973 ; Las Vegas, NV, US
1973-11-01
Conference paper
No indication
English
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