Aeroacoustic Imaging Experiments of Airframe Noise in Lined Wall Closed-Section Wind Tunnel
Publication: Journal of Aerospace Engineering
Volume 28, Issue 4
Abstract
Acoustic imaging is an indispensable experimental aid in the design of silent aircraft. In this work, acoustic imaging is performed in a classical closed-section wind tunnel that has been extensively modified using specifically designed liners on the walls of the test section. The details of the associated acoustic modification and the aeroacoustic imaging method are introduced in this paper. The acoustic test performance is carefully evaluated by examining background noise reductions and acoustic beamforming results. The experimental outcomes suggest that the proposed acoustic modification could suppress background noise by 5 dB at test flow speeds. The beamforming results clearly identify the dominant airframe noise sources at landing gears and high-lift devices. The experimental results agree fairly well with the preceding computational and empirical predictions. The proposed acoustic imaging technique has been shown to be an effective experimental technique in identifying airframe noise sources. In addition, the acoustic treatments developed in this paper could be considered in extending the aeroacoustic capabilities of existing closed-section wind tunnels.
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Acknowledgments
This research was supported partially by the National Natural Science Foundation Grant of China (grants 11172007 and 11322222).
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Published In
Journal of Aerospace Engineering
Volume 28 • Issue 4 • July 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 6, 2013
Accepted: Mar 24, 2014
Published online: Jul 23, 2014
Discussion open until: Dec 23, 2014
Published in print: Jul 1, 2015
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