Propeller installation effects on turboprop acoustics

Chirico, G., Barakos, G. N. and Bown, N. (2018) Propeller installation effects on turboprop acoustics. Journal of Sound and Vibration, 424, pp. 238-262. (doi:10.1016/j.jsv.2018.03.003)

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Abstract

Propeller installation options for a twin-engined turboprop aircraft are evaluated at cruise conditions, aiming to identify the quieter configuration. Computational fluid dynamics is used to investigate the near-field acoustics and transfer functions are employed to estimate the interior cabin noise. Co-rotating and counter-rotating installation options are compared. The effect of propeller synchrophasing is also considered. The employed method captures the complexity of the acoustic field generated by the interactions of the propeller sound fields among each other and with the airframe, showing also the importance of simulating the whole problem to predict the actual noise on a flying aircraft. Marked differences among the various layouts are observed. The counter-rotating top-in option appears the best in terms of acoustics, the top-out propeller rotation leading to louder noise because of inflow conditions and the occurrence of constructive acoustic interferences. Synchrophasing is shown to be beneficial for co-rotating propellers, specially regarding the interior noise, because of favorable effects in the interaction between the propeller direct sound field and the noise due to the airframe. An angle closer to the maximum relative blade shift was found to be the best choice, yielding, however, higher sound levels than those provided by the counter-rotating top-in layout.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barakos, Professor George and Chirico, Giulia
Authors: Chirico, G., Barakos, G. N., and Bown, N.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Journal of Sound and Vibration
Publisher:Elsevier
ISSN:0022-460X
ISSN (Online):1095-8568
Published Online:14 April 2018
Copyright Holders:Copyright © 2018 Elsevier Ltd.
First Published:First published in Journal of Sound and Vibration 424:238-262
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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