Analyzing Interaction Noise from a Small Contra-Rotating Fan Enclosed with Lined and Unlined Casings
Publication: Journal of Aerospace Engineering
Volume 34, Issue 4
Abstract
The interaction noise that radiates from ducted contra-rotating (CR) fans are theoretically characterized using Green’s analytical functions for lined and unlined circular ducts containing uniform mean flow. The derived models can be used to analyze the spectral characteristics and directivity patterns of noise in various modes. The axial wavenumbers determining modal propagation are treated numerically with the specified boundary conditions. The solved results show that for each cut-on mode, an imaginary part is added to the axial wavenumber, while for the cutoff mode, the already-existing imaginary part is increased. Therefore, it is indicated that both types of modes will attenuate as they propagate along the lined casing, whereas the modes at higher frequencies experience more noise attenuations than those at lower frequencies, which is experimentally verified. Meanwhile, the discrepancy between predicted and experimental results in terms of noise reduction can also be found and is probably due to near-field source modification resulting from the recasting of the tip-clearance flow. Furthermore, the modal directivity patterns of the interaction tone at 2,332 Hz have been investigated. In theory, the lined casing makes the directivity pattern thinner and lean more to the rotation axis than the one with the unlined casing. For both types of casings, the variation trends in experiments are accurately captured by theoretical predictions. The current study is anticipated to improve the understanding of the underlying mechanisms of interaction noise as well as provide an essential reference for devising noise control methods for ducted CR fans.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The first author would like to acknowledge the support from China Aerodynamics Research and Development Center (CARDC) and the University of Hong Kong (HKU). This work is also sponsored by the National Natural Science Foundation of China (Grant No. 51775467).
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Published In
Journal of Aerospace Engineering
Volume 34 • Issue 4 • July 2021
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© 2021 American Society of Civil Engineers.
History
Received: Nov 3, 2020
Accepted: Feb 5, 2021
Published online: Apr 21, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 21, 2021
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