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Sound generation and radiation from rotor tip-vortex pairing phenomenon

Sound generation and radiation from rotor tip-vortex pairing phenomenon
Sound generation and radiation from rotor tip-vortex pairing phenomenon
Sound generation and radiation from rotor tip-vortex pairing are calculated numerically. Wake geometries of a two-bladed rotor in axial flights are calculated using a time-marching free-wake method without a nonphysical model of the far wake. The acoustic field can be obtained using acoustic analogy. To show the accuracy of the flow calculation scheme, the tip-vortex geometries of the present calculation are compared with those done in the previous publication of a small-scaled rotor experiment. The accuracy of the vortex sound calculation scheme is validated by comparing its numerical and the analytic solution of circular vortex-ring interaction. The tip-vortex pairing consists of a turn of the tip-vortex from one blade rolling around the tip-vortex from the other blade. The tip-vortex pairing amplifies the noise and generates new dominant frequencies. The tip-vortex pairing noise has a quadrupole directivity pattern, and it is especially dominant in the direction of the rotation axis. The peak components of the noise spectrum represent the pairing period and an instability mode.
0001-1452
1181-1187
Chung, K.H.
9a58f1dd-c917-4d62-a6e1-b263cf05b8ee
Kim, J.W.
fedabfc6-312c-40fd-b0c1-7b4a3ca80987
Ryu, K.W.
564bc200-e254-4135-a5a5-840bd37b6344
Lee, K.T.
be21295b-9e57-4c3d-a592-56fff1b63cc0
Lee, D.J.
07e9aeba-8cdd-4476-bd03-b936bc2ca8c1
Chung, K.H.
9a58f1dd-c917-4d62-a6e1-b263cf05b8ee
Kim, J.W.
fedabfc6-312c-40fd-b0c1-7b4a3ca80987
Ryu, K.W.
564bc200-e254-4135-a5a5-840bd37b6344
Lee, K.T.
be21295b-9e57-4c3d-a592-56fff1b63cc0
Lee, D.J.
07e9aeba-8cdd-4476-bd03-b936bc2ca8c1

Chung, K.H., Kim, J.W., Ryu, K.W., Lee, K.T. and Lee, D.J. (2006) Sound generation and radiation from rotor tip-vortex pairing phenomenon. AIAA Journal, 44 (6), 1181-1187.

Record type: Article

Abstract

Sound generation and radiation from rotor tip-vortex pairing are calculated numerically. Wake geometries of a two-bladed rotor in axial flights are calculated using a time-marching free-wake method without a nonphysical model of the far wake. The acoustic field can be obtained using acoustic analogy. To show the accuracy of the flow calculation scheme, the tip-vortex geometries of the present calculation are compared with those done in the previous publication of a small-scaled rotor experiment. The accuracy of the vortex sound calculation scheme is validated by comparing its numerical and the analytic solution of circular vortex-ring interaction. The tip-vortex pairing consists of a turn of the tip-vortex from one blade rolling around the tip-vortex from the other blade. The tip-vortex pairing amplifies the noise and generates new dominant frequencies. The tip-vortex pairing noise has a quadrupole directivity pattern, and it is especially dominant in the direction of the rotation axis. The peak components of the noise spectrum represent the pairing period and an instability mode.

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More information

Published date: 2006
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 41434
URI: https://eprints.soton.ac.uk/id/eprint/41434
ISSN: 0001-1452
PURE UUID: 92c73dc0-93f4-4bcd-9162-3c0ebe65217d
ORCID for J.W. Kim: ORCID iD orcid.org/0000-0003-0476-2574

Catalogue record

Date deposited: 07 Sep 2006
Last modified: 06 Jun 2018 12:42

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Contributors

Author: K.H. Chung
Author: J.W. Kim ORCID iD
Author: K.W. Ryu
Author: K.T. Lee
Author: D.J. Lee

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