### Abstract

Language | English |
---|---|

Pages | 463-473 |

Number of pages | 11 |

Journal | Journal of Fluid Mechanics |

Volume | 641 |

DOIs | |

Publication status | Published - 1 Dec 2009 |

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### Keywords

- aeroacoustics
- compressible flows

### Cite this

*Journal of Fluid Mechanics*,

*641*, 463-473. https://doi.org/10.1017/S0022112009991972

}

*Journal of Fluid Mechanics*, vol. 641, pp. 463-473. https://doi.org/10.1017/S0022112009991972

**Noise radiation from a ducted rotor in a swirling-translating flow.** / Quaranta, Erika; Drikakis, Dimitris.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Noise radiation from a ducted rotor in a swirling-translating flow

AU - Quaranta, Erika

AU - Drikakis, Dimitris

PY - 2009/12/1

Y1 - 2009/12/1

N2 - This paper investigates the noise radiation produced by a rotor inside a duct, which is convected by a swirling-translating mean flow. The study is based on an extension of Gennaretti's and Morino's boundary element method to the frequency domain for scattering problems in conjunction with a spinning rotor source model in the presence of a swirl flow. The proposed formulation is validated against exact solutions and is further used to investigate the effects of the translating flow Mach number and swirling flow angular velocity on noise radiation to the far field. The scattered sound is highly affected by the convecting mean flow. The modal content of the scattered field increases when increasing the translating flow Mach number, while a swirling flow leads to a reduction of the mode propagation, if co-rotating with respect to the azimuthal order of the spinning source, or an increase of the modal content, if counter-rotating with respect to the source. In general, the mean translating flow moves the main lobes of the directivity patterns downstream, while in some cases the mean swirling flow neglects this effect and the downstream lobe is completely shifted.

AB - This paper investigates the noise radiation produced by a rotor inside a duct, which is convected by a swirling-translating mean flow. The study is based on an extension of Gennaretti's and Morino's boundary element method to the frequency domain for scattering problems in conjunction with a spinning rotor source model in the presence of a swirl flow. The proposed formulation is validated against exact solutions and is further used to investigate the effects of the translating flow Mach number and swirling flow angular velocity on noise radiation to the far field. The scattered sound is highly affected by the convecting mean flow. The modal content of the scattered field increases when increasing the translating flow Mach number, while a swirling flow leads to a reduction of the mode propagation, if co-rotating with respect to the azimuthal order of the spinning source, or an increase of the modal content, if counter-rotating with respect to the source. In general, the mean translating flow moves the main lobes of the directivity patterns downstream, while in some cases the mean swirling flow neglects this effect and the downstream lobe is completely shifted.

KW - aeroacoustics

KW - compressible flows

UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-76249133571&partnerID=40&md5=57fefb982b6db93540ee8e2acdbdddae

U2 - 10.1017/S0022112009991972

DO - 10.1017/S0022112009991972

M3 - Article

VL - 641

SP - 463

EP - 473

JO - Journal of Fluid Mechanics

T2 - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

ER -