ACTRAN numerical study on the effects of intake geometry and length on fan tone noise propagation and radiation
ACTRAN numerical study on the effects of intake geometry and length on fan tone noise propagation and radiation
In this study, the geometry of a drooped intake of a scale rig for typical turbofan engines is artificially modified to create fictitious shorter intake geometries in order to investigate the impact of the intake length on the forward radiated fan noise. The study has been conducted by using three-dimensional ACTRAN TM models, and computations were performed over a wide range of frequencies. The noise source of interest is buzz-saw tones, hence rotor-locked single mode at the fan plane at integer-multiples of the engine shaft rotation speed at each engine order was used to define the noise source. In parallel, ACTRAN TM predictions by using the axisymmetric models generated based on the sideline profile of the drooped intake have also been performed for comparison and understanding the three-dimensional effect on the radiation directivities.
The ACTRAN results show that the impact of the intake length is quite small if the intake is not acoustically lined. In case of lined intake, however, the far-field directivity can be significantly modified by the change of the intake length.
Turbofan engine noise, Aircraft noise, computational aeroacoustics (CAA), ACOUSTICS, Duct acoustics, flow distortion, PREDICTION
Xiong, Lei
6ea5bfd2-e420-4f38-a78c-c5c345d3869c
Sugimoto, Rie
cb8c880d-0be0-4efe-9990-c79faa8804f0
Quaranta, Erika
4de6c2c7-ed83-4b97-b063-2be41f39a122
October 2018
Xiong, Lei
6ea5bfd2-e420-4f38-a78c-c5c345d3869c
Sugimoto, Rie
cb8c880d-0be0-4efe-9990-c79faa8804f0
Quaranta, Erika
4de6c2c7-ed83-4b97-b063-2be41f39a122
Xiong, Lei, Sugimoto, Rie and Quaranta, Erika
(2018)
ACTRAN numerical study on the effects of intake geometry and length on fan tone noise propagation and radiation.
FFT Acoustic Simulation Conference 2018: Actran Users' Meeting, Radisson Blu Hotel, Toulouse, France.
10 - 11 Oct 2018.
17 pp
.
Record type:
Conference or Workshop Item
(Other)
Abstract
In this study, the geometry of a drooped intake of a scale rig for typical turbofan engines is artificially modified to create fictitious shorter intake geometries in order to investigate the impact of the intake length on the forward radiated fan noise. The study has been conducted by using three-dimensional ACTRAN TM models, and computations were performed over a wide range of frequencies. The noise source of interest is buzz-saw tones, hence rotor-locked single mode at the fan plane at integer-multiples of the engine shaft rotation speed at each engine order was used to define the noise source. In parallel, ACTRAN TM predictions by using the axisymmetric models generated based on the sideline profile of the drooped intake have also been performed for comparison and understanding the three-dimensional effect on the radiation directivities.
The ACTRAN results show that the impact of the intake length is quite small if the intake is not acoustically lined. In case of lined intake, however, the far-field directivity can be significantly modified by the change of the intake length.
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Published date: October 2018
Additional Information:
Presentation only
Venue - Dates:
FFT Acoustic Simulation Conference 2018: Actran Users' Meeting, Radisson Blu Hotel, Toulouse, France, 2018-10-10 - 2018-10-11
Keywords:
Turbofan engine noise, Aircraft noise, computational aeroacoustics (CAA), ACOUSTICS, Duct acoustics, flow distortion, PREDICTION
Identifiers
Local EPrints ID: 426736
URI: http://eprints.soton.ac.uk/id/eprint/426736
PURE UUID: 08b9b80b-4df8-4a77-9792-8b3a5ba246f9
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Date deposited: 11 Dec 2018 17:30
Last modified: 16 Mar 2024 04:03
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Contributors
Author:
Lei Xiong
Author:
Erika Quaranta
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