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Propeller installation effects on turboprop aircraft acoustics.

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Title: Propeller installation effects on turboprop aircraft acoustics.
Authors: Chirico, Giulia1 g.chirico.1@research.gla.ac.uk, Barakos, George N.1 George.Barakos@glasgow.ac.uk, Bown, Nicholas2 Nicholas.Bown@dowty.com
Source: Journal of Sound & Vibration. Jun2018, Vol. 424, p238-262. 25p.
Subjects: Aircraft industry, Propeller-driven aircraft, Computational fluid dynamics, Space cabin atmospheres, Acoustics
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. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Sound & Vibration is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 129073657
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Propeller installation effects on turboprop aircraft acoustics.
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  Data: <searchLink fieldCode="AR" term="%22Chirico%2C+Giulia%22">Chirico, Giulia</searchLink><relatesTo>1</relatesTo><i> g.chirico.1@research.gla.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Barakos%2C+George+N%2E%22">Barakos, George N.</searchLink><relatesTo>1</relatesTo><i> George.Barakos@glasgow.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Bown%2C+Nicholas%22">Bown, Nicholas</searchLink><relatesTo>2</relatesTo><i> Nicholas.Bown@dowty.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Sound+%26+Vibration%22">Journal of Sound & Vibration</searchLink>. Jun2018, Vol. 424, p238-262. 25p.
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  Data: <searchLink fieldCode="DE" term="%22Aircraft+industry%22">Aircraft industry</searchLink><br /><searchLink fieldCode="DE" term="%22Propeller-driven+aircraft%22">Propeller-driven aircraft</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Space+cabin+atmospheres%22">Space cabin atmospheres</searchLink><br /><searchLink fieldCode="DE" term="%22Acoustics%22">Acoustics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Sound & Vibration is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jsv.2018.03.003
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 25
        StartPage: 238
    Subjects:
      – SubjectFull: Aircraft industry
        Type: general
      – SubjectFull: Propeller-driven aircraft
        Type: general
      – SubjectFull: Computational fluid dynamics
        Type: general
      – SubjectFull: Space cabin atmospheres
        Type: general
      – SubjectFull: Acoustics
        Type: general
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      – TitleFull: Propeller installation effects on turboprop aircraft acoustics.
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            NameFull: Chirico, Giulia
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            NameFull: Barakos, George N.
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            NameFull: Bown, Nicholas
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            – D: 23
              M: 06
              Text: Jun2018
              Type: published
              Y: 2018
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              Value: 424
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