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LES of the flow and acoustics generated by an aircraft fan running in the vicinity of the ground

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Author

  • Dragos Moroianu
  • Arne Karlsson
  • Laszlo Fuchs

Summary, in English

An important component of the aircraft generated noise, especially ahead of it, is the fan noise created by the high velocity variation near the blades and the interaction of the rotating fan with the fluid. In order to predict the sound, the method used involves the acoustical analogy developed by Ffowcs Williams and Hawkings. Computation of the flow field is performed in the incompressible LES framework, while the noise is evaluated using a non-homogeneous wave equation. In this work the influence of the angle between the fan and ground, on the total sound spectrum, the noise generation and the noise propagation is investigated. It is found that the near field is dominated by the blade passage frequency and an upward inclination of the fan will produce a slightly different sound pressure level than a horizontal or downward inclination. Copyright

Department/s

Publishing year

2005

Language

English

Pages

1231-1239

Publication/Series

Proceedings of the ASME Turbo Expo

Volume

6 PART B

Document type

Conference paper

Publisher

American Society Of Mechanical Engineers (ASME)

Topic

  • Fluid Mechanics and Acoustics

Keywords

  • LES
  • Acoustical analogy
  • Fan noise

Conference name

ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future

Conference date

2005-06-06 - 2005-06-09

Conference place

Reno-Tahoe, NV, United States

Status

Published