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Noise computation of a turbo-engine jet exhaust based on LES and lighthill's acoustic analogy

In English

Författare

Summary, in English

Increasing noise regulations at urban airports force jet engine manufactures to develop and build more quiet engines. Over recent years, a significant reduction in fan and mechanical noise has been achieved. However, the jet exhaust is the principal source of noise. The acoustical field that is generated by a turboengine jet exhaust running near the ground level is considered. The full equations of motion for compressible and unsteady flows describe both flow field and sound generation. The flow variables are decomposed into semi-compressible components and inviscid, irrotational acoustical components. The turbulent flow and mixing are computed using Large Eddy Simulation (LES). The radiated acoustical field is computed using the Lighthill's acoustic analogy with acoustic sources provided by instantaneous LES data.

Avdelning/ar

Publiceringsår

2004

Språk

Engelska

Sidor

1723-1731

Publikation/Tidskrift/Serie

Proceedings of the ASME Turbo Expo 2004

Volym

5 B

Dokumenttyp

Konferensbidrag

Förlag

American Society Of Mechanical Engineers (ASME)

Ämne

  • Fluid Mechanics and Acoustics

Nyckelord

  • Semi-compressible components
  • Acoustic source
  • Noise computation
  • Jet exhaust

Conference name

2004 ASME Turbo Expo

Conference date

2004-06-14 - 2004-06-17

Conference place

Vienna, Austria

Status

Published