A theoretical model for the prediction of unsteady distortion noise

S. J. Majumdar, N. Peake

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


The interaction between atmospheric turbulence drawn towards an aeroengine and the fan can provide a significant contribution to the resulting radiated noise, under both static testing and in-flight conditions. We describe an analytically-based prediction scheme that is able to determine the radiated noise arising from the intake of an arbitrary form of free-stream turbulence. Our approach is modular, and involves the calculation of the stretching of turbulent eddies as they enter the engine, followed by the evaluation of the unsteady forces exerted on the rotor blades. The final stage of our model is the calculation of noise scattered to the far field. We present the theory and predicted results for the two cases of an unducted and ducted fan. Initial results highlight the differences between static and flight conditions, and the role of the key parameters in the calculation of radiated noise. The theoretical noise prediction scheme can be adapted in a straightforward manner to include more realistic distortion fields and engine geometries.

Original languageEnglish (US)
StatePublished - 1996
Externally publishedYes
Event2nd AIAA/CEAS Aeroacoustics Conference, 1996 - State College, United States
Duration: May 6 1996May 8 1996


Other2nd AIAA/CEAS Aeroacoustics Conference, 1996
Country/TerritoryUnited States
CityState College

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Aerospace Engineering


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