Improvement of TNO type trailing edge noise models

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Abstract

The paper describes an improvement of the so-called TNO model to predict the noise emission from aerofoil sections due to the interaction of the boundary layer turbulence with the trailing edge. The surface pressure field close to the trailing edge acts as source of sound in the TNO model. It is computed by solving a Poisson equation which includes flow turbulence cross correlation terms. Previously published TNO type models used the assumption of Blake to simplify the Poisson equation. This paper shows that the simplification should not be used. We present a new model which fully models the turbulence cross correlation terms. The predictions of the new model are in better agreement with measurements of the
surface pressure and far field sound spectra. The computational cost of the new model is only slightly higher than the one of the TNO model, because we derived an analytical solution for the turbulence cross correlation terms.
Original languageEnglish
Title of host publicationProceedings of 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
Number of pages9
Publication date2016
Publication statusPublished - 2016
Event16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery - Honolulu, Hawaii, United States
Duration: 10 Apr 201615 Apr 2016

Conference

Conference16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
CountryUnited States
CityHonolulu, Hawaii
Period10/04/201615/04/2016

Keywords

  • Trailing edge noise
  • TNO model

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