A numerical study of jet noise mechanisms: Sound scattering by turbulence

J. B. Freund, T. G. Fleischman

Research output: Contribution to conferencePaperpeer-review

Abstract

Results of an ongoing effort to quantify the role turbulence in scattering sound in jets are reported. Using a direct numerical simulation database to providethe flow data, ray paths traced through the mean flow are compared with those traced through the actual time dependent turbulent flow. Significant scattering by the turbulence is observed. The most notable effect is that upstream traveling waves that are trapped in the potential core by the mean flow, which acts as a wave guide, easily escape in the turbulent flow. A crude statistical estimate based on ray number density suggests that directivity is modified substantially by the turbulence, but no rigorous treatment of non-uniformities in the high-frequency approximation is attempted.

Original languageEnglish (US)
DOIs
StatePublished - 2001
Externally publishedYes
Event39th Aerospace Sciences Meeting and Exhibit 2001 - Reno, NV, United States
Duration: Jan 8 2001Jan 11 2001

Other

Other39th Aerospace Sciences Meeting and Exhibit 2001
CountryUnited States
CityReno, NV
Period1/8/011/11/01

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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