Noise generation by a subsonic blade row with mean loading

N. Peake, E. J. Kerschen

Research output: Contribution to conferencePaperpeer-review

Abstract

We consider the problem of noise generat.ion by the int.eraction between upstream disturbances, of reduced frequency k, and a blade row. Here, we model just the effects of the blade mean loading by treating the hla,des as flat plates aligned at a nonzero angle of attack, 6, to the oncoming stream, and use asymptot,ic analysis in the realistic limit k >> 1, 6 <(1. Expressions for the upstream radiation are derived by making a consistent asymptotic expansion of the compressible Euler equat.ions, and our approach proceeds using a blend of rapid distortion theory (to treat tlie deformation of tlie disturbances by tlie mean flow), and matched asymptotic expansions (to treat the noise generation in the vicinity of each leading edge). The dependence of the radiation 011 tlie blade mean loading can then be investigated, and it is seen that even a relatively small value of 6 can have a significant effect, thanks to the O(k6) phase changes wbicli are introduced into the radiation components emanating from each leading edge.

Original languageEnglish (US)
StatePublished - 1995
Event33rd Aerospace Sciences Meeting and Exhibit, 1995 - Reno, United States
Duration: Jan 9 1995Jan 12 1995

Other

Other33rd Aerospace Sciences Meeting and Exhibit, 1995
Country/TerritoryUnited States
CityReno
Period1/9/951/12/95

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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