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Effects of Periodic Holes on the Suppression of Aeroacoustic Noise From a Pantograph Horn

[+] Author Affiliations
Takehisa Takaishi, Mitsuru Ikeda

Railway Technical Research Institute, Tokyo, Japan

Chisachi Kato

University of Tokyo, Tokyo, Japan

Paper No. FEDSM2003-45464, pp. 41-48; 8 pages
doi:10.1115/FEDSM2003-45464
From:
  • ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
  • Volume 1: Fora, Parts A, B, C, and D
  • Honolulu, Hawaii, USA, July 6–10, 2003
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3696-7 | eISBN: 0-7918-3673-8
  • Copyright © 2003 by ASME

abstract

Three types of pantograph horn model; simple cylinder, a cylinder with periodic holes and a cylinder with a continuous slit, are tested in a low noise wind tunnel to compare their characteristics of aerodynamic noise and flow fields in the wake. Formation of strong vortices of alternate sign that have large structure in the spanwise direction is suppressed due to the flow through holes or the slit. The cylinder with the continuos slit is proved to reduce the noise sufficiently, but an unstable flow through the slit seems to produce distinct noise. Since formation of strong vortices is mainly suppressed due to momentum injection through holes or the slit, periodic holes have little effect on collapsing the spanwise structure of vortices, but they contribute to making the flow around the horn stable. The shape of holes should be optimized to avoid strong acoustic resonance.

Copyright © 2003 by ASME
Topics: Noise (Sound)

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