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Sound Radiation From Two Side-by-Side Rectangular Cylinders With Slightly Different Aspect Ratios

[+] Author Affiliations
Ressa Octavianty, Masahito Asai

Tokyo Metropolitan University, Hino, Japan

Paper No. AJKFluids2015-12058, pp. V01AT12A001; 4 pages
doi:10.1115/AJKFluids2015-12058
From:
  • ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
  • Volume 1A: Symposia, Part 2
  • Seoul, South Korea, July 26–31, 2015
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5721-3
  • Copyright © 2015 by JSME

abstract

Sound radiation from two side-by-side rectangular cylinders, one of which had a square cross-section and the other had a rectangular cross-section with aspect ratio AR = 1.2 to 1.5, was examined experimentally at Reynolds numbers Re = 1.0 × 104 - 3.3 × 104 in low Mach number flows. The center-to-center distance between two cylinders T/D was 3.6, 4.5 and 6.0. When the center-to-center distance was small, T/d = 3.6, vortex streets from two different cylinders were synchronized with the same frequency as that for a pair of identical square cylinders, even for the cylinder pair of ARs = 1.0 and 1.5. Sound radiation was dipole-like (planar-anti-symmetric), unlike in the case of square-cylinders-pair where sound radiation was in-phase. For larger cylinder spacing T/d = 6, highly modulated sound was radiated with two different frequencies due to non-synchronized vortex shedding from two cylinders.

Copyright © 2015 by JSME
Topics: Sound , Cylinders

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