SUPPRESSION OF VORTEX SHEDDING FROM A CIRCULAR CYLINDER BY INTERNAL ACOUSTIC EXCITATION

This paper reports on an experiment on the suppression of vortex shedding from a circular cylinder by internal acoustic excitation. The experiment was performed in a wind tunnel, the Reynolds numbers were in a range from 4000 to 8000, and the pure- tone sound at the natural vortex-shedding frequencies was introduced into the flow through thin slit on the cylinder surface. It was found that vortex shedding can be suppressed by the excitation at appropriate sound levels; for a given flow condition there is an optimal sound level for the maximum suppression of the vortex shedding. This optimal excitation level is generally very weak (<80 dB), compared with the reported values which must be greater than 120 dB in order to have significant influence on wakes. The results also show that for a given Reynolds number, only in a very narrow excitation range in which the optimal sound level is located, is the vortex-shedding peak significantly reduced. Out of this range the excitation will not be able to reduce the vortex shedding.

  • Supplemental Notes:
    • J Fluids and Structures, v 9 n 5, July 1995, p 563 [8 p, 8 ref, 7 fig]
  • Authors:
    • Huang, X Y
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717516
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM