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Vortex-Shedding of a Multi-Hole Orifice Synchronized to an Acoustic Cavity in a PWR Water Piping System

[+] Author Affiliations
P. Moussou, S. Caillaud, V. Villouvier

EDF, Clamart Cédex, France

A. Archer, A. Boyer

EDF, Chatou Cédex, France

B. Rechu, S. Benazet

EDF, Marseille Cédex, France

Paper No. PVP2003-2086, pp. 161-168; 8 pages
  • ASME 2003 Pressure Vessels and Piping Conference
  • Flow-Induced Vibration
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4156-1
  • Copyright © 2003 by ASME


Due to a new design, a multi-hole orifice was arranged on the Spent Fuel Pit Cooling system (SFPC) of a French nuclear power plant. Serious pipe vibrations and a high level of noise were generated during the qualification testing. On-site measurements showed that a pure tone appeared at 640 Hz for a precise value of the mean flow. Furthermore, when the multi-hole orifice was replaced by another one with a different set of holes, the pure tone frequency was shifted to 520 Hz. The Strouhal number of the orifice holes is close to unity in the high-vibration regime. Besides, the acoustic boundary conditions appear highly reflecting. A fully-coupled finite element analysis of the piping system shows that several natural modes in the 500–700 Hz range exhibit simultaneously a shell deformation of the orifice, a pattern of plane acoustic waves upstream the orifice and a shell deformation of the piping system. The phenomenon is explained as a lock-in between vortex shedding inside the multi-hole orifice and the acoustic cavity, enhancing shell deformation of the pipe.

Copyright © 2003 by ASME



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