Flow around a cylinder at the beginning of the critical region

K. G. Dobrosel’skii

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4 Citations (Scopus)

Abstract

Results of experiments with a turbulent flow around a transversely aligned circular cylinder located at identical distances from the walls of a rectangular channel are reported. Data on averaged velocity fields around the cylinder are obtained by means of particle image velocimetry (PIV). Based on these fields, the near wake behind the cylinder is studied, and the kinematic characteristics for flow regimes with and without cavitation are compared. Based on the vector fields of averaged velocity, the angles of separation of the boundary layer from the cylinder surface in the considered flow regimes are determined. The drag coefficients of the cylinder for different flow regimes are calculated. It is demonstrated that the vortex region behind the cylinder and the drag coefficient of the cylinder increase in the case with cavitation. It is also shown that vortex shedding from the cylinder may be irregular, despite the fact that this process is quasi-periodic for most of the time.

Original languageEnglish
Pages (from-to)293-299
Number of pages7
JournalJournal of Applied Mechanics and Technical Physics
Volume57
Issue number2
DOIs
Publication statusPublished - 1 Mar 2016

Keywords

  • boundary layer
  • cavitation
  • cylinder
  • drag coefficient
  • hydrodynamic testbench
  • PIV

State classification of scientific and technological information

  • 30 MECHANICS

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