Experimental investigation of tornado-like vortex dynamics with swirl ratio: The mean and turbulent flow fields

Pooyan Hashemi Tari, Roi Gurka, Horia Hangan

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

An experimental simulation of tornado-like vortices is conducted in a small tornado vortex simulator in order to study the effect of swirl ratio on flow characteristics. Particle Image Velocimetry (PIV) method is employed to quantitatively determine the tornado-vortex velocity field for swirl ratios ranging from 0.08 to 1. The radial and tangential components of velocity as well as the core radius of the tornado increase with increase in swirl ratio. The location of the maximum radial and tangential velocities is adjacent to the ground where the tornado vortex interacts with the surface. The values of normal and shear turbulent stresses indicate the existence of a laminar core for small swirl. As expected the shear stresses increase with swirl ratio as the vortex becomes turbulent. The highest turbulent production corresponds to the critical case of vortex touchdown.

Original languageEnglish
Pages (from-to)936-944
Number of pages9
JournalJournal of Wind Engineering and Industrial Aerodynamics
Volume98
Issue number12
DOIs
StatePublished - 1 Dec 2010
Externally publishedYes

Keywords

  • Particle Image Velocimetry (PIV)
  • Swirl ratio
  • Tornado-like vortex

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