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

Pooyan Hashemi Tari; Roi Gurka; Horia Hangan

doi:10.1016/j.jweia.2010.10.001

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 journal › Article › peer-review

85 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 language	English
Pages (from-to)	936-944
Number of pages	9
Journal	Journal of Wind Engineering and Industrial Aerodynamics
Volume	98
Issue number	12
DOIs	https://doi.org/10.1016/j.jweia.2010.10.001
State	Published - 1 Jan 2010
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Civil and Structural Engineering
Renewable Energy, Sustainability and the Environment
Mechanical Engineering

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10.1016/j.jweia.2010.10.001

Cite this

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

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.",

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AU - Hashemi Tari, Pooyan

AU - Gurka, Roi

AU - Hangan, Horia

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AB - 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.

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KW - Tornado-like vortex

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

Abstract

Keywords

ASJC Scopus subject areas

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