New results on the structure of turbulence in a mixing layer with and without swirl

Samuel Davoust; Laurent Jacquin; Benjamin Leclaire

doi:10.1016/j.ijheatfluidflow.2014.05.012

New results on the structure of turbulence in a mixing layer with and without swirl

Samuel Davoust, Laurent Jacquin, Benjamin Leclaire

ONERA Office National d'Etudes et Recherches Aerospatiales

Research output: Contribution to journal › Article › peer-review

Abstract

The near field of a 2.14×10⁵ Reynolds number, low-Mach-number, cylindrical jet with and without swirl has been investigated by high-speed stereo PIV in a transverse plane, two diameters downstream of the jet exit. Using spatiotemporal correlations, we investigate the dynamics of streamwise vorticity in the shear layer, responsible for the mixing properties of the jet, and show how swirl affects this vorticity. A dynamical scenario is proposed, which explains how the mean shear and the azimuthal m=0 vortices contribute to the spatial organization observed.

Original language	English
Pages (from-to)	11-17
Number of pages	7
Journal	International Journal of Heat and Fluid Flow
Volume	49
Issue number	C
DOIs	https://doi.org/10.1016/j.ijheatfluidflow.2014.05.012
Publication status	Published - 1 Jan 2014
Externally published	Yes

Keywords

High-speed piv
Mixing layer
Mixing layer turbulence
Swirl

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10.1016/j.ijheatfluidflow.2014.05.012

Cite this

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title = "New results on the structure of turbulence in a mixing layer with and without swirl",

abstract = "The near field of a 2.14×105 Reynolds number, low-Mach-number, cylindrical jet with and without swirl has been investigated by high-speed stereo PIV in a transverse plane, two diameters downstream of the jet exit. Using spatiotemporal correlations, we investigate the dynamics of streamwise vorticity in the shear layer, responsible for the mixing properties of the jet, and show how swirl affects this vorticity. A dynamical scenario is proposed, which explains how the mean shear and the azimuthal m=0 vortices contribute to the spatial organization observed.",

keywords = "High-speed piv, Mixing layer, Mixing layer turbulence, Swirl",

author = "Samuel Davoust and Laurent Jacquin and Benjamin Leclaire",

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AU - Davoust, Samuel

AU - Jacquin, Laurent

AU - Leclaire, Benjamin

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N2 - The near field of a 2.14×105 Reynolds number, low-Mach-number, cylindrical jet with and without swirl has been investigated by high-speed stereo PIV in a transverse plane, two diameters downstream of the jet exit. Using spatiotemporal correlations, we investigate the dynamics of streamwise vorticity in the shear layer, responsible for the mixing properties of the jet, and show how swirl affects this vorticity. A dynamical scenario is proposed, which explains how the mean shear and the azimuthal m=0 vortices contribute to the spatial organization observed.

AB - The near field of a 2.14×105 Reynolds number, low-Mach-number, cylindrical jet with and without swirl has been investigated by high-speed stereo PIV in a transverse plane, two diameters downstream of the jet exit. Using spatiotemporal correlations, we investigate the dynamics of streamwise vorticity in the shear layer, responsible for the mixing properties of the jet, and show how swirl affects this vorticity. A dynamical scenario is proposed, which explains how the mean shear and the azimuthal m=0 vortices contribute to the spatial organization observed.

KW - High-speed piv

KW - Mixing layer

KW - Mixing layer turbulence

KW - Swirl

U2 - 10.1016/j.ijheatfluidflow.2014.05.012

DO - 10.1016/j.ijheatfluidflow.2014.05.012

M3 - Article

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SN - 0142-727X

VL - 49

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EP - 17

JO - International Journal of Heat and Fluid Flow

JF - International Journal of Heat and Fluid Flow

IS - C

ER -

New results on the structure of turbulence in a mixing layer with and without swirl

Abstract

Keywords

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