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Axial plus tangential entry swirling jet

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Abstract

This paper presents an experimental investigation on swirling jets with well-defined initial conditions. The axial, radial, and azimuthal velocity components, with their respective fluctuations were measured using high spatial–resolution particle image velocimetry. These detailed measurements allow the initial conditions of the swirling jets to be established and the jets to be characterized using various swirl number definitions. The significance of each term in the swirl number calculations are quantified, and the effect of the common assumptions and simplifications are examined. The characteristics of the jets in relation to the initial conditions are then investigated and compared with the previous studies using similar characterization parameters. Jets with Reynolds number of approximately 5700 and swirl conditions ranging from a non-swirling reference case to high swirl are studied. General properties of swirling jets such as higher spreading rate, higher centerline velocity decay, and higher turbulence level are observed. When the degree of swirl is sufficiently high, vortex breakdown occurs. A swirl number of 0.94 is recorded for a high swirl case prior to vortex breakdown, much higher than the critical swirl number reported in the literature. This behavior is attributed to the effect of the initial conditions on the swirl number calculation.

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Acknowledgments

The authors are grateful for ARC LIEF scheme for funding the equipment.

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Authors and Affiliations

  1. Laboratory for Turbulence Research in Aerospace and Combustion, Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Melbourne, VIC, 3800, Australia

    Ing Kiet Toh, Damon Honnery & Julio Soria

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  1. Ing Kiet Toh
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  2. Damon Honnery
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  3. Julio Soria
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Correspondence to Damon Honnery.

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Toh, I.K., Honnery, D. & Soria, J. Axial plus tangential entry swirling jet. Exp Fluids 48, 309–325 (2010). https://doi.org/10.1007/s00348-009-0734-2

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  • DOI: https://doi.org/10.1007/s00348-009-0734-2

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