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Experimental analysis of tip vortex cavitation mitigation by controlled surface roughness

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Abstract

This study presents results of experiments where roughness applications are evaluated in delaying the tip vortex cavitation inception of an elliptical foil. High-speed video recordings and laser doppler velocimetry (LDV) measurements are employed to provide further details on the cavitation behavior and tip vortex flow properties in different roughness pattern configurations. The angular momentum measurements of the vortex core region at one chord length downstream of the tip indicate that roughness leads to a lower angular momentum compared with the smooth foil condition while the vortex core radius remains similar in the smooth and roughened conditions. The observations show that the cavitation number for tip vortex cavitation inception is reduced by 33% in the optimized roughness pattern compared with the smooth foil condition where the drag force increase is observed to be around 2%. During the tests, no obvious differences in the cavitation inception properties of uniform and non-uniform roughness distributions are observed. However, the drag force is found to be higher with a non-uniform roughness distribution.

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Acknowledgements

This work was supported by the VINNOVA through the RoughProp project (Grant No. 2018-04085). The experimental measurements are conducted in the free surface cavitation tunnel at the Kongsberg Hydrodynamic Research Center, Kristinehamn, Sweden.

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Authors and Affiliations

  1. Kongsberg Hydrodynamic Research Centre, Kongsberg Maritime AB, Kristinehamn, Sweden

    Urban Svennberg & Robert Gustafsson

  2. Department of Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg, Sweden

    Abolfazl Asnaghi & Rickard E. Bensow

Authors
  1. Urban Svennberg
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  2. Abolfazl Asnaghi
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  3. Robert Gustafsson
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  4. Rickard E. Bensow
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Corresponding author

Correspondence to Rickard E. Bensow.

Additional information

Biography: Urban Svennberg (1967-), Male, Ph. D.

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Svennberg, U., Asnaghi, A., Gustafsson, R. et al. Experimental analysis of tip vortex cavitation mitigation by controlled surface roughness. J Hydrodyn 32, 1059–1070 (2020). https://doi.org/10.1007/s42241-020-0073-6

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  • DOI: https://doi.org/10.1007/s42241-020-0073-6

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