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Cavitation control using passive flow control techniques

Zaresharif, Mahshid orcid logoORCID: 0000-0003-2213-2365, Ravelet, Florent orcid logoORCID: 0000-0002-1987-5558, Kinahan, David J. orcid logoORCID: 0000-0003-1968-2016 and Delauré, Yan orcid logoORCID: 0000-0002-7151-9278 (2021) Cavitation control using passive flow control techniques. Physics of Fluids, 33 . ISSN 1070-6631

Abstract
Passive flow control techniques, and particularly vortex generators have been used successfully in a broad range of aero- and hydrodynamics applications to alter the characteristics of boundary layer separation. This study aims to review how such techniques can mitigate the extent and impact of cavitation in incompressible flows. This review focuses first on vortex generators to characterize key physical principles. It then considers the complete range of passive flow control technologies, including surface conditioning and roughness, geometry modification, grooves, discharge, injection, obstacles, vortex generators, and bubble generators. The passive flow control techniques reviewed typically delay and suppress boundary layer separation by decreasing the pressure gradient at the separation point. The literature also identifies streamwise vortices that result in the transfer of momentum from the free stream to near-wall low energy flow regions. The area of interest concerns hydraulic machinery, whose performance and life span are particularly susceptible to cavitation. The impact on performance includes a reduction in efficiency and fluctuations in discharge pressure and flow, while cavitation can greatly increase wear of bearings, wearing rings, seals, and impeller surfaces due to excessive vibration and surface erosion. In that context, few studies have also shown the positive effects that passive controls can have on the hydraulic performance of centrifugal pumps, such as total head and efficiency. It is conceivable that a new generation of design in hydraulic systems may be possible if simple design features can be conceived to maximize power transfer and minimize losses and cavitation. There are still, however, significant research gaps in understanding a range of impact factors such as manufacturing processes, lifetime, and durability, and essentially how a static design can be optimized to deliver improved performance over a realistic range of operating conditions.
Metadata
Item Type:Article (Published)
Refereed:Yes
Additional Information:Article number: 121301
Subjects:UNSPECIFIED
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Research Institutes and Centres > National Centre for Sensor Research (NCSR)
Research Institutes and Centres > Advanced Processing Technology Research Centre (APTRC)
Research Institutes and Centres > I-Form
Research Institutes and Centres > Water Institute
Publisher:American Institute of Physics
Official URL:https://dx.doi.org/10.1063/5.0071781
Copyright Information:© 2021 The Authors. Open Access (CC-BY 4.0)
Funders:European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 862100 (NewSkin).
ID Code:27794
Deposited On:27 Sep 2022 10:31 by Thomas Murtagh . Last Modified 27 Sep 2022 10:31
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