Abstract
In this paper, we performed the numerical and experimental study of unsteady cavitation surge around a semi-circular leading-edge flat plate using a passive flow control method. We mounted a miniature spanwise wedge-type vortex generator on the suction side of the model close to its leading edge. To mitigate the destructive impact of this type of cavitation on the hydrofoil performance, we analyzed the effects of the passive control on the dynamics of cavitation surge. First, we investigated experimentally the unsteady cavitating flow around the semi-circular leading-edge flat plate without passive control using high-speed visualization, acoustic measurements and particle image velocimetry method. Next, we simulated numerically the dynamics of unsteady flow under the cavitation surge conditions with an open source code and validated the numerical results using the experimental data. We used a proper interaction between turbulence and cavitation model to capture a highly unsteady behavior of cavitation surge. Finally, we considered the effects of the passive control device on the mechanism of the cavitation surge instability. Our results revealed that using the passive control method, it is possible to stabilize the attached cavity on the suction side of the flat plate, to hinder the development of the spanwise instability of the attached cavity and to mitigate large-scale cavity structures. Furthermore, high-pressure pulsations in the wake region induced by unsteady cavitation surge were considerably reduced.
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Acknowledgements
The authors would like to thank the support of computer resources by MagnitUDE super-computers at University of Duisburg-Essen. The experiment was carried out with a financial support from the Russian Foundation for Basic Research (Project nos. 17-08-01199 and 18-38-20167) and the government of Novosibirsk region of the Russian Federation (Project no. 18-48-543022). The methods of automatization of data acquisition and processing used in the study were elaborated under the state contract with IT SB RAS (AAAA-A19-119052190039-8). The authors also appreciate useful discussions with Dr. Javadi and are grateful to student Mikhail Nichik for his valuable assistance in performing the experiment.
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Kadivar, E., Timoshevskiy, M.V., Pervunin, K.S. et al. Experimental and numerical study of the cavitation surge passive control around a semi-circular leading-edge flat plate. J Mar Sci Technol 25, 1010–1023 (2020). https://doi.org/10.1007/s00773-019-00697-2
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DOI: https://doi.org/10.1007/s00773-019-00697-2