Experimental and numerical study of the cavitation surge passive control around a semi-circular leading-edge flat plate
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ORIGINAL ARTICLE
Experimental and numerical study of the cavitation surge passive control around a semi‑circular leading‑edge flat plate Ebrahim Kadivar1 · Mikhail V. Timoshevskiy2,3 · Konstantin S. Pervunin2,3 · Ould el Moctar1 Received: 18 June 2019 / Accepted: 24 November 2019 © The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2019
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. Keywords Multiphase flow · Cavitation surge · Cavitation passive control · Semi-circular leading-edge flat plate · Cavitating-bubble generators
1 Introduction Cavitation surge is one of the destructive types of unsteady cavitation which can occur in different industrial applications such as ship rudder, propeller, hydraulic machinery system and hydroturbines. The cavitation surge-type instabilities can usually appear at the limit between partial cavitating and supercavitating regime. The cavity pattern of this type of cavitation has relatively long sheet cavities * Ebrahim Kadivar ebrahim.kadivar@uni‑due.de 1
Institute of Ship Technology, Ocean Engineering and Transport Systems, University of Duisburg-Essen, 47057 Duisburg, Germany
2
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
3
Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia
(typically 75–100% of a body chord length) as compared to unsteady cloud cavitation that develops when an attached cavity dimension is of the order of half the chord length, Callenaere et al. [1]. In previ
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