Experimental and numerical study of the cavitation surge passive control around a semi-circular leading-edge flat plate

Ebrahim Kadivar, Mikhail V. Timoshevskiy, Konstantin S. Pervunin, Ould el Moctar

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1010-1023
Number of pages14
JournalJournal of Marine Science and Technology (Japan)
Volume25
Issue number4
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • Cavitating-bubble generators
  • Cavitation passive control
  • Cavitation surge
  • Multiphase flow
  • Semi-circular leading-edge flat plate
  • INSTABILITY
  • MECHANISM
  • WALL ROUGHNESS
  • MODEL
  • AVERAGED NAVIER-STOKES
  • SIMULATION
  • FLOW
  • HIGH-SPEED VISUALIZATION
  • DYNAMICS
  • TURBULENCE

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