Turbulent Structure of Cavitating Flow: PIV Measurements over a Model of Guide Vane of Hydraulic Turbine

M. V. Timoshevskiy, B. B. Ilyushin, K. S. Pervunin

Research output: Contribution to journalArticlepeer-review

Abstract

The article presents the results of an experimental study of theturbulent structure of flow over a two-dimensional hydrofoil, which is ascaled-down model of guide vane of high-pressure hydraulic turbine. Thestudy was carried out for four regimes of cavitating flow, covering thecases of cavitation-free flow, quasi-steady sheet-vortex cavity withdetachments of small-scale cavitation clouds, and unsteady cloudcavitation with periodic separation of the whole attached cavity,formation of large-scale cavitation cloud, and its advection.Distributions of the average velocity, turbulent kinetic energy, andfunctional shear stresses are given. The transformation of the turbulentstructure of the flow over the hydrofoil during transition from thecavitation-free flow to the regime of cloud cavitation is analyzed. Flowregions with non-local characteristics of turbulent transport aredetected, where the known semi-empirical gradient-type models used inRANS approaches give qualitatively improper results.

Original languageEnglish
Pages (from-to)407-413
Number of pages7
JournalJournal of Engineering Thermophysics
Volume29
Issue number3
DOIs
Publication statusPublished - 1 Jul 2020

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