TY - JOUR

T1 - Turbulent Structure of Cavitating Flow

T2 - PIV Measurements over a Model of Guide Vane of Hydraulic Turbine

AU - Timoshevskiy, M. V.

AU - Ilyushin, B. B.

AU - Pervunin, K. S.

N1 - Funding Information: The analysis of the turbulent structure of cavitating flow was funded by the Russian Science Foundation (project no. 19-79-30075). The experiment on the cavitating hydrofoil was carried out under a state contract with IT SB RAS. Publisher Copyright: © 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/7/1

Y1 - 2020/7/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85094656940&partnerID=8YFLogxK

U2 - 10.1134/S1810232820030054

DO - 10.1134/S1810232820030054

M3 - Article

AN - SCOPUS:85094656940

VL - 29

SP - 407

EP - 413

JO - Journal of Engineering Thermophysics

JF - Journal of Engineering Thermophysics

SN - 1810-2328

IS - 3

ER -