Cavitation on a scaled-down model of a Francis turbine guide vane: high-speed imaging and PIV measurements

9th International Symposium on Cavitation

Pervunin, K.S.^1,2 ; Timoshevskiy, M.V.^1,2 ; Churkin, S.A.^1,2 ; Kravtsova, A.Yu.^1,2 ; Markovich, D.M.^1,2,3 ; Hanjali, K.^2,4

Kutateladze Institute of Thermophysics, SB RAS, 1, Lavrentyev Ave., Novosibirsk

630090, Russia^1

Department of Physics, Novosibirsk State University, 2, Pirogov Str., Novosibirsk

630090, Russia^2

Institute of Power Engineering, Tomsk Polytechnic University, 30, Lenin Ave., Tomsk

634050, Russia^3

Department of Chemical Engineering, Delft University of Technology, 136, Julianalaan, Delft

2628 BL, Netherlands^4

关键词: Angle of Incidence;    Cavitation inception;    Fluctuating velocities;    High speed imaging;    High-speed visualization;    Spanwise variations;    Turbine guide vane;    Velocity fluctuations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012166/pdf
DOI  :  10.1088/1742-6596/656/1/012166

来源: IOP

【 摘 要 】

Cavitation on two symmetric foils, a NACA0015 hydrofoil and a scaled-down model of a Francis turbine guide vane (GV), was investigated by high-speed visualization and PIV. At small attack angles the differences between the profiles of the mean and fluctuating velocities for both hydrofoils were shown to be insignificant. However, at the higher angle of incidence, flow separation from the GV surface was discovered for quasi-steady regimes including cavitation-free and cavitation inception cases. The flow separation leads to the appearance of a second maximum in velocity fluctuations distributions downstream far from the GV surface. When the transition to unsteady regimes occurred, the velocity distributions became quite similar for both foils. Additionally, for the GV an unsteady regime characterized by asymmetric spanwise variations of the sheet cavity length along with alternating periodic detachments of clouds between the sidewalls of the test channel was for the first time visualized. This asymmetric behaviour is very likely to be governed by the cross instability that was recently described by Decaix and Goncalvès [8]. Moreover, it was concluded that the existence of the cross instability is independent on the test body shape and its aspect ratio.