Transport Phenomena - Delft University of Technology

Sorted by YearSorted by First Author

Cavitation on a Scaled-Down Model of a Francis Turbine Guide Vane: High-Speed Imaging and Piv Measurements

Cavitation on a Scaled-Down Model of a Francis Turbine Guide Vane: High-Speed Imaging and Piv Measurements, K. S. Pervunin, M. V. Timoshevskiy, S. A. Churkin, A. Yu Kravtsova, D. M. Markovich, and K. Hanjalic. In 9th International Symposium on Cavitation (Cav2015), pp. 012166, 2015.

Download

[DOI] 

Abstract

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 Goncalvs [8]. Moreover, it was concluded that the existence of the cross instability is independent on the test body shape and its aspect ratio.

BibTeX

@inproceedings{ ISI:000368580600166,
Author = {Pervunin, K. S. and Timoshevskiy, M. V. and Churkin, S. A. and Kravtsova, A. Yu and Markovich, D. M. and Hanjalic, K.},
Book-Group-Author = {IOP},
Title = {Cavitation on a Scaled-Down Model of a Francis Turbine Guide Vane: High-Speed Imaging and Piv Measurements},
Booktitle = {9th International Symposium on Cavitation (Cav2015)},
Series = {Journal of Physics Conference Series},
Year = {2015},
Volume = {656},
Note = {},
Abstract = {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 Goncalvs {[}8]. Moreover, it was concluded that the existence of the cross instability is independent on the test body shape and its aspect ratio.},
DOI = {10.1088/1742-6596/656/1/012166},
Pages = {012166},
ISSN = {1742-6588},
Unique-ID = {ISI:000368580600166},
}

Generated by bib2html.pl (written by Patrick Riley ) on Fri Jul 28, 2017 13:53:00


Last modified: July 28 2017. © Delft University of Technology - TP group 2012