Cavitation on a scaled-down model of a Francis turbine guide vane: high-speed imaging and PIV measurements; Journal of Physics: Conference Series; Vol. 656, conference 1 : 9th International Symposium on Cavitation (CAV2015)

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

Dades bibliogràfiques
Parent link:Journal of Physics: Conference Series
Vol. 656, conference 1 : 9th International Symposium on Cavitation (CAV2015).— 2015.— [4 p.]
Autor corporatiu: Национальный исследовательский Томский политехнический университет (ТПУ) Энергетический институт (ЭНИН) Кафедра парогенераторостроения и парогенераторных установок (ПГС и ПГУ)
Altres autors: Pervunin K. S., Timoshevsky M. V., Churkin S. A., Kravtsova A. Yu., Markovich D. M. Dmitry Markovich, Khanjyalich K.
Sumari:Title screen
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.
Режим доступа: по договору с организацией-держателем ресурса
Idioma:anglès
Publicat: 2015
Matèries:
электронный ресурс
труды учёных ТПУ
кавитация
турбины
высокоскоростная визуализация
PIV
Accés en línia:http://dx.doi.org/10.1088/1742-6596/656/1/012166
Format: Electrònic Capítol de llibre
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=649184

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