Water, Год журнала: 2024, Номер 16(23), С. 3443 - 3443

Опубликована: Ноя. 29, 2024

As the central component of a pumped storage power station, pump-turbine frequently enters hump region during operation, which impacts safe functioning unit. This study investigates flow patterns at various guide vane openings within area, employing Omega vortex identification method. The results reveal that transitioning into from design conditions in an unsteady state vaneless space, seriously threatening stability pump-turbine. Notably, lowest point zone, space generates high-speed circulation characterized by large velocity gradients and severe separation. high turbulent kinetic energy intensifies with increasing opening. Additionally, low-frequency pressure pulsations become predominant frequency relative amplitude these reach higher values, is caused rotating stall. technique illustrates structure minimized optimal efficiency space. rate decreases, persistent high-energy vortices accumulate resulting significant increase vorticity intensity causing pump turbine.

Язык: Английский