Cavitating vortices in the guide vanes region related to the pump-turbine pumping mode rotating stall

HYPERBOLE Symposium 2017 (HYdropower plants PERformance and flexiBle Operation towards Lean integration of new renewable Energies)

Jee, U.^1 ; Skotak, A.^2 ; Mikulaek, J.^2

Litostroj Power D.o.o., Ljubljana, Slovenia^1

KD Blansko Engineering, a.s., Blansko, Czech Republic^2

关键词: Cost-efficient;    High pressure;    High pressure regions;    Local velocity;    Pumping modes;    Recirculation zones;    Reversible pump-turbine;    Rotating stalls;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/813/1/012043/pdf
DOI  :  10.1088/1742-6596/813/1/012043

来源: IOP

【 摘 要 】

Reversible pump-turbines used in Pumped Storage Power Plants are among the most cost-efficient solutions for storing and recovering large amount of energy in short time. Presented paper is focused on the pump-turbine pumping mode part-load instabilities, among them the rotating stall and the cavitating vortex in the distributor region. Rotating stall can be described as a periodic occurrence and decay of the recirculation zones in the distributor with its own rotational characteristics frequency. Unstable behaviour can result in high radial forces, high pressure fluctuations and local velocity fluctuations that can in some cases lead into the occurrence of the cavitating vortex in the distributor region, even though the distributor is located in the high pressure region. Computationally demanding calculations have been performed using commercial CFD code. Analysed results have been compared to the experimental data obtained in the KD Blansko Engineering hydraulic laboratory.