Experimental and Computational Fluid Dynamics Study of the Flow Field of a Model Pump Turbine

The pumped storage unit has a hump area and S characteristics during operation. operating conditions of the are complex, it is necessary to switch between working conditions. frequently crosses characteristic area, thus hindering connect grid. Severe vibration affects safe stable operation power station. With joint efforts industry, impact S-shaped problems on project commissioning been fundamentally resolved, but mechanism inducing not yet well established. Therefore, in this study, particle image velocity measurement method based full-characteristic test was adopted. According unit, 32 points with four guide-vane opening degrees were selected flow pattern vaneless space. After subtracting average velocity, vortex leafless obtained, which provided reference for design runner water pump turbine.