Numerical investigation of unsteady characteristics of a pump turbine under runaway condition

Doi:https://doi.org/10.1016/j.renene.2021.01.063

1.Unsteady flow and fluctuations of a pump turbine under runaway condition are studied.Flow separation and vortices cause energy dissipation in vaneless region and runner.

2.Vortex motion greatly affects pressure fluctuation in vaneless region.

3.Interaction between blade and vortex causes pressure fluctuation frequency in runner.