Numerical Study of the Internal Fluid Dynamics of Draft Tube in Seawater Pumped Storage Hydropower Plant

Pumped storage hydropower plants are renewable energy systems that effective in saving and solving electricity peak-on shortage. Seawater pumped a novel type of plant specifically supplying electric power for ocean islands with the support solar wind energy. Compared traditional constructed on mainland, seawater should take influence complex marine environment, such as extreme waves winds, into consideration. Taking characteristics near East China Sea an example, we explored transient hydraulic draft tube pump turbine under wave disturbance using sliding grid interface detached eddy simulation (DES) turbulence model. By analyzing unsteady flow tube, vortex Q criterion, frequency pressure pulsation, evolution law internal fluid, propagation pulsation were explored. For situation without disturbance, obvious eccentric straight cone section was observed case where opening guide vane small. With increase vane, gradually dissipated. main equaled maximum at selected monitoring points increased 5 to 15 times, superposition signals produced more low-frequency, high-amplitude signals. Even though spectrum varied lot, domain still existed. In addition, merely tube. The distribution relatively results can provide reference operation plants.