Numerical Simulation Of Hydraulic Characteristics Of Side Inlet/Outlet Of Shangyi Pumped Storage Power Station

The pumped storage power station is currently the most economical large-scale energy storage equipment.It has fast start-up and reliable operation.It undertakes functions such as peak shaving,frequency modulation,and accidental backup,and plays a pivotal role in the power system.The inlet/outlet of the pumped storage power station is an important part of the water delivery system and directly related to the operation efficiency of the power station.Based on the Shangyi pumped storage power station,the numerical simulation method is used to study the hydraulic characteristics of the side inlet/outlet of the upper reservoir.(1)The RNG-6)- turbulence model was used to establish a mathematical model for the side inlet/outlet of a lower reservoir,and the physical model test results were compared with the numerical simulation results.The accuracy and reliability of the numerical simulation were verified.(2)The numerical simulation is carried out for the design of the side inlet/outlet of the upper reservoir of Shangyi Pumped Storage Power Station.In the pumping condition,there is a reverse flow velocity in the upper part of the trash rack section.The unevenness coefficient of the flow velocity of the trash rack is greater than 2,and the flow velocity distribution is not uniform.Under power generation and pumping conditions,the flow distribution of each orifice is not uniform.It does not meet the requirements of hydraulic design and needs to be optimized.(3)Based on the design of the body shape,the orifice size and the mid-hole width ratio are adjusted.The calculation results show that the flow velocity unevenness coefficient of each orifice are significantly lower than the design somatotype under pumping conditions.In the pumping and generating conditions,the flow distribution of each orifice is obviously improved compared with the design somatotype,and the flow distribution is basically uniform to meet the requirements.At the same time,the surface flow pattern of the open channel with the optimized inlet/outlet is studied.(4)The hydraulic characteristics of the side inlet/outlet were simulated under the simultaneous generation and pumping conditions,and the hydraulic characteristics and water exchange phenomenon of the inlet/outlet and open channel under the working conditions were studied.