Numerical simulation analysis and research on inlet and outlet of upper and lower reservoirs of pumped storage power station
The inlet and outlet are pivotal elements of hydropower station water intake structures,and their hydraulic characteristics are essential for reducing head loss.To mitigate the impact of head loss caused by adverse factors such as air entrainment vortices and reverse flow during inflow and outflow,a three-dimensional mathematical model was uti-lized for numerical simulation and analysis.Key evaluation indicators encompassed the flow patterns at the inlet/outlet,the distribution ratio of flow among channels,the uniformity of flow velocity distribution at the trash rack cross-section,and head loss.This study validated and optimized the layout and geometry of the inlet and outlet for the upper and lower reservoirs of the Shitai Pumped Storage Power Station in Anhui Province.A recommended scheme was proposed based on the findings.The results demonstrated that the optimized scheme significantly improved the flow conditions at the inlet and outlet,enhanced the uniformity of flow velocity,and reduced head loss.It was found that ① The distribution ratios of flow among channels during inflow and outflow were 20.58％to 30.45％and 20.8％to 27.91％,respectively.The flow uniformity of the adjacent edges and middle channel remained below 10％,indicating smooth flow conditions without ad-verse flow patterns such as air entrainment vortices or strong backflow.② The flow velocities within each channel and the distribution of flow between channels exhibited high uniformity,with the non-uniformity coefficient of the trash rack cross-section during inflow being below 1.5,and during outflow being less than 2.0,thus meeting relevant regulatory requirements.③The head loss coefficients during inflow ranged from 0.28 to 0.30,and during outflow from 0.44 to 0.46,all complying with specifications.The research outcomes can serve as a reference for similar engineering projects design.
mathematical modelflow patterndiversion ratioflow rate distribution uniformityhead lossShitai Pumped Storage Power Station
万方数据
维普
