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Pumped storage technology is a large-scale, efficient, flexible and clean energy storage technology. The core of it is the design of pumped storage units, which involves the operation and flow characteristics of vane hydraulic machinery under pump and turbine modes, as well as the complex flow conditions of the upstream and downstream flow channels of the units. With this as the background, this book expounds on the relevant problems and their solutions, providing a scientific basis for the development of pumped storage technology. I hope this book can provide as a useful reference for readers.

Technology: general issues --- History of engineering & technology --- tip clearance --- vertical axial flow pump --- whole channel numerical simulation --- pressure pulsation --- leakage vortex --- bulb tubular pump --- numerical simulation --- adjusting speed --- transition process --- pressure fluctuation --- pump turbine --- flow energy loss --- flow–head stability --- guide vane opening --- V-inclined pipe --- sand transport --- critical velocity --- flow pattern --- orthogonal test method --- lateral intake --- CFD numerical simulation --- diversion pier --- prefabricated pumping station --- centrifugal pump --- energy characteristics --- internal flow field --- test --- integrated pump gate --- inlet channel --- outlet channel --- hydraulic performance --- “S” shaped airfoil --- bidirectional axial flow pump --- axial flow pumps --- energy --- cavitation --- numerical calculation --- Francis turbine --- sediment erosion --- clearance --- CFD --- n/a --- flow-head stability --- "S" shaped airfoil