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Research on the influence of Water Pipelines on the Transition Process of Variable-speed Pump Turbines
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Journal Article
Research on the influence of Water Pipelines on the Transition Process of Variable-speed Pump Turbines
2025
Overview
The pump-turbine is the core equipment of the pumped storage system. The dynamic coupling effect between the flow channel and the water delivery system during variable-speed operation is a crucial factor that contributes to flow instability. This paper investigates the effects of water pipelines on the variable-speed operation of pump-turbines. Based on a 1D-3D unsteady numerical simulation method, the unsteady flow evolution characteristics of the entire flow passage under variable-speed conditions are studied. By integrating the SST k-ω turbulence model, the focus is on revealing the influence of the water pipeline on the flow pattern inside the runner and the vortex in the draft tube. Research indicates that the water pipeline substantially enhances the stability of the variable-speed process through the effects of inertial compensation and damping. The efficiency of the system utilizing piping is enhanced by 2.6% in comparison to a single unit, while the flow gradient has been decreased by 12%. Extend the propagation path of pressure waves to mitigate torque pulsation energy. It is essential to avoid the risks associated with structural resonance. By optimizing the speed distribution of the runner outlet surface, the disorderly development of the meridional velocity component is suppressed. This achieves the purpose of improving the vortex in the draft tube. This study systematically elucidates the effects of water pipelines on variable-speed processes, offering theoretical support for the operational optimization of variable-speed pump-turbines.
Publisher
IOP Publishing
Subject
