The Influence of Different Operating Conditions on the Support Bracket Stress in Pumped Storage Units

Buchao Xu, Weiqiang Zhao, Wenhua Lin, Zhongyu Mao, Ran Tao and Zhengwei Wang
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Buchao Xu: Fujian Xianyou Pumped Storage Co., Ltd., Putian 351267, China
Weiqiang Zhao: State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Wenhua Lin: Fujian Xianyou Pumped Storage Co., Ltd., Putian 351267, China
Zhongyu Mao: State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Ran Tao: State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Zhengwei Wang: State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China

Energies, 2022, vol. 15, issue 6, 1-15

Abstract: In order to balance the intermittent supply of energy to the power grid, pumped storage units have to operate more and more in extended operating conditions and switch their mode frequently. During operation, the turbine unit has to withstand various axial forces that may cause deformation and fatigue damage to the key components of the machine. The excessive load could surpass the weight of the runner body, which is dangerous for the power plant. For the safe and stable operation, the simulation of the axial force under pump condition is performed by the computational fluid dynamics method (CFD) in this paper. The CFD simulation result has revealed the variation rule of the axial force with the operating condition. Besides, the conditions with pressure-balance pipelines (PBP) blockage are also investigated and the mechanism of PBP on reducing the axial force applied on the bracket has been revealed. The maximum stresses are calculated by means of Finite Element Method (FEM) and compared with the normal conditions. The result shows that the blocked PBP will increase 62.20% of the maximum stress on the support bracket.

Keywords: pump-turbine; runner axial force; pressure balance pipeline; CFD (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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