Open AccessAnalysis of Dynamic Stresses of Pump-Turbine Runner during Load Rejection Process in Turbine Mode
Author(s) -
Funan Chen,
Xiaolong Yang,
Huili Bi,
Zhongyu Mao,
Yongyao Luo,
Liujingshi,
Honggang Fan,
Zhengwei Wang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/774/1/012100
Subject(s) - turbine , rotational speed , computational fluid dynamics , specific speed , stress (linguistics) , rotation (mathematics) , flow (mathematics) , structural engineering , finite element method , load rejection , mechanics , head (geology) , process (computing) , mechanical engineering , engineering , impeller , computer science , geology , centrifugal pump , physics , operating system , linguistics , philosophy , geomorphology , artificial intelligence
During load rejection process, the rotation rate, head and discharge change a lot and the internal flow of the runner is complex, leading to fatigue cyclic loads on the runner. In some cases, fatigue cracks appear at the stress concentration location of the runner. This paper studied the dynamic stresses of a pump-turbine runner during load rejection process in turbine mode using finite element method. The hydraulic loads were obtained from CFD analysis, and the clearance flow was taken into consideration in the CFD simulation. The variation of performance characteristics was calculated through the one-dimensional method of characteristic (1D-MOC). The results show that the pressure on outer surfaces of runner changed the stress of the runner, and the rotation rate had a great influence on the dynamic stresses of the runner.