Failure investigation of a Kaplan turbine blade lever

被引：0
|
作者：
Cao, Jingwei [1 ]
Yang, Guangdong [2 ]
Luo, Yongyao [1 ]
Chen, Jie [2 ]
Liao, Run [2 ]
Wang, Zhengwei [1 ]
机构：
[1] State Key Laboratory of Hydroscience and Engineering&, Department of Energy and Power Engineering, Tsinghua University, Beijing,100084, China
[2] Yalong River Hydropower Development Co., Ltd., Sichuan,610051, China
来源：
Engineering Failure Analysis | 2022年 / 142卷
关键词：
Blade lever - Control mechanism - Dynamic stress - Failure investigation - Fluid-structure interaction - Interaction methods - Multi-body - Multibody dynamic - Operating condition - Turbine blade;
D O I：
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学科分类号：
摘要：
The control mechanism of the Kaplan turbine is quite complex, and many of the failure cases of the control mechanism have been reported. The present work analyzed a failure case of the blade lever based on the multibody mechanics and fluid-structure interaction method. The flow characteristics in 49 operating conditions are simulated, and the pressure on the runner surface is applied on the FEM model. A dynamic stress isoline is proposed to carry out an in-depth analysis of the failure reason of the blade lever in full operating conditions. The fracture of the blade lever could be attributed to long time operation in high dynamic stress region, which leads to the accelerated fatigue damage. Results in this paper could be helpful for the design, operation and maintenance of the Kaplan turbine. © 2022 Elsevier Ltd
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