Fatigue of piston rod caused by unsteady, unbalanced, unsynchronized blade torques in a Kaplan turbine

The stresses in Kaplan turbine piston rod were analyzed to predict failure conditions based on the 3D unsteady flow through the Kaplan turbine. The results show that the predicted stress concentration position in the rod agrees well with the actual fracture position. The mean stress and the dynamic...

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Bibliographic Details
Published inEngineering failure analysis Vol. 17; no. 1; pp. 192 - 199
Main Authors Luo, Yongyao, Wang, Zhengwei, Zeng, Jidi, Lin, Jiayang
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2010
Subjects
Dynamic stress
Fatigue fracture
Kaplan turbine
Piston rod
Unsynchronized
Dynamic stress
Unsynchronized
Kaplan turbine
Fatigue fracture
Piston rod
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Summary:The stresses in Kaplan turbine piston rod were analyzed to predict failure conditions based on the 3D unsteady flow through the Kaplan turbine. The results show that the predicted stress concentration position in the rod agrees well with the actual fracture position. The mean stress and the dynamic stress in the rod varied greatly with operating conditions. The dynamic stress reached 46.0 MPa at the high head low output condition, which caused the final rod failure. The mean of the dynamic stresses in the rod increase with increasing blade angle error, but the amplitudes decrease.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1350-6307
1873-1961
DOI:10.1016/j.engfailanal.2009.06.003