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

被引：33

作者：

Luo Yongyao ^{[1
]}

Wang Zhengwei ^{[1
]}

Zeng Jidi ^{[2
]}

Lin Jiayang ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Thermal Engn, Beijing 100084, Peoples R China

[2] Fujian Shuikou Hydropower Stn, Fuzhou 350800, Peoples R China

来源：

ENGINEERING FAILURE ANALYSIS | 2010年 / 17卷 / 01期

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

Kaplan turbine; Piston rod; Fatigue fracture; Unsynchronized; Dynamic stress;

D O I：

10.1016/j.engfailanal.2009.06.003

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

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. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：192 / 199

页数：8