Failure analysis of a hydraulic Kaplan turbine shaft

被引：25

作者：

Urquiza, G. ^{[1
]}

Garcia, J. C. ^{[1
]}

Gonzalez, J. G. ^{[1
]}

Castro, L. ^{[1
]}

Rodriguez, J. A. ^{[1
]}

Basurto-Pensado, M. A. ^{[1
]}

Mendoza, O. F. ^{[2
]}

机构：

[1] Univ Autonoma Estado Morelos, Ctr Invest Ingn & Ciencias Aplicada, Cuernavaca 62209, Morelos, Mexico

[2] Comis Fed Elect, Subdirecc Generac Hidroelect, Mexico City 01780, DF, Mexico

来源：

ENGINEERING FAILURE ANALYSIS | 2014年 / 41卷

关键词：

Turbine; Kaplan; Shaft; Failure analysis;

D O I：

10.1016/j.engfailanal.2014.02.009

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This paper shows the results of the failure analysis of a 105 MW Kaplan turbine auxiliary shaft from a hydropower plant. As a part of the failure analysis, the turbine operation history was revised and the metallographic study was done. A sample of the cracked turbine shaft was examined using optical microscopy and scanning electron microscopy. Failed auxiliary shaft was coupled to the main turbine shaft and its principal function was turning the runner blades according to flow direction. In order to complement the cause of failure, a finite element analysis (FEA) was done to calculate the stress level under the maximum and minimum turbine blade inclination position. The results of present investigation showed that failure was caused by high cycle and low stress fatigue. The presence of a stress concentrator on the turbine shaft was a crucial factor to the fatigue crack-initiation phase. The FEA revealed also that the frequently load variations, showed in the operation history, could have contributed to the crack propagation. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：108 / 117

页数：10

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