Failure analysis of the 350MW steam turbine blade root
Source abstract
Abstract
Abstract This paper presents an analysis of the cause of fracture in a steam turbine blade root. During the maintenance of a steam turbine, several L-2 blade roots with crack were encountered. In this work a visual inspection was combined with a revision of the turbine operation history. A turbine flow analysis was realized together with verification of the blade root dimensions and tolerances. Also, a finite-element analysis (FEA) of the blade group was carried out to calculate the natural frequencies. In the analysis, dynamic and static steam forces were calculated for the determination of the blade root stresses with mismatch in different contact areas. Finally, a fractography analysis on the root crack surfaces was realized. The results show that improper mismatch between the contact areas of the blade root and rotor fastening tree was the main cause of blade root fracture.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High Temperature Alloys and Creep · Fatigue and fracture mechanics · Bladed Disk Vibration Dynamics
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References (5)
Show source-provided references
1. Kubiak J, Urquiza G, García JC. Historial de operación de la BP de la turbina de 350MW. Internal report of EM-CIICAp, No. 88P/DM/CIICAp, Universidad Autónoma del Estado de Morelos, Centro de Investigaciones en Ingeniería y Ciencias Aplicadas (UAEM-CIICAp); 2005.
2. Kubiak J, García JC. Medición de dimensiones geométricas del álabe L-2 y generación de modelo geométrico para análisis con el método del elemento finito. Internal report of UAEM-CIICAp, No. 85p/DM/CIICAP; 2005.
3. Kubiak J, García JC. Medición de frecuencias naturales y cálculo de frecuencias naturales con el método de elemento finito del álabe L-2 de la turbina de 350MW. Internal report of UAEM-CIICAp No. 111p/DM/CIICAp; 2005.
4. Kubiak J, Segura JA, Garcia JC. Cálculo de esfuerzos en la raíz del álabe L-2 de la turbina de 350MW con el método de elemento finito. Internal report of UAEM-CIICAp, No. 112p/DM/CIICAp; 2007.
5. Gonzalez GR, Kubiak J. Análisis metalografico de la falla del álabe de la turbina de 350MW. Internal report of UAEM-CIICAp, No. 87/DM/CIICAP; 2005.