Application of finite element method in the analysis of blade fracture

Huadian Technology ›› 2008, Vol. 30 ›› Issue (2): 34-38.

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Application of finite element method in the analysis of blade fracture

LEI Ling-bo, LIU Ming-jie, WANG Bao-lin

In view of the 330MW subcritical condenser steam unit with single intermediate reheat, four cylinders and quadruple flow, the large-area cracking problem on the 4th-stage blade of LP rotor was analyzed. Main factors contributing to the vibration response and dynamic stress of blades were discussed. With the vibration model, the vibration features and dynamic stress were calculated. The result showed that the blade fracture was mainly caused by the defective design in blade vibration characteristics.

Received:1900-01-01 Revised:1900-01-01 Online:2008-02-25 Published:2008-02-25

Abstract

Abstract:

In view of the 330MW subcritical condenser steam unit with single intermediate reheat, four cylinders and quadruple flow, the large-area cracking problem on the 4th-stage blade of LP rotor was analyzed. Main factors contributing to the vibration response and dynamic stress of blades were discussed. With the vibration model, the vibration features and dynamic stress were calculated. The result showed that the blade fracture was mainly caused by the defective design in blade vibration characteristics.

Key words: LP rotor, blades, fracture, vibration characteristics, mechanical properties, dynamic stress

LEI Ling-bo;LIU Ming-jie;WANG Bao-lin. Application of finite element method in the analysis of blade fracture [J]. Huadian Technology, 2008, 30(2): 34-38.

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Application of finite element method in the analysis of blade fracture

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