Publications Repository - Gdańsk University of Technology

In this paper has been presented a methodology of validation a novel mathematical model dedicated to evaluation and prediction of material degradation and demage of steam turbine elements such as blades, valves and pipes due to three mechanisms: stress-corosion, high-temperature creep and low-cyclic fatigue. The validation concept is based on an experimental setup manufactured in the Laboratory of Faculty of Mechanical and Power Engineering, Wrocław UT. The concept of validation by comparison of measured and numerically predicted eigen-frequencies and eigen-modes of different turbine elements within labolatory conditions are presented, and mathematical models of three damage mechanisms have been described. Using the mentioned method of experimental validation based on comparisons of eigen-frequencies, we could calibrate yet unkwown coefficients in the turbine damage model. A practical aim is an implementation of a novel life-time module for the BOTT (block of thermal stresses restriction) system. In practicular the stress-corrosion factor will be dded numerical control system. In particular the stress-corrosion factor will be added for the advanced numerical control system, creating in such way a universal, flexible and a complete tool for monitoring degrees od degradation, corrosion and damage of critical points in a steam turbine.

Authors

• Krzysztof Jesionek,
• Jarosław Kron,
• Witold Zakrzewski,
• Daniel Sławiński link open in new tab ,
• Sebastian Kornet link open in new tab ,
• Paweł Ziółkowski,
• Janusz Badur