This paper investigates the relationship between design parameters and creep life consumption of stationary gas turbines using a physics based life model. A representative thermodynamic performance model is used to simulate engine performance. The output from the performance model is used as an input to the physics based model. The model consists of blade sizing model which sizes the HPT blade using the constant nozzle method, mechanical stress model which performs the stress analysis, thermal model which performs thermal analysis by considering the radial distribution of gas temperature, and creep model which using the Larson-miller parameter to calculate the lowest blade creep life. The effect of different parameters including radial temperature distortion factor (RTDF), material properties, cooling effectiveness and turbine entry temperatures (TET) is investigated. The results show that different design parameter combined with a change in operating conditions can significantly affect the creep life of the HPT blade and the location along the span of the blade where the failure could occur. Using lower RTDF the lowest creep life is located at the lower section of the span, whereas at higher RTDF the lowest creep life is located at the upper side of the span. It also shows that at different cooling effectiveness and TET for both materials the lowest blade creep life is located between the mid and the tip of the span. The physics based model was found to be simple and useful tool to investigate the impact of the above parameters on creep life.
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ASME Turbo Expo 2010: Power for Land, Sea, and Air
June 14–18, 2010
Glasgow, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4398-7
PROCEEDINGS PAPER
Impact of Operating Conditions and Design Parameters on Gas Turbine Hot Section Creep Life
S. Eshati,
S. Eshati
Cranfield University, Cranfield, Bedford, UK
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M. F. Abdul Ghafir,
M. F. Abdul Ghafir
Cranfield University, Cranfield, Bedford, UK
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P. Laskaridis,
P. Laskaridis
Cranfield University, Cranfield, Bedford, UK
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Y. G. Li
Y. G. Li
Cranfield University, Cranfield, Bedford, UK
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S. Eshati
Cranfield University, Cranfield, Bedford, UK
M. F. Abdul Ghafir
Cranfield University, Cranfield, Bedford, UK
P. Laskaridis
Cranfield University, Cranfield, Bedford, UK
Y. G. Li
Cranfield University, Cranfield, Bedford, UK
Paper No:
GT2010-22334, pp. 547-558; 12 pages
Published Online:
December 22, 2010
Citation
Eshati, S, Abdul Ghafir, MF, Laskaridis, P, & Li, YG. "Impact of Operating Conditions and Design Parameters on Gas Turbine Hot Section Creep Life." Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine. Glasgow, UK. June 14–18, 2010. pp. 547-558. ASME. https://doi.org/10.1115/GT2010-22334
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