Volume 3, Issue 6, December 2018, Page: 145-152
Effects of Ambient Temperature and Shaft Power Variations and Compressor Degradation on Creep-Fatigue Interaction Life Consumption of Industrial Gas Turbine Blades
Ebigenibo Genuine Saturday, Department of Mechanical Engineering, University of Port Harcourt, Port Harcourt, Nigeria
Thank-God Isaiah, Department of Mechanical Engineering, Niger Delta University, Wilberforce Island, Nigeria
Received: Dec. 9, 2018;       Accepted: Dec. 25, 2018;       Published: Jan. 16, 2019
DOI: 10.11648/j.eas.20180306.12      View  43      Downloads  19
Abstract
This work centres on the investigation of the effects of ambient temperature, shaft power level and compressor degradation (in the form of reduction of health parameter indices including flow capacity index, isentropic efficiency index, and the pressure ratio index) on the creep-fatigue interaction life consumption of the high pressure turbine blades of LM2500+ engine. The aim is to ascertain how the different effects affect engine creep-fatigue interaction life consumption so that engine operators will be properly guided. The Larson-Miller parameter method was used for creep life tracking while the modified universal slopes method was used for the fatigue life analysis. Creep and fatigue damage parameters were obtained at each engine operation point and the linear damage accumulation model was used for the creep-fatigue interaction life analysis. The life analysis models were implemented in PYTHIA, Cranfield university’s in-house gas turbine performance and diagnostics software where an engine model was developed and creep-fatigue interaction life was investigated at different ambient temperatures and shaft power levels. In the compressor degradation, 1% and 2% reduction in the health parameter indices were implanted in the developed engine model and the effects of the degradations were investigated at different shaft power levels and ambient temperatures. It was observed that at a given shaft power level, creep-fatigue life expressed in terms of creep-fatigue factor decreases with increase in ambient temperature while at a given ambient temperature, creep-fatigue life decreases with increase in shaft power. For the degraded engine, the percentage decrease in creep-fatigue factors increases with both shaft power increase and ambient temperature increase. Doubling the compressor health parameter indices reduction nearly doubles the impact on creep-fatigue life consumption. For instance, at 70% power level, the 1% and 2% degradation cases gave percentage reductions in creep-fatigue interaction life as 10.84% and 21.16% respectively while the respective results at 90% power level are 16.05% and 30.10%. The methodologies developed could be applied to other engine types and the results will serve as useful guides to engine operators.
Keywords
Creep-Fatigue Interaction, Health Parameter Indices, Flow Capacity Index, Isentropic Efficiency Index, Pressure Ratio Index
To cite this article
Ebigenibo Genuine Saturday, Thank-God Isaiah, Effects of Ambient Temperature and Shaft Power Variations and Compressor Degradation on Creep-Fatigue Interaction Life Consumption of Industrial Gas Turbine Blades, Engineering and Applied Sciences. Vol. 3, No. 6, 2018, pp. 145-152. doi: 10.11648/j.eas.20180306.12
Copyright
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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