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research-article

EFFECTS OF COMPRESSOR FOULING AND COMPRESSOR TURBINE DEGRADATION ON ENGINE CREEP LIFE CONSUMPTION

[+] Author and Article Information
Ebigenibo Genuine Saturday

Department of Mechanical Engineering, University of Port Harcourt Port Harcourt, Rivers State, Nigeria
satebi@yahoo.com

Thank-God Isaiah

Department of Mechanical Engineering, Niger Delta University, Wilberforce Highland Amassoma, Bayelsa State, Nigeria
Thankgod607@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4040106 History: Received January 03, 2017; Revised April 21, 2018

Abstract

The effect of engine degradation in the form compressor fouling and compressor turbine degradation on the creep life consumption of the first stage blades of the high pressure (HP) turbine of a LM2500+ industrial gas turbine engine is investigated in this work. An engine model was created in Cranfield gas turbine performance and diagnostics software, PYTHIA and adapted to the real engine operation conditions. Using the Larson-Miller Parameter method for creep life analysis, a thermal model and a stress model were developed to provide temperatures and stresses at various locations along the span of the blades. The sensitivity of engine life consumption to each effect is examined by evaluating the percentage decrease in creep life due to the given effect. The degradation of each engine component is provided in the form of engine health parameter indices define by the flow capacity and the isentropic efficiency of the component. For the engine considered, it is found that compressor flow capacity degradation has more impact on creep life than compressor isentropic efficiency degradation. Compressor degradation has more impact on creep life than compressor turbine degradation. In terms of percentage decrease in engine creep life, compressor degradation has more impact on engine creep life towards peak power operation while HP turbine degradation has more impact on creep life at lower power of engine operation. The results of this work will give engine operators an idea of how engine components creep life is consumed and make reasonable decisions concerning operating at part loads.

Copyright (c) 2018 by ASME
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