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Research Papers: Gas Turbines: Turbomachinery

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
e-mail: ebigenibo.saturday@uniport.edu.ng

Thank-God Isaiah

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

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 3, 2017; final manuscript received April 21, 2018; published online June 25, 2018. Assoc. Editor: Herman Shen.

J. Eng. Gas Turbines Power 140(10), 102601 (Jun 25, 2018) (7 pages) Paper No: GTP-17-1004; doi: 10.1115/1.4040106 History: Received January 03, 2017; Revised April 21, 2018

The effect of engine degradation in the form of compressor fouling and compressor turbine degradation on the creep life consumption of the high-pressure (HP) turbine blades of an LM2500+ industrial gas turbine engine is investigated in this work. The degradations are flow capacity degradation and isentropic efficiency degradation. An engine model was created in Cranfield gas turbine performance and diagnostics software, pythia. Blade thermal and stress models were developed together with the Larson–Miller parameter (LMP) method for creep life analysis. The percentage decreases in creep life due to each effect were examined. For the engine considered, compressor degradation has more impact on engine creep life toward peak power operation, while HP turbine degradation has more impact on creep life at lower power levels. 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.

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Figures

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Fig. 1

Engine model configuration

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Fig. 2

Blade sections and radial temperature distribution

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Fig. 3

Algorithm for estimating degradation effect on creep life consumption

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Fig. 4

Comparison of the effects of compressor efficiency and flow capacity indices reduction on creep factors

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Fig. 5

Creep factors for clean engine and degraded engine due to compressor degradation at different power levels

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Fig. 6

Decrease in creep factors due to compressor degradation at different power levels

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Fig. 7

Average percentage decrease in creep factors with compressor degradation at different power levels

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Fig. 8

Creep factors for clean and degraded engines (HP turbine) at different power levels

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Fig. 9

Average percentage decrease in creep factor with HP turbine degradation at different power levels

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Fig. 10

Comparison of decreases in creep factor values with different components degradations at different ambient temperatures and power levels

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Fig. 11

Decrease in creep life with compressor degradation at two different power levels

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Fig. 12

Decrease in creep life with HP turbine degradation at two different power levels

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Fig. 13

Decrease in creep life with both components degradation at two different power levels

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