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Assessment of degradation equivalent operating time for aircraft gas turbine engines

Published online by Cambridge University Press:  09 January 2020

O. Alozie Open the ORCID record for O. Alozie [Opens in a new window] ,
Y.G. Li ,
M. Diakostefanis ,
X. Wu ,
X. Shong  and
W. Ren
O. Alozie*
Affiliation:
School of Aerospace, Transport and Manufacturing Cranfield UniversityMK43 0AL, Bedford UK
Y.G. Li
Affiliation:
School of Aerospace, Transport and Manufacturing Cranfield UniversityMK43 0AL, Bedford UK
M. Diakostefanis
Affiliation:
School of Aerospace, Transport and Manufacturing Cranfield UniversityMK43 0AL, Bedford UK
X. Wu
Affiliation:
Shenyang Engine Design and Research Institute (SEDRI) Aircraft Engine Corporation of China (AECC) Beijing China
X. Shong
Affiliation:
Shenyang Engine Design and Research Institute (SEDRI) Aircraft Engine Corporation of China (AECC) Beijing China
W. Ren
Affiliation:
Shenyang Engine Design and Research Institute (SEDRI) Aircraft Engine Corporation of China (AECC) Beijing China
*
[email protected]
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Abstract

This paper presents a novel method for quantifying the effect of ambient, environmental and operating conditions on the progression of degradation in aircraft gas turbines based on the measured engine and environmental parameters. The proposed equivalent operating time (EOT) model considers the degradation modes of fouling, erosion, and blade-tip wear due to creep strain, and expresses the actual degradation rate over the engine clock time relative to a pre-defined reference condition. In this work, the effects of changing environmental and engine operating conditions on the EOT for the core engine booster compressor and the high-pressure turbine were assessed by performance simulation with an engine model. The application to a single and multiple flight scenarios showed that, compared to the actual engine clock time, the EOT provides a clear description of component degradation, prediction of remaining useful life, and sufficient margin for maintenance action to be planned and performed before functional failure.

Keywords

Gas turbinePerformanceDegradationFoulingErosionCreepEquivalent Operating TimePrognosticsRemaining useful life
Type
Research Article
Information
The Aeronautical Journal , Volume 124 , Issue 1274 , April 2020 , pp. 549 - 580
Copyright
© Royal Aeronautical Society 2020

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Footnotes

A version of this paper was presented at the 24th ISABE Conference in Canberra, Australia, September 2019.

References

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