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Gas Turbine Oxidation Life Assessment and Monitoring

Oxidation of Metals volume 90, pages 691–711 (2018)Cite this article

Abstract

Gas turbine hot-section parts can be very expensive components with a finite lifetime. Their durability is strongly dependent on the operating service conditions which control the maintenance intervals and associated expenses. Blade damage is the most frequent reason for failures in gas turbine engines and also oxidation is one of the most critical degradation mechanisms when the power system operates in partially loading condition. This paper describes the methodology of oxidation life assessment for uncoated and coated blades with various metallic coatings in the first stage of a typical gas turbine engine. The resultant weight-change curves were validated by comparing them with the experimental and numerical data from the various references. Also a computer code was developed for real-time monitoring of remaining oxidation life and damage on the maximum blade temperature where the maximum damage accumulation occurs. Results indicated that the oxidation life consumption increases if the duration of cycle decreases or the temperature of the metal is increased during real-time operational condition. Also, considering a duplex metallic coating on the first-stage blade, the rate of oxidation damage reduces about 10 times compared to an uncoated blade.

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Abbreviations

\(t\) :

Time (h)

\(\tau\) :

Cycle time (h)

\(T\) :

Temperature (°C)

\(Z\) :

The ratio of the molecular weight of the oxide to the atomic weight of oxygen in the oxide

\(k_{p}\) :

Oxidation kinetic constant \(\left( {\frac{{{\text{mg}}^{2} }}{{{\text{cm}}^{4} \,{\text{h}}}}} \right)\)

\(W_{\text{ox}}\) :

Weight of oxide formed during a thermal cycle \(\left( {\frac{\text{mg}}{{{\text{cm}}^{2} }}} \right)\)

\(W_{\text{s}}\) :

Weight of oxide spalled during thermal cycle \(\left( {\frac{\text{mg}}{{{\text{cm}}^{2} }}} \right)\)

\(W_{\text{r}}\) :

Weight of oxide remained on the coating surface after a thermal cycle \(\left( {\frac{\text{mg}}{{{\text{cm}}^{2} }}} \right)\)

\({\text{RL}}\) :

Remaining life

\(\rho\) :

Density \(\left( {\frac{\text{kg}}{{{\text{m}}^{3} }}} \right)\)

\(X_{\text{Al}}\) :

Aluminum content (at.%)

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Authors and Affiliations

  1. Fatigue and Fracture Laboratory, Department of Aerospace Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, 15875-4413, Iran

    F. Mazaheri

  2. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, 4563-11155, Iran

    M. Alizadeh

  3. Amirkabir University of Technology (Tehran Polytechnic), Tehran, 15875-4413, Iran

    H. Akheratdoost

  4. Sharif University of Technology, Tehran, 11365-11155, Iran

    H. Khaledi

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  1. F. Mazaheri
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  4. H. Khaledi
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Correspondence to M. Alizadeh.

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Mazaheri, F., Alizadeh, M., Akheratdoost, H. et al. Gas Turbine Oxidation Life Assessment and Monitoring. Oxid Met 90, 691–711 (2018). https://doi.org/10.1007/s11085-018-9863-4

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