Gas turbine oxidation life assessment and monitoring

Mazaheri, F ; Sharif University of Technology | 2018

590 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s11085-018-9863-4
  3. Publisher: Springer New York LLC , 2018
  4. Abstract:
  5. 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. © 2018, Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. Coating ; Gas turbine ; Life monitoring ; Spallation ; Coatings ; Degradation ; Gas turbines ; Gases ; Metal coatings ; Oxidation ; Turbomachine blades ; Damage accumulation ; Degradation mechanism ; Maintenance intervals ; Operating services ; Operational conditions ; Rate of oxidations ; Real time monitoring ; Turbine components
  8. Source: Oxidation of Metals ; Volume 90, Issue 5-6 , 2018 , Pages 691-711 ; 0030770X (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11085-018-9863-4