Abstract
A comprehensive model for predicting the service life of steam turbine blades is presented. First of all, calculation models, with which exciting forces acting on steam turbine blades, the latter's dynamic frequencies and dynamic stresses can be calculated, were developed; followed by a proposed model, based on dynamic stress analysis results, for estimating the service life of steam turbine blades, which takes into consideration the manufacturing technology used and the erosive environment of operation, as well as other factors. Finally, a steam turbine's 680 mm long last stage blade is being analyzed with given experimentally based fatigue curve of the material and other necessary data. Results show that the exciting force, the dynamic frequency and dynamic stress analyzing models, all exhibit satisfactory engineering accuracy. This newly developed service life analyzing model is capable of qualitatively considering all factors that have an influence on the blades' service life, there with providing a strong basis for warranting the blade's reliability already in the design stage as well as during operation.
| Original language | English |
|---|---|
| Pages (from-to) | 11-15 |
| Number of pages | 5 |
| Journal | Dongli Gongcheng/Power Engineering |
| Volume | 27 |
| Issue number | 1 |
| State | Published - Feb 2007 |
Keywords
- Blade
- Dynamic stress
- Life
- Numerical model
- Power and mechanical engineering
- Reliability
- Steam turbine