Czasopismo
2011
|
Vol. 11, nr 4(30)
|
5-10
Tytuł artykułu
Autorzy
Wybrane pełne teksty z tego czasopisma
Warianty tytułu
Języki publikacji
Abstrakty
After some time of exploitation steam turbine rotors blades in energetic industry they are being eroded and also their frequency of normal modes is changed. Those changes can cause to unwanted shift of blades normal mode frequencies. It is necessary to find quick method of rating changes of frequency in connection of mass loss due erosion. The evaluation of this dependence was made by finite element modeling method using HyperWorks 8.0 software. Geometrical model of blade L-0 with mass of 22 kg and length of 74 cm was used. There were calculated frequencies of the first five modes in function of mass loss along the leading blade edge (up to mass loss of 1,2%). Small losses of weight (around 0,2%) cause similar changes in values (around 0,2%) for all modes but with different types of frequency change (decrease or increase). The frequency decreases for all modes except mode the 3rd. For bigger mass loss an monotonic decrease of frequency was observed in 1st, 2nd, 5th mode and maximum (around +1,5 %) for 3rd mode and minimum (- 0,5%) for 4th mode. For maximum mass loss (1,2%) maximal decrease of frequency was observed in 2nd mode around -2%. Results of this modeling can be used to estimate changes of frequencies caused by erosion in exploited blades when their mass loss is known.
Słowa kluczowe
Czasopismo
Rocznik
Strony
5-10
Opis fizyczny
Bibliogr. 6 poz., rys., tab.
Twórcy
autor
autor
- Gdansk University of Technology, Faculty of Applied Physics and Mathematics, Narutowicza 11/12, 80-233 Gdansk, Poland, lgolunski@gmail.com
Bibliografia
- 1. Łączkowski R.: Drgania elementów turbin cieplnych, Wydawnictwo Naukowo – Techniczne, Warsaw 1974.
- 2. Azevedo C.R.F., Sinatora A.: Erosion – fatigue of steam turbine blades, Engineering Failure Analysis, 16 (2009), 2290-2303.
- 3. Unossona M., Lovssona L., Simonsson K. : Failure modelling in finite element analyses: Element erosion with crack-tip enhancement, Finite Elements in Analysis and Design, 42 (2006), 283–297
- 4. Kubiak J., Urquiza G., Garcia J., Sierra F.: Failure analysis of steam turbine last stage blade tenon and shroud, Engineering Failure Analysis, 14 (2007), 1476-1487.
- 5. Mazur Z., Hernandez-Rossette A., Garcia-Illescas R.: Investigation of the failure of the L-0 blades, Engineering Failure Analysis, 13 (2006), 1338-1350.
- 6. Mazur Z., Garcia Illescas R., Porcayo-Calderon J.: Last stage blades failure analysis of 28 MW geothermal turbine, Engineering Failure Analysis, 16 (2009), 1020 – 1032.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BPG8-0058-0001