Flow and Vibration in the Small Steam Turbine Last Stage

Autor: Hoznedl Michal, Dadáková Tereza, Bém Jindřich
Jazyk: English<br />French
Rok vydání: 2022
Předmět:
Zdroj: MATEC Web of Conferences, Vol 369, p 02001 (2022)
Druh dokumentu: article
ISSN: 2261-236X
DOI: 10.1051/matecconf/202236902001
Popis: The paper deals with evaluation of experimental data obtained from the real-size 30 MW output Waste to Energy steam turbine. For many turbine regimes pressures in the last stage area were obtained. At the same time amplitudes of blade tips vibrations were measured of last rotor blades using the blade tip timing system and axial velocity of the steam at the last stage outlet. The obtained data are mutually correlated and relations are analysed between increased vibration values and pressure ratios at the last stage. Increased tip vibrations occur mainly in the area when the pressure ratio over the last blade tip and root is higher than one. In this case there is no expansion, but compression in the last stage of the turbine. The presented results contribute to understanding of processes in the last stage of the steam turbine, mainly for those regimes of turbine operation when its output is lower than 20 % of the nominal output, e.g. during the island regime.
Databáze: Directory of Open Access Journals