Erosion of Steam Turbine Last Stages
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F21%3A00544211" target="_blank" >RIV/61388998:_____/21:00544211 - isvavai.cz</a>
Výsledek na webu
<a href="https://aip.scitation.org/doi/abs/10.1063/5.0042949" target="_blank" >https://aip.scitation.org/doi/abs/10.1063/5.0042949</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0042949" target="_blank" >10.1063/5.0042949</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Erosion of Steam Turbine Last Stages
Popis výsledku v původním jazyce
This paper is concerned with the steam turbine last stage erosion, which has caused by water droplets of wet steam working. The process of a steam condensation flowing through the last turbine stages is complicated thermodynamic process bringing unwanted corrosion and erosion of low pressure turbine parts. Except that wet steam expansion generate wet loss - drop of efficiency of stages working with a wet steam. Wet loss has maximum value in nucleation stages. where steam expanses below Wilson Zone in enthalpy-entropy diagram. Water droplets of spontaneous condensation have a small diameter around 1 or 2 gm. They have low mass, preserve of steam velocity vector and they did not give rise to erosion of leading edge. Water droplets covering surfaces of turbine flow parts and creating thin water layers. Water flows down to the trailing edge of nozzles and it splits into more massive droplets with diameter spectrum from 5 to 180 gm. These droplets did not preserve of steam velocity vector and their impact energy erodes to bucket leading edges locally at the tip. A difference of a steam and water droplet trajectory is proportionate to droplet mass. It is possible to reduce erosion damage by the turbine last stage design. Stage design could include an active erosion protect solution by suction water layer throw hollow nozzle to a condenser or application more resistant metal to bucket leading edge as a passive solution. The best way, how to reach a long time operation of last buckets, is to use both protections - active and passive erosion protections in parallel.
Název v anglickém jazyce
Erosion of Steam Turbine Last Stages
Popis výsledku anglicky
This paper is concerned with the steam turbine last stage erosion, which has caused by water droplets of wet steam working. The process of a steam condensation flowing through the last turbine stages is complicated thermodynamic process bringing unwanted corrosion and erosion of low pressure turbine parts. Except that wet steam expansion generate wet loss - drop of efficiency of stages working with a wet steam. Wet loss has maximum value in nucleation stages. where steam expanses below Wilson Zone in enthalpy-entropy diagram. Water droplets of spontaneous condensation have a small diameter around 1 or 2 gm. They have low mass, preserve of steam velocity vector and they did not give rise to erosion of leading edge. Water droplets covering surfaces of turbine flow parts and creating thin water layers. Water flows down to the trailing edge of nozzles and it splits into more massive droplets with diameter spectrum from 5 to 180 gm. These droplets did not preserve of steam velocity vector and their impact energy erodes to bucket leading edges locally at the tip. A difference of a steam and water droplet trajectory is proportionate to droplet mass. It is possible to reduce erosion damage by the turbine last stage design. Stage design could include an active erosion protect solution by suction water layer throw hollow nozzle to a condenser or application more resistant metal to bucket leading edge as a passive solution. The best way, how to reach a long time operation of last buckets, is to use both protections - active and passive erosion protections in parallel.
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
—
OECD FORD obor
20301 - Mechanical engineering
Návaznosti výsledku
Projekt
<a href="/cs/project/TH02020057" target="_blank" >TH02020057: Profilové turbínové mříže pro supersonická proudová pole</a><br>
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2021
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
AIP Conference Proceedings
ISBN
978-0-7354-4067-8
ISSN
0094-243X
e-ISSN
1551-7616
Počet stran výsledku
11
Strana od-do
060008
Název nakladatele
American Institute of Physics Inc.
Místo vydání
Melville
Místo konání akce
Plzeň
Datum konání akce
8. 9. 2020
Typ akce podle státní příslušnosti
WRD - Celosvětová akce
Kód UT WoS článku
000668075000028