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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