MATEC Web of Conferences (Jan 2022)

Steam turbine flow path drainage system under different operating conditions

  • Hoznedl Michal,
  • Bém Jindřich

DOI
https://doi.org/10.1051/matecconf/202236700010
Journal volume & issue
Vol. 367
p. 00010

Abstract

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One of the important elements of anti-erosion protection of the steam turbine last blades is the use of hollow stator blades. There are grooves on the blade surface that lead the steam mixture inside the blades. This mixture is blown to the diffuser area. However, the drain principle fails for low outputs of the turbine, during the so-called ventilation regimes. In the part of blade section the steam flow is reversed and the flow part drain stops working. It was confirmed using experiments of steam turbine carried out in a wide range of power outputs.