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Estimation of the Induced Incidence of a High Reaction Axial Turbine Bucket

Author

Listed:
  • Marek Klimko

    (Department of Power System Engineering, Faculty of Mechanical Engineering, University of West Bohemia, 301 00 Pilsen, Czech Republic)

  • Pavel Žitek

    (Department of Power System Engineering, Faculty of Mechanical Engineering, University of West Bohemia, 301 00 Pilsen, Czech Republic)

  • Daniel Duda

    (Department of Power System Engineering, Faculty of Mechanical Engineering, University of West Bohemia, 301 00 Pilsen, Czech Republic)

  • Bartolomej Rudas

    (Doosan Skoda Power, Department of R&D, 301 28 Pilsen, Czech Republic)

Abstract

This paper describes the effect of the incidence angle of the bucket on the performance of the axial turbine stage. The off-design operating conditions of the turbine stage result in a change in the velocity diagrams. This results in a positive or negative incidence. One of the basic objectives in turbine stage design is to estimate the flow behaviour of the turbine stage during off-design operation as accurately as possible and to quantify the corresponding decrease in efficiency. The available loss prediction models allow the estimation of the loss distribution when the incidence angle changes in the preliminary design phase. However, the incidence angle is actually affected by the velocity of circulation, which changes the input velocity vector (induced incidence). Thus, the blade row angle of attack is different from the angle based on the velocity diagram calculations. The result of our paper is a relation for estimating the angular difference of the input flow angle to the bucket defined as a function of the turbine operation mode.

Suggested Citation

  • Marek Klimko & Pavel Žitek & Daniel Duda & Bartolomej Rudas, 2022. "Estimation of the Induced Incidence of a High Reaction Axial Turbine Bucket," Energies, MDPI, vol. 15(17), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6440-:d:905806
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