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

Marek Klimko (), Pavel Žitek, Daniel Duda and Bartolomej Rudas
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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

Energies, 2022, vol. 15, issue 17, 1-13

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.

Keywords: induced incidence; velocity circulation; axial turbine stage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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