Shock wave configuration in a transonic flow through a mid-section of a last stage turbine blade cascade equipped with a part-span connector

Tomáš Radnic; Pavel Šafařík; Martin Luxa; David Šimurda

doi:10.14311/AP.2023.63.0268

Authors

Tomáš Radnic Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Fluid Dynamics and Thermodynamics, Technická 1902/4, 162 00 Prague, Czech Republic
Pavel Šafařík Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Fluid Dynamics and Thermodynamics, Technická 1902/4, 162 00 Prague, Czech Republic; Czech Academy of Sciences, Institute of Thermomechanics, Dolejškova 1402/5, 182 00 Prague, Czech Republic
Martin Luxa Czech Academy of Sciences, Institute of Thermomechanics, Dolejškova 1402/5, 182 00 Prague, Czech Republic
David Šimurda Czech Academy of Sciences, Institute of Thermomechanics, Dolejškova 1402/5, 182 00 Prague, Czech Republic

DOI:

https://doi.org/10.14311/AP.2023.63.0268

Keywords:

transonic flow, blade cascade, part-span connector, numerical simulation, shock wave, steam turbine

Abstract

This paper deals with the study of a flow field and namely the configuration of shock waves in a blade cascade equipped with a part-span connector called tie-boss. The cascade consists of prismatic blades formed from the mid-section of a very long last-stage blade of a steam turbine. The study is based on numerical simulations of the flow through a cascade that was previously tested in a wind tunnel. Commercial software Ansys CFX was used for the simulations and Ansys ICEM for the mesh generation. The computational domain contains non-homogenous mesh interfaces. The simulations showed that the presence of the tie-boss has a profound effect on the configuration of the shock waves. The blade exit shock waves are disturbed and new lateral shock waves are introduced into the flow.

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References

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