Endwall losses significantly contribute to the overall losses in modern turbomachinery, especially when aerodynamic airfoil load and pressure ratios are increased. In turbines with shrouded airfoils a large portion of these losses are generated by the leakage flow across the shroud clearance. Generally the related losses can be grouped into losses of the leakage flow itself and losses caused by the interaction with the main flow in subsequent airfoil rows. In order to reduce the impact of the leakage flow and shroud design related losses a thorough understanding of the leakage losses and especially of the losses connected to enhancing secondary flows and other main flow interactions has to be understood. Therefore, a three stage LP turbine typical for jet engines is being investigated. For the three-stage test turbine 3D Navier-Stokes computations are performed simulating the turbine including the entire shroud cavity geometry in comparison with computations in the ideal flow path. Numerical results compare favorably against measurements carried out at the high altitude test facility at Stuttgart University. The differences of the simulations with and without shroud cavities are analyzed for several points of operation and a very detailed quantitative loss breakdown is presented.
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October 2005
Technical Papers
Interaction of Shroud Leakage Flow and Main Flow in a Three-Stage LP Turbine
Jochen Gier,
Jochen Gier
MTU Aero Engines
, Dachauer Str. 665, Muenchen 80995, Germany
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Bertram Stubert,
Bertram Stubert
MTU Aero Engines
, Dachauer Str. 665, Muenchen 80995, Germany
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Bernard Brouillet,
Bernard Brouillet
MTU Aero Engines
, Dachauer Str. 665, Muenchen 80995, Germany
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Laurent de Vito
Laurent de Vito
MTU Aero Engines
, Dachauer Str. 665, Muenchen 80995, Germany
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Jochen Gier
MTU Aero Engines
, Dachauer Str. 665, Muenchen 80995, Germany
Bertram Stubert
MTU Aero Engines
, Dachauer Str. 665, Muenchen 80995, Germany
Bernard Brouillet
MTU Aero Engines
, Dachauer Str. 665, Muenchen 80995, Germany
Laurent de Vito
MTU Aero Engines
, Dachauer Str. 665, Muenchen 80995, GermanyJ. Turbomach. Oct 2005, 127(4): 649-658 (10 pages)
Published Online: March 1, 2003
Article history
Received:
December 1, 2002
Revised:
March 1, 2003
Citation
Gier, J., Stubert, B., Brouillet, B., and de Vito, L. (March 1, 2003). "Interaction of Shroud Leakage Flow and Main Flow in a Three-Stage LP Turbine." ASME. J. Turbomach. October 2005; 127(4): 649–658. https://doi.org/10.1115/1.2006667
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