Conference Proceedings

Les and RANS analysis of the end-wall flow in a linear LPT cascade, part I: Flow and secondary vorticity fields under varying Inlet condition

R Pichler, Yaomin Zhao, RD Sandberg, V Michelassi, R Pacciani, M Marconcini, A Arnone

PROCEEDINGS OF THE ASME TURBO EXPO: TURBOMACHINERY TECHNICAL CONFERENCE AND EXPOSITION, 2018, VOL 2B | AMER SOC MECHANICAL ENGINEERS | Published : 2018

Abstract

In low-pressure-turbines (LPT) around 60–70% of losses are generated away from end-walls, while the remaining 30–40% is controlled by the interaction of the blade profile with the end-wall boundary layer. Experimental and numerical studies have shown how the strength and penetration of the secondary flow depends on the characteristics of the incoming end-wall boundary layer. Experimental techniques did shed light on the mechanism that controls the growth of the secondary vortices, and scale-resolving CFD allowed to dive deep into the details of the vorticity generation. Along these lines, this paper discusses the end-wall flow characteristics of the T106 LPT profile at Re = 120K and M = 0.59..

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Grants

Awarded by Australian Research Council


Funding Acknowledgements

The authors gratefully acknowledge Baker Hughes, a GE Company for granting the permission to publish this paper. Compute time for the LES has been provided by the Pawsey Supercomputing center in Perth, Australia, and the Swiss national supercomputing center CSCS in Lugano, Switzerland. The work conducted at the University of Melbourne was conducted under a GE research grant.