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Experimental and Numerical Investigation of Secondary Flow Structures in an Annular LPT Cascade under Periodical Wake Impact - Part 2: Numerical Results

[+] Author and Article Information
Benjamin Winhart

Chair of Thermal Turbomachines and Aeroengines, Department of Energy Engineering, Ruhr-Universität Bochum, Bochum 44801, Germany
benjamin.winhart@rub.de

Martin Sinkwitz

Chair of Thermal Turbomachines and Aeroengines, Department of Energy Engineering, Ruhr-Universität Bochum, Bochum 44801, Germany
martin.sinkwitz@rub.de

Andreas Schramm

Chair of Thermal Turbomachines and Aeroengines, Department of Energy Engineering, Ruhr-Universität Bochum, Bochum 44801, Germany
andreas.schramm@rub.de

David Engelmann

Chair of Thermal Turbomachines and Aeroengines, Department of Energy Engineering, Ruhr-Universität Bochum, Bochum 44801, Germany
David.Engelmann@rub.de

Francesca di Mare

Chair of Thermal Turbomachines and Aeroengines, Department of Energy Engineering, Ruhr-Universität Bochum, Bochum 44801, Germany
francesca.dimare@rub.de

Ronald Mailach

Chair of Turbomachinery and Flight Propulsion, Institute of Fluid Mechanics, Technische Universität Dresden, Dresden 01062, Germany
ronald.mailach@tu-dresden.de

1Corresponding author.

ASME doi:10.1115/1.4042283 History: Received February 15, 2018; Revised November 05, 2018

Abstract

In this work we present the results of the numerical investigations of periodic wake-sekondary flow interaction carried out on a low pressure turbine (LPT) equipped with modified T106-profile blades. The numerical predictions obtained by means of unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations using a k-omega-model have been compared with measurements conducted in the same configuration and discussed in part 1 of this 2-part work. The Q-criterion has been employed to characterize the secondary flow structures and accurately identify their origin. Based on these information a correlation between the time-dependent interactions of the incoming wakes and the vortex structures is proposed and discussed.

Copyright (c) 2018 by ASME
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