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Experimental and Numerical Investigation of Secondary Flow Structures in an Annular LPT Cascade under Periodic Wake Impact - Part 1: Experimental Results

[+] Author and Article Information
Martin Sinkwitz

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

Benjamin Winhart

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

David Engelmann

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

Francesca di Mare

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

Ronald Mailach

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

1Corresponding author.

ASME doi:10.1115/1.4042284 History: Received February 15, 2018; Revised September 19, 2018

Abstract

Experimental studies have been conducted on a modified T106 low pressure turbine (LPT) profile in an annular 1.5 stage axial turbine rig at the Chair of Thermal Turbomachines and Aeroengines, Ruhr-Universität Bochum. The rig setup allows the highly resolved measurement of unsteady wake-stator flow interaction in both space and time. Incoming wakes are generated by a variable-speed driven rotor equipped with cylindrical bars. In the present paper an experimental approach to the investigation of unsteady phenomena is proposed. Time-averaged as well as instantaneous measurement data from 2D flow field traverses at the stator exit are provided for the analysis of the periodically unsteady vortex formation, displacement and suppression. Additional time-accurate blade pressure data are used to study the relationship between the flow structures downstream of the stator row and the immediate intermittent wake impact on the blades. Bar wake kinematics are discussed and transferred to the observations.

Copyright (c) 2018 by ASME
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