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research-article

On the Simulation and Spectral Analysis of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine

[+] Author and Article Information
Georg Geiser

Instiute of Propulsion Technology, German Aerospace Center (DLR), Linder Höhe, 51147, Cologne, Germany
Georg.Geiser@dlr.de

Jens Wellner

Instiute of Propulsion Technology, German Aerospace Center (DLR), Linder Höhe, 51147, Cologne, Germany
jens.wellner@dlr.de

Edmund Kuegeler

Instiute of Propulsion Technology, German Aerospace Center (DLR), Linder Höhe, 51147, Cologne, Germany
Edmund.Kuegeler@dlr.de

Anton Weber

Instiute of Propulsion Technology, German Aerospace Center (DLR), Linder Höhe, 51147, Cologne, Germany
anton.weber@dlr.de

Anselm Moors

MTU Aero Engines AG, Dachauer Straße 665, 80995 Munich, Germany
anselm.moors@googlemail.com

1Corresponding author.

ASME doi:10.1115/1.4041820 History: Received October 05, 2018; Revised October 19, 2018

Abstract

A nonlinear full-wheel time-domain simulation of a twostage low pressure turbine is presented, analyzed and compared with the available experimental data. Recent improvements to the CFD solver TRACE that lead to significantly reduced wallclock times for such large scale simulations are described in brief. Since the configuration is characterized by significant unsteady turbulence and transition effects, it is well suited for the validation and benchmarking of frequency-domain methods. Transition, flow separation and wall pressure fluctuations on the stator blades of the second stage are analyzed in detail. A strong azimuthal p-periodicity is observed, manifesting in a significantly varying stability of the midspan trailing edge flow with a quasi-steady closed separation bubble on certain blades and highly dynamic partially open separation bubbles with recurring transition and turbulent reattachment on other blades. The energy spectrum of fluctuating wall quantities in that regime shows a high bandwidth and considerable disharmonic content, which is challenging for frequency-domain based simulation methods.

Copyright (c) 2018 by ASME
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