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

Geiser, Georg and Wellner, Jens and Kügeler, Edmund and Weber, Anton and Moors, Anselm (2019) On the Simulation and Spectral Analysis of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine. ASME Journal of Turbomachinery, 141 (5). American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4041820 ISSN 0889-504X

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1115/1.4041820

Abstract

A nonlinear full-wheel time-domain simulation of a two-stage low pressure turbine is presented, analyzed, and compared with the available experimental data. Recent improvements to the computational fluid dynamics (CFD) solver TRACE that lead to significantly reduced wall-clock 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.

Item URL in elib:https://elib.dlr.de/126247/
Document Type:Article
Title:On the Simulation and Spectral Analysis of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Geiser, GeorgGeorg.Geiser (at) dlr.dehttps://orcid.org/0000-0003-0989-9676
Wellner, JensJens.Wellner (at) dlr.dehttps://orcid.org/0000-0003-0606-9415
Kügeler, EdmundEdmund.Kuegeler (at) dlr.dehttps://orcid.org/0000-0002-9719-626X
Weber, AntonAnton.Weber (at) dlr.deUNSPECIFIED
Moors, AnselmMTU Aero EnginesUNSPECIFIED
Date:May 2019
Journal or Publication Title:ASME Journal of Turbomachinery
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:141
DOI :10.1115/1.4041820
Publisher:American Society of Mechanical Engineers (ASME)
ISSN:0889-504X
Status:Published
Keywords:Spectroscopy, Turbulence, Simulation, Turbochargers, Emission spectroscopy, Pressure, Turbines, Blades, Separation (Technology), Bubbles
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Geiser, Dr. Georg
Deposited On:28 Jan 2019 07:22
Last Modified:28 Jan 2019 07:22

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