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.
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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/ | ||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||
Title: | On the Simulation and Spectral Analysis of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine | ||||||||||||||||||
Authors: |
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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 (old) | ||||||||||||||||||
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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