Geiser, Georg and Wellner, Jens and Kügeler, Edmund and Weber, Anton and Moors, Anselm (2018) On the Simulation of unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine, Part II: Full-Wheel Simulation. In: Proceedings of the ASME Turbo Expo. ASME 2018 Turbo Expo, 2018-06-11 - 2018-06-15, Oslo, Norwegen. doi: 10.1115/GT2018-76764.
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Abstract
This is the second part of a series of three papers on the simulation of turbulence and transition effects in a multistage low pressure turbine. In this second part, the investigated two-stage low pressure turbine is described and results of a nonlinear full-wheel time-domain simulation are presented, analyzed and compared with the available experimental data. Furthermore, recent improvements to the CFD solver TRACE are described in brief that lead to significantly reduced wall-clock times for such large scale simulations. The utilized models match those used in the Harmonic Balance (HB) based simulations that are presented in the third paper of this series, such that the full-wheel result can be utilized to validate the HB result. Transition, flow separation and wall pressure fluctuations on the stator blades of the second stage are analyzed in detail. A strong azimuthal Pi-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 the HB based simulations.
Item URL in elib: | https://elib.dlr.de/126181/ | ||||||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||||||||||
Additional Information: | HGF - Research field: Aeronautics, Space and Transport HGF - Program: Aeronautics HGF - Program Themes: propulsion systems DLR - Program: L ER - Engine Research | ||||||||||||||||||||||||
Title: | On the Simulation of unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine, Part II: Full-Wheel Simulation | ||||||||||||||||||||||||
Authors: |
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Date: | 15 June 2018 | ||||||||||||||||||||||||
Journal or Publication Title: | Proceedings of the ASME Turbo Expo | ||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||||||
DOI: | 10.1115/GT2018-76764 | ||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||
Keywords: | CFD, Turbulence, Transition, Low Pressure Turbine | ||||||||||||||||||||||||
Event Title: | ASME 2018 Turbo Expo | ||||||||||||||||||||||||
Event Location: | Oslo, Norwegen | ||||||||||||||||||||||||
Event Type: | international Conference | ||||||||||||||||||||||||
Event Start Date: | 11 June 2018 | ||||||||||||||||||||||||
Event End Date: | 15 June 2018 | ||||||||||||||||||||||||
Organizer: | ASME IGTI | ||||||||||||||||||||||||
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 Institute of Propulsion Technology > Numerical Methodes | ||||||||||||||||||||||||
Deposited By: | Wellner, Jens | ||||||||||||||||||||||||
Deposited On: | 28 Jan 2019 07:20 | ||||||||||||||||||||||||
Last Modified: | 24 Apr 2024 20:30 |
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