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On the Simulation of unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine, Part II: Full-Wheel Simulation

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, 11.-15.Juni 2018, Oslo, Norwegen.

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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/
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:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Geiser, GeorgGeorg.Geiser (at) dlr.dehttps://orcid.org/0000-0003-0989-9676
Wellner, JensJens.Wellner (at) dlr.deUNSPECIFIED
Kügeler, EdmundEdmund.Kuegeler (at) dlr.dehttps://orcid.org/0000-0002-9719-626X
Weber, AntonAnton.Weber (at) dlr.deUNSPECIFIED
Moors, AnselmMTUUNSPECIFIED
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
Status:Published
Keywords:CFD, Turbulence, Transition, Low Pressure Turbine
Event Title:ASME 2018 Turbo Expo
Event Location:Oslo, Norwegen
Event Type:international Conference
Event Dates:11.-15.Juni 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
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:28 Jan 2019 07:20

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