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Investigation of Blade Tip Interaction with Casing Treatment in a Transonic Compressor - Part 2: Numerical Results

Schnell, Rainer and Voges, Melanie and Mönig, Reinhard and Müller, Martin W. and Zscherp, Carsten (2008) Investigation of Blade Tip Interaction with Casing Treatment in a Transonic Compressor - Part 2: Numerical Results. In: ASME-Paper, GT2008-50212. ASME Turbo Expo 2008, 2008-06-09 - 2008-06-13, Berlin, Germany.

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Abstract

A single-stage transonic axial compressor was equipped with a casing treatment, consisting of 3.5 axial slots per rotor pitch in order to investigate its influence on stall margin characteristics as well as on the rotor near tip flowfield both numerically and experimentally. Contrary to most other studies a generic Casing Treatment was designed to provide optimal optical access in the immediate vicinity of the CT, rather than for maximum benefit in terms of stall margin extension. The second part of this two-part paper deals with the numerical developments, and their validation, carried out in order to efficiently perform time-accurate casing-treatment simulations. The numerical developments focus on the extension of an existing coupling algorithm in order to carry out unsteady calculations with any exterior geometry coupled to the main flow passage (in this case a single slot) having an arbitrary pitch. This extension is done by incorporating frequency domain, phase-lagged boundary conditions into this coupling procedure. Whereas the phaselag approach itself is well established and validated for standard rotor-stator calculations, its application to casing treatment simulations is new. Its capabilities and validation will be demonstrated on the given compressor configuration, making extensive use of the detailed PIV flowfield measurements near the rotor tip. Instantaneous data at all measurement planes will be compared for different rotor positions with respect to the stationary slots in order to evaluate the time-dependent interaction between the rotor and the casing treatment.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Investigation of Blade Tip Interaction with Casing Treatment in a Transonic Compressor - Part 2: Numerical Results
Authors:
AuthorsInstitution or Email of Authors
Schnell, RainerUNSPECIFIED
Voges, MelanieUNSPECIFIED
Mönig, ReinhardUNSPECIFIED
Müller, Martin W.Technische Universität Darmstadt
Zscherp, CarstenMTU Aero Engines GmbH
Date:9 June 2008
Journal or Publication Title:ASME-Paper, GT2008-50212
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:TRACE, CFD, phase-lag, casing treatment, compressor, transonic, validation
Event Title:ASME Turbo Expo 2008
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:2008-06-09 - 2008-06-13
Organizer: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 > Engine Measurement Systems
Institute of Propulsion Technology > Fan and Compressor
Deposited By: Melanie Voges
Deposited On:28 Jul 2008
Last Modified:12 Dec 2013 20:31

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