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Investigation of Blade Tip Interaction with Casing Treatment in a Transonic Compressor - Part 1: Particle Image Velocimetry

Voges, Melanie and Schnell, Rainer and Willert, Christian and Mönig, Reinhard and Müller, Martin W. and Zscherp, Carsten (2008) Investigation of Blade Tip Interaction with Casing Treatment in a Transonic Compressor - Part 1: Particle Image Velocimetry. In: ASME-Paper, GT2008-50210. 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 (CT), consisting of 3.5 axial slots per rotor pitch in order to investigate the predicted extension of the stall margin characteristics both numerically and experimentally. Contrary to most other studies the CT was designed especially accounting for an optimized optical access in the immediate vicinity of the CT, rather than giving maximum benefit in terms of stall margin extension. Part 1 of this two-part contribution describes the experi¬mental investigation of the blade tip interaction with casing treatment using Particle image velocimetry (PIV). The nearly rectangular geometry of the CT cavities allowed a portion of it to be made of quartz glass with curvatures matching the casing. Thus the flow phenomena could be observed with essentially no disturbance caused by the optical access. Two periscope light sheet probes were specifically designed for this application to allow for precise alignment of the laser light sheet at three different radial positions in the rotor passage (87.5%, 95% and 99%). For the outermost radial position the light sheet probe was placed behind the rotor and aligned to pass the light sheet through the blade tip clearance. It was demonstrated that the PIV technique is capable of providing velocity information of high quality even in the tip clearance region of the rotor blades. The chosen type of smoke-based seeding with very small particles (about 0.5 µm in diameter) supported data evaluation with high spatial resolution, resulting in a final grid size of 0.5 x 0.5 mm. The PIV data base established in this project forms the basis for further detailed evaluations of the flow phenomena present in the transonic compressor stage with CT and allows validation of accompanying CFD calculations using the TRACE code. Based on the combined results of PIV measurements and CFD calculations of the same compressor and CT geometry a better understanding of the complex flow characteristics can be achieved, as detailed in Part 2 of this paper.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Investigation of Blade Tip Interaction with Casing Treatment in a Transonic Compressor - Part 1: Particle Image Velocimetry
Authors:
AuthorsInstitution or Email of Authors
Voges, MelanieUNSPECIFIED
Schnell, RainerUNSPECIFIED
Willert, ChristianUNSPECIFIED
Mönig, ReinhardUNSPECIFIED
Müller, Martin W.Technische Universität Darmstadt
Zscherp, CarstenMTU Aero Engines GmbH
Date:9 June 2008
Journal or Publication Title:ASME-Paper, GT2008-50210
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:PIV, casing treatment, compressor, transonic, phase-average
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:23 Jul 2008
Last Modified:12 Dec 2013 20:31

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