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Experimental Investigation of the Rotor / Casing Treatment Interaction in an Axial Single-Stage Transonic Compressor

Müller, Martin W. and Schiffer, H.-P. and Voges, Melanie and Zscherp, Carsten (2009) Experimental Investigation of the Rotor / Casing Treatment Interaction in an Axial Single-Stage Transonic Compressor. 8th European Turbomachinery Conference, 23.-27. Mär. 2009, Graz, Österreich.

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Abstract

In the design process of compressors for gas turbines, the application of casing treatments showed a substantial contribution to the enhancement of total pressure ratio and stability. The development of a treated casing endwall remains quite demanding due to the complicated flow features and interactions, particularly when applied to transonic rotors with strong shock systems. To achieve an insight into these flow mechanisms, the axial single-stage Darmstadt Transonic Compressor Test Rig was equipped with a casing treatment with 56 bend axial slots. Speedlines and exit plane measurements were made for design speed and for a completely subsonic flow field. Time resolved measurement techniques were chosen to investigate the rotorcasing treatment interaction. The casing treatment was designed to provide an optical access through two slots. In addition, the land between these slots was replaced with a glass insert. The assembly allowed phase-resolved particle image velocimetry investigations in the rotor tip area and inside the tip gap underneath one axial slot. Results showed an increase in stall margin for both operating conditions. Efficiency declined slightly. At design speed, a second shock structure develops when the casing treatment is applied. This additional shock front has considerable effect on the flow field. Vortices inside the slots account for the efficiency losses.

Document Type:Conference or Workshop Item (Paper)
Title:Experimental Investigation of the Rotor / Casing Treatment Interaction in an Axial Single-Stage Transonic Compressor
Authors:
AuthorsInstitution or Email of Authors
Müller, Martin W.TU Darmstadt
Schiffer, H.-P.TU Darmstadt
Voges, Melaniemelanie.voges@dlr.de
Zscherp, CarstenMTU Aero Engines GmbH
Date:March 2009
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:casing treatment, transonic, piv, axial compressor
Event Title:8th European Turbomachinery Conference
Event Location:Graz, Österreich
Event Type:international Conference
Event Dates:23.-27. Mär. 2009
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 > Engine Measurement Systems
Deposited By: Melanie Voges
Deposited On:09 Nov 2009 15:43
Last Modified:27 Aug 2012 08:55

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