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Aerodynamics of a Centrifugal Compressor Impeller with Transonic Inlet Conditions

Krain, H. and Hoffmann, B. (1998) Aerodynamics of a Centrifugal Compressor Impeller with Transonic Inlet Conditions. ASME Summer Meeting, Washington DC, June 1998.

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Abstract

Performance and laser measurement results are presented for a transonic centrifugal compressor stage, equipped with a backswept rotor designed for 586m/s tip speed and a mean relative inlet tip Mach number of 1.30. The flow field features of the rotor are analysed in detail with the help of laser measurements and the results obtained from a 3D viscous calculation. Both laser measurements and calculations are carried out for the impeller's design point and a comparison between measured and calculated data is presented for four measurement planes representing the inlet, exit and channel flow conditions. The maximum relative Mach number is found to be 1.45 and jet/wake type flow exists in the rear part of the flow channel with the wake concentrating in the shroud region. For the operating point investigated, the wake development is due more to the strong shround curvature in the meridional plane than to a shock induced boundary layer separation. Laser measurments and calculations point to a significant flow displacement in the impeller exit region caused by the wake flow. The theoretical results indicate that a flow separation occurs also at the front side of the vaneless diffuser.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Aerodynamics of a Centrifugal Compressor Impeller with Transonic Inlet Conditions
Authors:
AuthorsInstitution or Email of Authors
Krain, H.UNSPECIFIED
Hoffmann, B.UNSPECIFIED
Date:1998
Status:Published
Event Title:ASME Summer Meeting, Washington DC, June 1998
Organizer:ASME
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L TT - Triebwerkstechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:06 Jan 2010 13:01

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