Application of particle image velocimetry to a transonic centrifugal compressor

As part of an ongoing research project the performance and internal flow field of a high-pressure ratio centrifugal compressor is being investigated. Based on previous, primarily, point-wise laser-optical measurements the compressor was redesigned and resulted in an improved impeller and diffuser wi...

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Bibliographic Details
Published in:Experiments in fluids 2007-08, Vol.43 (2-3), p.371-384
Main Authors: VOGES, Melanie, BEVERSDORFF, Manfred, WILLERT, Chris, KRAIN, Hartmut
Format: Article
Language:English
Subjects:
Applied sciences
Centrifugal compressors
Compressors
Diffusers
Energy
Energy. Thermal use of fuels
Engines and turbines
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Impellers
Instrumentation for fluid dynamics
Particle image velocimetry
Physics
Research projects
Turbomachinery
Vanes
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Description
Summary:As part of an ongoing research project the performance and internal flow field of a high-pressure ratio centrifugal compressor is being investigated. Based on previous, primarily, point-wise laser-optical measurements the compressor was redesigned and resulted in an improved impeller and diffuser with a single-stage pressure ratio of 6:1 at 50,000 rpm. Current research activities involve the use of particle image velocimetry (PIV) to analyze and further improve the understanding of the complex flow phenomena inside the vaned diffuser given the capability of PIV of capturing spatial structures. The study includes phase-resolved measurements of the flow inside a diffuser vane passage with respect to the impeller blade position. Both, instantaneous and phase-averaged velocity fields are presented. The flow field results obtained by PIV are to be used for future validation of the related CFD calculations, which in turn are expected to lead to further improvements in compressor performance. In addition, the potential of stereo PIV for this type of turbomachinery application could be successfully demonstrated.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-007-0279-1