Measurements in the vaneless diffuser of a radial flow compressor |
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Authors: | P.M. Ligrani R. Van Den Braembussche M. Roustan |
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Affiliation: | 1. von Karman Institute for Fluid Dynamics, Rhode-St-Genese, Belgium;2. Société Creusot-Loire, Le Creusot, France |
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Abstract: | Results from an experimental study of flow behaviour at the inlet of a vaneless diffuser of a centrifugal compressor are presented. Measurements from a crossed hot-wire probe are given for operating points having inlet flow coefficients ranging from 0.006 to 0.019 at different Reynolds numbers. Instantaneous, time-averaged, and phase-averaged absolute velocity and flow angle at the diffuser inlet are deduced from the hot-wire signals after correction for mean density variations. These results show how flow behaviour varies in stable, rotating stall and surge regimes of compressor operation |
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Keywords: | compressors diffusers unsteady flow rotating stall |
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