Detailed flow measurements were taken in a centrifugal turbomachine model to investigate the aerodynamic influence of the vaned diffuser on the impeller flow. The model consists of an unshrouded centrifugal impeller with backswept blades and a rotatable vaned diffuser, which enables a continuous variation of the vaned diffuser location with respect to the measuring points. Phase-locked ensemble-averaged velocity components have been measured with hot-wire probes at the impeller outlet for 30 different relative positions of the probe with respect to the diffuser vanes. The data also include the distribution of the ensemble-averaged static pressure at the impeller front end, taken by means of miniature fast response pressure transducers flush-mounted at the impeller stationary casing. By circumferentially averaging the results obtained for the different circumferential probe locations, the periodically perturbed impeller flow has been split into a relative steady flow and a stator-generated unsteadiness. The results for the different probe positions have also been correlated in time to obtain instantaneous flow field images in the relative frame, which provide information on the various aspects of the diffuser vane upstream influence on the relative flow leaving the impeller.
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January 1996
Research Papers
An Experimental Investigation of Stator Induced Unsteadiness on Centrifugal Impeller Outflow
M. Ubaldi,
M. Ubaldi
Istituto di Macchine e Sistemi Energetici, Universita` di Genova, Genova, Italy
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P. Zunino,
P. Zunino
Istituto di Macchine e Sistemi Energetici, Universita` di Genova, Genova, Italy
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G. Barigozzi,
G. Barigozzi
Istituto di Macchine e Sistemi Energetici, Universita` di Genova, Genova, Italy
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A. Cattanei
A. Cattanei
Istituto di Macchine e Sistemi Energetici, Universita` di Genova, Genova, Italy
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M. Ubaldi
Istituto di Macchine e Sistemi Energetici, Universita` di Genova, Genova, Italy
P. Zunino
Istituto di Macchine e Sistemi Energetici, Universita` di Genova, Genova, Italy
G. Barigozzi
Istituto di Macchine e Sistemi Energetici, Universita` di Genova, Genova, Italy
A. Cattanei
Istituto di Macchine e Sistemi Energetici, Universita` di Genova, Genova, Italy
J. Turbomach. Jan 1996, 118(1): 41-51 (11 pages)
Published Online: January 1, 1996
Article history
Received:
January 31, 1994
Online:
January 29, 2008
Citation
Ubaldi, M., Zunino, P., Barigozzi, G., and Cattanei, A. (January 1, 1996). "An Experimental Investigation of Stator Induced Unsteadiness on Centrifugal Impeller Outflow." ASME. J. Turbomach. January 1996; 118(1): 41–51. https://doi.org/10.1115/1.2836604
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