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Int. J. Turbomach. Propuls. Power 2018, 3(2), 13; https://doi.org/10.3390/ijtpp3020013

Experimental Characterization of Unsteady Forces Triggered by Cavitation on a Centrifugal Pump

1
Chemical Propulsion, SITAEL S.p.A., 56121 Pisa, Italy
2
Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy
This paper is an extended version of our paper published in Proceedings of the 17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC 2017).
*
Author to whom correspondence should be addressed.
Received: 6 February 2018 / Revised: 27 April 2018 / Accepted: 2 May 2018 / Published: 7 May 2018
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Abstract

The paper presents an experimental campaign aimed at the characterization of the relationship between cavitation-induced instabilities and forces acting on the shaft, relevant to space application turbopumps. The experiments have been carried out on a six-bladed unshrouded centrifugal turbopump. Pressure fluctuations are analyzed in their frequency content for understanding the instability nature (axial, rotating) and their main characteristics (e.g., amplitude, rotating direction). The spectral analysis of the force components highlights a strong relationship of the z-component (along the rotating axis) with axial instabilities. On the other hand, rotating cavitation may involve force oscillations along all the three components leading to unwanted and dangerous fluctuating unbalances perpendicular to the rotating axis. View Full-Text
Keywords: cavitation; rotordynamic; centrifugal pump; turbomachinery cavitation; rotordynamic; centrifugal pump; turbomachinery
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Valentini, D.; Pace, G.; Pasini, A.; Hadavandi, R.; d’Agostino, L. Experimental Characterization of Unsteady Forces Triggered by Cavitation on a Centrifugal Pump. Int. J. Turbomach. Propuls. Power 2018, 3, 13.

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