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Experimental study of a cavitating centrifugal pump during fast starts-up

Duplaa, Sébastien and Coutier-Delgosha, Olivier and Dazin, Antoine and Roussette, Olivier and Bois, Gérard and Caignaert, Guy Experimental study of a cavitating centrifugal pump during fast starts-up. (2010) Journal of Fluids Engineering, 132 (2). ISSN 0098-2202

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Official URL: http://dx.doi.org/10.1115/1.4000845

Abstract

The start-up of rocket engine turbopumps is generally performed only in a few seconds. It implies that these pumps reach their nominal operating conditions after only a few rotations. During these first rotations of the blades, the flow evolution in the pump is governed by transient phenomena, based mainly on the flow rate and rotation speed evolution. These phenomena progressively become negligible when the steady behavior is reached. The pump transient behavior induces significant pressure fluctuations which may result in partial flow vaporization, i.e. cavitation. An existing experimental test rig has been updated in the LML laboratory (Lille, France) for the start-ups of a centrifugal pump. The study focuses on cavitation induced during the pump start-up. Instantaneous measurement of torque, flow rate, inlet and outlet unsteady pressures, and pump rotation velocity enable to characterize the pump behavior during rapid starting periods. Three different types of fast start-up behaviors have been identified. According to the final operating point, the start-up is characterized either by a single drop of the delivery static pressure, by several low-frequency drops, or by a water hammer phenomenon that can be observed both a the inlet and outlet of the pump. A physical analysis is proposed to explain these three different types of transient flow behavior.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Arts et Métiers ParisTech (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Navale (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Université des Sciences et Technologies de Lille - USTL (FRANCE)
Other partners > Ecole Centrale de Lille (FRANCE)
Laboratory name:
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Deposited By: Sebastien Duplaa
Deposited On:26 Aug 2013 10:00

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