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X-Ray Measurements in a Cavitating Centrifugal Pump During Fast Start-ups

Duplaa, Sébastien and Coutier-Delgosha, Olivier and Dazin, Antoine and Bois, Gérard X-Ray Measurements in a Cavitating Centrifugal Pump During Fast Start-ups. (2013) Journal of Fluids Engineering, 135 (4). ISSN 0098-2202

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Official URL: http://dx.doi.org/10.1115/1.4023677

Abstract

The start-up of rocket engine turbopumps is generally performed in a few seconds or even less. It implies that these pumps reach their nominal operating conditions after a few rotations only. During the start-up, the flow evolution within the pump is governed by transient phenomena, based mainly on the flow rate and rotation speed increase. Significant pressure fluctuations, which may result in the development of cavitation, are observed. A centrifugal impeller whose transient behaviour during start-ups has been detailed in a previous publication is considered. Three different cases of fast start-ups have been identified according the final operating point (Duplaa et al. 2010 [1]). The aim of this paper is to analyse the evolution during the start-ups of the local amount of vapor in the blade to blade channels of the pump by fast X-ray imaging. This technique has enabled to calculate the time-evolution of the fluid density within the pump, which appears to be correlated with pressure time-evolutions. For each investigated start-up, X-ray measurements have been performed at three different sections of the impeller height. For each investigated start-up and section tested, measurements have been performed for several initial positions of the impeller, to estimate the measurement uncertainty, and to obtain records from different beam angles, like in tomography.

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)
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:
Funders:
CNES - SNECMA
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Deposited By: Sebastien Duplaa
Deposited On:22 Jul 2013 12:35

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