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Investigations inside a vaned diffuser of a centrifugal pump at low flowrates.

Article dans une revue avec comité de lecture
Author
DUPONT, Patrick
BOIS, Gérard
ccDAZIN, Antoine
531216 Laboratoire de Mécanique des Fluides de Lille - Kampé de Fériet [LMFL]
ccBAYEUL-LAINÉ, Annie-Claude

URI
http://hdl.handle.net/10985/15015
DOI
10.1088/1755-1315/49/3/032017
Date
2016
Journal
IOP Conference Series: Earth and Environmental Science

Abstract

This paper focuses on the unsteady flow behaviour inside the vaned diffuser of a radial flow pump model, operating at partial flowrates (0.387Qi, 0.584Qi and 0.766Qi where Qi is the impeller design flowrate).The effects of the leakage flows are taken into account in the analysis. PIV measurements have been performed at different hub to shroud planes inside one diffuser channel passage for a given speed of rotation, for several flowrates and different angular impeller positions. The performances and the static pressure rise of the diffuser were also measured using a three-holes probe in the same experimental conditions. The unsteady numerical simulations were carried out with Star CCM+ 10.02 code with and without leakage flow. The PIV measurements showed a high unsteadiness at very low flowrate which was confirmed by the numerical calculations. In previous studies it has been shown that the global performances, as the efficiencies are in good agreement between calculations and measurements. In this paper, a joint analysis of measurements and numerical calculations is proposed to improve the understanding of the flow behaviour in a vaned diffuser.

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