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Experimental and numerical study of an axial flow pump

Monday, 22 May, 2006 - 17:30
Campus: Brussels Humanities, Sciences & Engineering campus
Faculty: Science and Bio-engineering Sciences
Stephan Geerts
phd defence

A test facility for a single stage rotor/stator propulsion pump, with a specific speed of
353 and a blade chord Reynolds number of 6.4.104, has been developed in the
laboratory of Fluids Mechanics at Vrije Universiteit Brussel. The objective of this
experiment was to improve our physical understanding of the complex 3D flow in this
hydro pump. The test bench is accommodated with a variety of instrumentation for
the measurement of the performance. Two-component laser Doppler velocimetry
measurements in nine different cross sections from 40% axially chord upstream the
tip rotor leading edge until 40% axially chord downstream the tip rotor trailing edge
over a dense span distribution were done at the design flow rate. The measurements
gave information about the (secondary) flow in the impeller, the tip and the wakes
downstream of the rotor blades. This detailed experimental database has been used for
validation of some numerical RANS simulations with the algebraic turbulence model
of Baldwin-Lomax, and the one-equation turbulence model of Spalart-Alllmaras. The
complex three-dimensional flow structure in the impeller of the axial flow pump was
reconstructed, with the help of flow visualisations of the numerical limited
streamlines and the topological concepts.

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