The ow in the volute of a low speciÿc-speed pump was studied both experimentally and numerically near its design point. Measurements included time-averaged values of velocity and static pressure at a large number of locations in the volute. The numerical computations were based on the unsteady three-dimensional potential ow model for the core ow. Viscous losses were quantiÿed using additional models that use the potential ow as input. It is shown that near the design point of this pump, the core ow behaves like a potential ow, provided that no boundary layer separation occurs. Explanations are given for the presence of local deviations due to secondary ow. These local deviations do not in uence the overall potential ow characteristics signiÿcantly.
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