Abstract
This paper presents experimental results on the wake characteristics of a mixed-flow impeller and their relation to the impeller loss. The circumferential variations of the velocity at the impeller exit were measured at various radial locations using a five-hole pressure probe with quick response. The wake profiles were examined and then the wake momentum thickness was related to total pressure losses occurring in the fluid flow across the impeller. In addition, the effect of both the centrifugal force and deceleration rate across the impeller was studied on the total pressure loss. From these results, loss and stall correlations were obtained.
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