Abstract
Flow measurements were taken in unshrouded and shrouded centrifugal impellers with 10 radial blades at the outlet by using a five-hole pressure probe. Measurements were taken for a flow rate corresponding to nearly zero incidence angle, and two other flows with reduced and increased flow rates. It was shown by these measurements that, along the passage, the low-energy region tended to move from the middle blade-to-blade position toward the suction side near the casing surface in the unshrouded impeller, and from the suction-side/shroud corner toward the hub side in the shrouded impeller. These shifts of low-energy region were observed upstream in the passages of both impellers, as the flow rate decreased.
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