Abstract
Flow measurements were made in an unshrouded centrifugal impeller running at 1000 rpm. The impeller has 10 blades which are two-dimensional and radial at the outlet. for a flow rate in the shockless inlet to the blade, the relative velocities and the reduced static pressures were measured on nice cross-sectional planes within the rotating impeller passage, using a five-hole pressure probe fixed on the impeller-hub-wall. The rotary stagnation pressures were calculated from the measured values of the relative velocities and the reduced static pressures. In the mid-passage of the impeller, the wake due to the effects of the turbulent mixing, the Coriolis force, the curvature of the passage, the tip clearance flow and the friction on the casing wall, is shown about mid-position between the suction and pressure surface near the casing. The wake region increases on the suction surface at the outlet of the impeller, because of the turbulent mixing due to the uniformity of the pressure.
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