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An experimental study was made on the interference between the flow around the rotating blades of an impeller and the flow issuing from the circular nozzle in mixed and inward-flow radial turbines.The pressure distribution along stationary blades of the circular nozzle and the rotating blades of the impeller was measured for various radial clearances between the circular nozzle and the impeller. The flow pattern in the radial clearance was also measured by means of a small Pitot tube.When the radial clearance was very small, the effect of the interference was found mainly in the pressure distribution along the rotating blade, i. e. in the lift-force of the impeller and, there existed a several-percent reduction in the effective efficiency of the turbine due to the interference.
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MAKI et al. (1973) studied this question.
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