Abstract
Experimental studies were performed with the objective of developing a jet pump to be used in new nuclear reactors in which the flow ratio (driven to driving flow rates) is relatively high compared to that of conventional jet pumps. Three series of experiments under atmospheric pressure and room temperature conditions were carried out for jet pumps having five nozzles, seven nozzles, and seven nozzles with swirling. The swirling flow was produced in the throat by inclining the six nozzle tips toward the circumferential direction of the pitch circle. It was shown that the maximum efficiencies of these three jet pumps were between 27 and 30 percent. Test results for jet pump having seven nozzles with swirling show slightly higher efficiencies than that without swirling. Measurements were made on pressure distributions and two-phase flow characteristics under the cavitation condition. Comparisons are also discussed between the measured and calculated efficiencies, considering the mixing effect in the bellmouth of the jet pump throat inlet.
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