Abstract
A novel double suction shaft-less mini pump was developed for heat control of small energy systems in this study. The mini pump impeller with an exit diameter of 40 mm was combined with the motor rotor supported by the hybrid dynamic bearing. The specific speed of the pump was 125 min−1 m3 min−1 m. The hydraulic performance of the pump was investigated experiment- tally under four rotational speeds. From the test results, it was recognized that the pump could provide a flow discharge of 5 L/min and head of 1.5 m, which are applicable for the heat control system of a 3 kW fuel cell. A three-dimensional turbulent flow simulation in the pump was also conducted near the design point. The numerical results showed that the average hydraulic performance of the mini pump was predicted reasonably. From the internal flow simulation, it was revealed that the favorable inflow condition upstream of impeller inlet could be attained by applying the double suction shaft-less design for the mini pump.
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