Abstract
The submerged vortex should be eliminated to decrease the vibration. It is necessary to increase the pump flow rate while preventing the occurrence of vortices with submerged vortex breaker. The pump discharge quantity should be increased without changing the shape of the sump construction, because the sump design is frequently beyond the control of the pump designer. In this study, the pump performance test is conducted with several types of suction bells. The influence of suction bell shape on the behavior of vortex and pressure fluctuation and vibration is studied, and it is found that the submerged vortex can be controlled with the multi suction bells. A pump flow rate with an ordinary bell can be increased with the application of multi suction bells. It is confirmed that the submerged vortex can be controlled to decrease the pressure fluctuation and the vibration.
