Effect Of The Changes Of Related Parameters On The Vibration In Double-Suction Centrifugal Pump

Double-suction centrifugal pumps are wildly used in various fields due to its large flow rate,high lift, great balance, convenient maintenance and good corrosion resistance. However the vibration induced by internal pump flow brings bad influents,such as reducing reliability of the system operating, deteriorating working environment, bringing down equipment life. It could even destroy the system devices under severe conditions. Therefore, studies of internal flow characteristics and the velocity fluctuation in the pump is of great significance for reducing the vibration in the initial stage of design. The working medium of double suction pump changes will induce the change of related parameters, performance and vibration of the pump, and the modification of the gap between tongue and impeller have a significant effect on the internal flow field and vibration. So this paper take a double-suction centrifugal pump as the research subject. The three-dimensional unsteady numerial method was applied to simulate the flow in the double-suction centrifugal pump by using the FLUENT software. The effect of the working medium changes, tongue angle and the base circle diameter on internal flow field characteristic and velocity fluctuation will be analyzed carefully. The analysis results gave the best tongue angle and the best base circle diameter in different working medium which make the lowest vibration. And indicated that the measure of increasing the base circle to reduce the pump vibration is better than the measure of increasing the tongue angel. The result of the research can provide reference for the special requirement of customization and manufacturing of the double suction centrifugal pump which caused by the change of the working medium. So the other related problems except the performance vibration induced by the change of the working medium will be reduced in practical use.