Abstract：To reduce the pressure fluctuation amplitude in a double-suction centrifugal pump, the blades of both sides of the impeller are separated circumferentially with 0?, 10?, 20?, 30? staggered angles respectively in double-suction pump ES350-585 with a usual double-suction impeller. A structured grid in the flow domains of five pumps with usual and staggered impellers is generated by using Gridpro; subsequently aunsteady, 3D fluid dynamics analysis is launched in ANSYS CFX to obtain pump performance and unsteady static pressure profiles. It is seen that the staggered blades can reduce pressure fluctuation in the pumps effectively. Moreover the pressure fluctuation amplitude decreases with the increasing staggered angle. Importantly, when the staggered is 30?, the pressure fluctuation amplitude in the volute reaches the minimum and the static pressure becomes the most uniform at the entrance to the volute.
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