Using SST k-ω turbulent model, both steady and unsteady numerical methods were applied to simulate centrifugal pumps with various collectors of single volute, double volute, and vaned diffuser with a volute, in which the same impeller was adopted. The overall characteristics, steady and unsteady radial forces characteristics of the centrifugal pumps with three different collectors were compared and analyzed according to the simulated results. The results show that the curves of capacityhead of both single volute and double volute centrifugal pump are flat and the high efficiency areas are relatively wide. Radial force of the single volute centrifugal pump is much larger than that of the other two. As flow rate increases, radial force direction of the vaned centrifugal pump changes slightly, while those of the other two change greatly and move from the tongue to the volute exit. The overall trend of radial forces of single volute and double volute centrifugal pumps is elliptic distribution, and that of the vaned centrifugal pump is irregular. Radial force balance of the single volute centrifugal pump is poor and transient amplitude fluctuations are much larger than the other two models. The research results can be beneficial reference for cognition and design of centrifugal pumps.
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