The flows in different structures of the rotor cavity in XP300-3 roto-jet pump are simulated by using the CFD software Fluent. The Reynolds-averaged Navier-Stokes equations, the standard k-ε turbulence model and SIMPLE algorithm are adopted in the simulations. According to the existing studies on rotor cavity structures, the cavity structure is optimized by using three configurations, namely adding a rib on the cavity outer surface, reducing the cavity axial width, integrating them together. The flows in the rotor-jet pumps with these configurations are simulated and their performances are extracted and compared with that for the original cavity structure. It is turned out that under the same working condition both added rib and reduced axial width are helpful to effectively reduce the residence time of fluid in the cavity and to shrink the cavity cross-section area as well as to relieve wear of pump casing. The configuration either with the rib or reduced width can improve pump head and efficiency significantly, especially for the head. For the configuration with both rib and reduced width, the pump is subject to remarked improvement in head and efficiency at the same operational condition. These results show that the rotor cavity structure can be optimized with a superposition approach.
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