The numerical simulations of the threedimensional flow inside a mixedflow pump were done by using unstructured tetrahedral mesh and the SIMPLEC algorithm, which was employed in Fluent. The timeaveraged continuity equation and the N-S equation as well as the RNG k-ε turbulence model in a relative coordinate system were used as the flow model in the pump. The static pressures and absolute velocity distribution on impeller blades and guide vanes were examined after the mesh sizeindependent was checked. The flow resistance coefficient across the pump was estimated with steady and unsteady head curves when the number of guide vanes and inlet angle of the guide vanes were subject to be changed.It was found that the lowest flow resistance coefficient was reached at three guide vanes, and the highest head and best efficiency were achieved at nine guide vanes while the rest geometrical parameter of the guide vanes remained unchanged. At a zero angle of attack the lowest flow resistance coefficient, highest head and best efficiency were obtained at the design condition when just the inlet angle of the guide vanes were altered. However, the coefficient, head and efficiency didn′t seem changed significantly. The results showed that the number of guide vanes should be as small as possible to meet the requirement on efficiency for a particular application. In addition the mixedflow pump performance has no significant change when the inlet angle of guide vanes is changed by less than 5° for a diffuser casing.
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