Numerical simulation of a new shrouded impeller vortex pump was carried out. The method of solving steady three-dimensional incompressible continuity equation and RANS equations were employed to calculate the hydraulic performance of the vortex pump. The axial bearing mechanism of the oil film toward the impeller was analyzed, and further discussion about the influence of the wedge shaped groove on both sides of the impeller on the bearing capacity of the oil film was made. It was found that the predicted hydraulic property was consistent with test data, which proves the calculating model reliable. In addition, the results show that the axial supporting of floating impeller is rely on the oil film formed on both side of the impeller. The different thickness of oil film results in different radial pressure drops. The thinner one results in the slow pressure drop while the thicker one results in the uniform pressure, which causes an unequal force on impeller and provides the holding power. More-over, the wedge shaped structure enhances the supporting effect. The study is useful for the design and analysis of vortex pumps.
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