The numerical simulation of interior flow field in self-priming pump under different working conditions was conducted on the platform of Fluent. Three- dimensional non-structural tetrahedral mesh and the SIMPLEC method were applied according to the time-averaged Navier-Stokes equation and standard k-ε turbulent model. The velocity and pressure distributions of the interior flow field of volute and impeller were obtained and analyzed, which revealed the flow principle inside the pump in the process of self-priming. Both the head and efficiency of the pump predicted were compared with that of tested. The results show that the pressure on blade pressure side is larger than that on the suction one at the same radius, both high pressure gradient and high velocity gradient appear at the reflux hole, and vortices with different sizes are formed due to the influence of separation chamber sidewall. The characteristic performance curves by numerical simulation basically agree with that by test.
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