In the present article the numerical simulation of the flow inside the centrifugal pump of the type 100-250 of Pumpiran Company, including the impeller and the volute of the pump, has been done with Ansys CFX software. In cavitation simulation, flow is considered as a two-phase. The Rayleigh–Plesset equation has been used to study the growth and collapse of the vapor bubble. In order to validate the numerical results, the characteristic curves of the pump were extracted from the present study and compared with similar experimental results, which show a good agreement. The rate of deviation of the results at the pump flow rate (120 m3/h) is 6.5%. It is found that cavitation occurs at inlet pressures of less than 45 kPa. The position of cavitation occurs at 0.14 to 0.24 of the passage as well as at the beginning of the blades. The vapor volume fraction in these parts has increased from 0.04 to 0.96, respectively. In addition, by reducing the inlet pressure from 40 kPa to 20 kPa, the rate of flow separation also increases and its position is transferred from the beginning of the blade to the inner areas of the blade. The 3% drop in the head is also observed in the net positive suction head (NPSH) equal to 1.52 with the occurrence of cavitation in the diagrams.
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