To investigate the characteristics of solid-liquid two-phase flow in a screw axial-flow pump, the internal flow field inside the flow passages of the pump were numerically simulated by using Ansys CFX software with the RNG k-ε turbulence model. The diameter of sand is 2 mm, and sand initial volume fractions are 5%, 10% and 15%, respectively; whilst the initial volume fractions of oil are 5%, 10% and 15% as well. It was demonstrated that sand and oil are mainly accumulated around the leading edge of blade on the hub, and at the impeller tip. If the initial volume fractions of sand and oil are changed, then their distributions in the flow passages are changed simultaneously, and the areas with a higher concentration of them are varied too, indicating that both sand and oil phases can influence the distribution of each other in the flow passages. When the initial volume fractions of sand and oil are kept constant, the relative velocity pattern of every phase in the flow passages generally tends to be consistent with each other. The magnitude of the relative velocity of sand is the highest, but that of water is the lowest, and that of oil is in between. The estimated head and efficiency curves are essentially consistent with the experimental ones because the errors in head and efficiency between estimate and measurement are 3% and 4% only. This suggests that the performance test protocol is reasonable and feasible, and the numerical simulation results are relatively accurate.
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