In order to study fluid pressure fluctuation features in the volute of a centrifugal pump under solid-liquid two-phase flow conditions, a series of unsteady, three-dimensional, turbulent, sand particle-laden water flows in a single-stage double-suction centrifugal pump are simulated based on the ASMM solid-liquid two-phase flow model and SIMPLEC algorithm as well as the RNG k-ε two-equation turbulence model. The pressure fluctuations are characterized at various solid volume fractions and sand particle diameters; additionally, the simulated results of two-phase flow with 12% solid phase volume fraction and 0.05 mm particle diameter are compared with those of water alone. The results show that the pressure fluctuation of solid-liquid two-phase flow is much greater than the water single phase flow, and the pulse waveform of the two-phase flow is with 0.002 s lag. The pressure fluctuation rises with the increasing solid phase volume fraction, but the change in fluctuation amplitude is not significant. Also, the fluctuation is reduced with the increasing particle diameter. Compared with particle diameter, the solid volume fraction affects the pressure fluctuation more remarked than the particle diameter does. The blade passing frequency is dominated in the pressure fluctuations in the volute, further the maximum pressure fluctuation occurs at the double blade passing frequency.
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