Abstract
Pressure fluctuation in the single-phase pump has been widely discussed, while less attention was paid for that in the multiphase pump. Therefore, this study investigated the pressure fluctuation in a multiphase rotodynamic pump. Unsteady simulations based on Euler two-fluid model were done with ANSYS-CFX software when the inlet gas void fractions (IGVFs) were 0.0%, 3.0%, 9.0%, and 15.0%. Under pure water (IGVF=0.0%) and gas-liquid two-phase (IGVFs=3.0%, 9.0%, 15.0%) conditions, the reliability of numerical method was verified by comparison with the experimental data. The numerical results showed that the dominant frequency in the impeller and guide vane corresponded to the blade numbers of guide vane and impeller, respectively. This illustrated that the rotor-stator interaction was the main cause for the generation of fluctuation in such pump. Meanwhile, the maximum fluctuation amplitude appeared near the impeller outlet at IGVF=0.0%, while it appeared near the guide vane inlet under two-phase conditions. Furthermore, the maximum fluctuation amplitudes at IGVF=3.0%, 9.0%, 15.0% are 1.9, 2.9, and 3.3 times as large as that at IGVF=0.0%.
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