Effects of the inlet gas volume fraction on the structural dynamic characteristics of gas‒liquid multiphase pumps

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The inlet gas volume fraction (IGVF) has a significant impact on the performance of the gas‒liquid multiphase pump. To explore the effects of different IGVFs on the performance of gas–liquid multiphase pump, it is taken as the research object and the deformation and stress of the impeller and pump shaft under pure water and different IGVFs are obtained. The results show that the maximum deformation of the impeller occurs at the blade trailing edge. The maximum deformation of the impeller under 20%, 30% IGVF is reduced by 9.97% and 16.79% compared to 10% IGVF, respectively. The maximum deformation of the pump shaft is decreased by 0.15% and 0.26%, respectively. The stress of the impeller at the connection between the blade trailing edge and the hub is the largest. The maximum stress of the impeller at 20% and 30% IGVF is reduced by 310 Pa and 600 Pa compared to 10% IGVF, respectively. The radial force and the axis trace are uniformly under pure water and are chaotic under different IGVFs. Under pure water condition, the maximum deformation and stress fluctuation on the impeller and shaft is smaller than that under different IGVFs. The amplitude of maximum deformation fluctuation on the impeller and shaft becomes smaller with the increasing IGVF.