Study on the induced noise of gas–liquid two-phase flow in a centrifugal pump

Abstract With a wide application of multiphase flow pumps, it is obvious that the flow-induced noise in the transportation of gas–liquid two-phase media is turning more and more into the focus. To study the influence of different inlet gas volume fractions (IGVFs) on the flow-induced noise in a pump, this study focused on the internal flow characteristics and the noise radiation characteristics of acoustic vibration coupling under gas–liquid two-phase flows. The results showed that the introduction of gas does not affect the main frequencies in the pump. The radiated noise mainly stems from the inner-wall pressure fluctuation of the pump. However, with the increase of IGVF, the liquid phase is squeezed by the gas phase, the flow stability in the pump becomes worse and causing the pump performance degradation. The flow induced noise in the pump increases correspondingly. The research results are of great significance to noise reduction studies and the design of quieter centrifugal pumps.