Abstract
To explore the pressure fluctuation characteristics in a mixed-flow pump handling a gas-liquid two-phase flow, an unsteady simulation was carried out with ANSYS CFX for the whole flow passage when the inlet gas void fraction (IGVF) was 0%, 5%, and 10%, respectively. Under pure water conditions (IGVF = 0%), the reliability of the simulation was verified by comparing with the experiment in both aspects of external characteristics and fluctuation. Through the implementation of the fast Fourier transform (FFT) algorithm, the characteristics of the pressure fluctuation in the impeller and the guide vane were obtained at different IGVF conditions. The results demonstrate that pressure fluctuations exist under different IGVF conditions due to the rotor-stator interaction and the gas-liquid phase interaction, and the intensity of the fluctuation is firstly enhanced, and then weakened, along the streamwise direction with the maximum located near the impeller outlet. The relationship between the gas content and the pressure fluctuation was analyzed, and it is shown that the regional pressure fluctuation will be intensified only if the gas content therein reaches a certain level and the local phase interaction is strong. In addition, the pressure fluctuation in both the rotor-stator interaction region and the guide vane may be effectively inhibited under small IGVF conditions.
Highlights
The gas-liquid two-phase transport exists widely in petroleum, chemical engineering, food, urban water supply, nuclear industry, etc
The maximum values of rotor-stator interaction region, the influence of the rotor-stator interaction is weak; on the other pressure fluctuation coefficients of the points C1–C4 are located near the impeller outlet under hand,different taking into the rotation effect of impeller, interaction mode betweenand the gas IGVFaccount conditions, which are closely related the to the rotor-stator interaction the and liquidcomplicated is more complicated as and this will lead to the appearance of complex gas-liquid flow therein
(1) Influenced by the rotor-stator interaction and the gas-liquid phase interaction, pressure fluctuations occur in three inlet gas void fraction (IGVF) conditions and the dominant frequency of the pressure fluctuations occur in three IGVF conditions and the dominant frequency of the pressure fluctuation of point C4 is 6 fn
Summary
The gas-liquid two-phase transport exists widely in petroleum, chemical engineering, food, urban water supply, nuclear industry, etc. The energy performance of multiphase pumps handling gas-liquid two-phase flows will have a significant impact on the economic benefits of the relevant industries [1,2,3,4]. Research has been conducted on the pressure fluctuation of the gas-liquid two-phase flow, especially for the two-phase flow in the pipeline. A NACA65 axial flow pump handling gas-liquid performance and flow instability. A NACA65 axial flow pump handling gas-liquid two-phase simulated byby. The centrifugal and axial typesdone of pumps are used to transport the few gas-liquid flow, not much relevant research has been on mixed-flow pumps. An unsteady flow few studies have been performed on the pressure fluctuation in multiphase pumps.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
