Abstract To explore the flow field law of the outlet ball valve of the new rotor oilgas mixed pump, a 3D model of ball valve flow field was established. Using Fluent software, combining standard turbulent model and multiphase flow technology together, adopting SIMPLE algorithm, a 3D gasliquid doublephase flow field in outlet ball valve of new rotor oilgas mixed pump was numerically simulated. With gas fraction of 25%, 50% and 75% and valve′s opening height at 3, 5 and 7 mm respectively, velocity field, pressure field and the distribution of liquid and gas was analyzed. The law of valve′s opening height and different gasliquid ratio′s effect on outlet ball valves in the process of gasliquid mixing was discussed. The simulation results show that, the greater the opening height, the smaller the pressure difference between ball valves.The gap flow velocity decreases as the open height increases. Gas mainly flows in the vicinity of the valve ball in the process of gasliquid mixing. At the same opening height, gasliquid ratio has little effect on gap flow velocity. The experiment directly shows flow field forms in the ball valve and, to a certain degree, reveals the law of gasliquid flow in the ball valve, providing a theoretical guidance for the design and optimization of new rotor oilgas mixed pump outlet ball valve.
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