Abstract：In order to investigate the gas-liquid two-phase flow characteristics in axial pumps, an axial pump with the specific speed of 1 500 was selected as study object. The two-phase flow in the pump was calculated based on the Eulerian-Eulerian inhomogeneous two-phase model at different flow rates and inlet gas volume fractions(IGVF). The performance of the axial pump was obtained under gas-liquid mixing flow conditions. Meanwhile, the two-phase flow pattern was indicated by analysis of the pressure and gas distribution and velocity distribution of two-phase in the impeller. The results show that the curves of the head and the efficiency display a slight decline with the increase of inlet gas volume fraction. Moreover, under the same air void, the pressure of the pressure face is greater than the suction surface pressure, and the pressure increases from the hub to the rim. And the gas is mainly concentrated on the suction surface of the impeller. With the increase of flow rate, the highest pressure is nearing the flange, the gas on the pressure surface of blade gradually increases, but that on the suction surface is opposite. The pressure surface gas is mainly accumulated on the inlet side and has a tendency to move towards the rim. At the same flow rate, the gas is still mainly concentrated on the suction surface of the impeller. With the increase of air void, the maximum pressure region of the pressure face has a tendency to move from the inlet side to the middle rim, then moves to the impeller outlet along the suction surface. In addition, with the increase of flow rate, the velocity of gas-liquid phase increases, and the flow separation phenomenon appears in the region close to the hub.
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