Pneumatic lifting pump, as one of the ideal new methods for mining and upgrading, has obvious advantages such as simple structure, safety and reliability. The research of it has important scientific value and engineering significance. Based on Fluent simulation software, using Euler model and SST k-ω turbulence model, with the help of UDF self-programming, the influence of variable air volumes-linear opening, linearly closing on the hydraulic characteristics of the air-water lifting pump is discussed. The results are shown as follows. 1) In the slow linear opening mode of the gas flow, the liquid lifting flow increases, the change trend of it is slower than that of fast linear closing mode. 2) In the slow linear closing mode of the gas flow, the liquid lifting flow reduces, the change trend of it is slower than that of fast linear closing mode. These research results will lay the theoretical foundation for the application of pneumatic lifting technology in river dredging, sewage treatment, oil extraction and other fields.

In order to study the influence of bubble size and distance on the interaction between bubbles, this paper discussed the rising movement characteristics of triple bubbles in static water based on Fluent software. By analyzing the rising track, flow fields and velocity of bubbles, the results show that, when bubble diameters are 4mm, 4mm, 4mm, the distance between the left bubble and the middle bubble is smaller than the minimum coalescence distance, and they coalesce. When bubble diameters are 6mm, 4mm, 4mm, the velocity and track of the small bubble at the bottom will be affected by the wake of the big bubble as the big bubble rises, but they do not coalesce. When bubble diameters are 2mm, 6mm, 2mm, the smaller bubbles on both sides are attracted by the middle bubble and they coalesce; there is almost no vertical rise or deviation process.

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