| Cite this article: | 赵婷,高雄发.基于CFD-DEM的旋流式固液两相流泵数值模拟与试验研究[J].灌溉排水学报,0,():-. |
| Zhaoting,gaoxiongfa.基于CFD-DEM的旋流式固液两相流泵数值模拟与试验研究[J].灌溉排水学报,0,():-. |
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| DOI：10.13522/j.cnki.ggps.2022124 |
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| Numerical simulation and experimental study of vortex solid-liquid two-phase flow pump based on CFD-DEM |
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Zhaoting, gaoxiongfa
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Jiangsu University
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| Abstract: |
| 【Objective】To explore the flow characteristics in vortex solid-liquid two-phase flow pump.【Method】Based on the CFD-DEM (Computational Fluid Dynamics-Discrete Element Method) coupled model, rapeseed particles were selected to conduct numerical simulations and solid-liquid two-phase flow experiments on the solid-liquid two-phase flow field of a vortex pump under different flow conditions and particle concentrations, to study the internal flow law and particle distribution characteristics of the vortex solid-liquid two-phase flow pump. 【Results】The study found that: under the condition of low flow rate, the vortex characteristics of the circulating flow in the lateral cavity are more obvious, the length of the inlet rotation and return flow is longer, and the disturbance to the inlet flow is larger. As the flow rate increases, the radius of the circulating flow decreases, the range of influence is reduced. The particles in the pump are subject to the combined action of the through flow and the circulating flow. The particles in the center of the tube wall are greatly affected by the through flow, and the particles pass through the lateral cavity and directly enter the impeller. The particles near the pipe wall are greatly affected by the circulating flow. The distribution of particles in the three sections along the axial direction in the impeller has obvious differences, and the number of particles gradually increases from the front end of the impeller to the rear cover. For the vortices with opposite rotation directions, the front vortex beam gradually dissipates after the V section, and the rear vortex beam rotates all the way to the eighth section. Under the action of the through flow and the circulating flow, the rapeseed particles are brought into the inlet area along the pipe wall by the rotating backflow. 【Conclusion】The existence of circulating flow leads to the low efficiency of vortex pump, but the circulating flow plays a great role in conveying particles, which makes the pump have strong conveying performance; the numerical simulation of the model pump is basically consistent with the experimental results, which verifies the reliability of the simulation. |
| Key words: Vortex solid-liquid two-phase flow pump, CFD-DEM coupling calculation, circulating flow, high-speed photograph, inlet rotating backflow |
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