Numerical simulation of hydraulic characteristics of wellbore pump installation
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Abstract:
Based on the k-epsilon turbulent flow model and the Reynolds-averaged N-S equation, we performed three-dimensional flow numerical simulation on the wellbore pump installation using commercial CFD software. Through the analysis of the performance curve, we found that the pump was more efficient when the diameter of the inlet pipe was larger. By comparing the loss of inlet water and outlet water, we found that the inlet water loss would increase with the flow rate, and the outlet water loss would first decrease and then increase with the increase of flow rate. By analyzing the VX cloud and flow graph, we found that when the diameter of the inlet pipe was relatively small, the flow velo city was relatively large, and the vortex was also large. The vorticity of the vortex was more than twice of that when the pipe diameter was large. Analysis on the distributio nuniformity of axial flow velocity at the impeller inlet section revealed that the flow velocity uniformity of the impeller inlet was relatively high when the inlet pipe was large, but the difference was not obvious when the flow rate exceeded 330 L/s. From the calculation of the average vorticity at the inlet section of the bell-tube, we found that the average vort icity at the bell-tube inlet section would increase with the flow rate, and it would decrease by more than20% when the inlet pipe diameter was large.
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