Numerically Simulating the Influence of Outlet Position and Diameter of Suction Pipe on Annular Jet Pump

【Objective】 Jet pump has a wide applications in many areas and water flow in it is affected by many design parameters. In this paper, we analyzed numerically the influence of the outlet position and diameter of the suction pipe on efficiency and flow field of annular jet pump. 【Method】 The numerical model was based on the turbulence model, and water flow in pumps with different configurations was simulated using the software FLUENT under different flow ratios. 【Result】 The outlet position of the suction pipe should not be far away from the inlet of the contraction section of the suction chamber when the flow ratio was 0.4~0.6; for what we studied, 2mm was the optimal distance. When the flow ratio was in the range of 0.1~0.3, increasing the spacing between the outlet and the inlet of the contraction section of the suction chamber could improve the efficiency of the pump. The efficiency of the pump is positively correlated with the suction tube diameter when other parameters are the same. 【Conclusion】 The change in flow ratio results in a change in the optimal outlet position of the suction pipe. The maximum efficiency of the annular jet pump and the flow ratio corresponding to the maximum efficiency point both increased, as the diameter of the suction pipe increased.