基于CFD的泵安装位置对一体化泵站水力特性影响研究

Study on the Influence of Pump Installation Location on the Hydraulic Performance of Integrated Pumping Station by CFD

【目的】探究一体化泵站不同水泵安装位置对其内部流动特性以及水力性能的影响。【方法】以2个左右对称安置的潜水轴流泵为研究对象,在流速为198 m^3/h条件下,基于CFD分析泵安装中心距L、2台泵间距S等关键位置参数对一体化泵站流动特性影响。【结果】由于集水池内水流不对称和泵吸水影响,泵I与泵II的水力效率、泵进口流速均匀度有一定差异,其中泵I水力效率较泵II高4%左右,泵I进口流速均匀度较泵II高1%~4%。一体化泵站2台泵中心距的改变对水泵水力效率影响较小,而对泵吸水均匀性影响较大。一体化泵站2台泵间距的改变对水泵的水力效率影响较大,而当泵间距达到一定值后对泵吸入均匀影响较小,但集水池内流态随之更加恶化。【结论】在该一体化泵站背景下,建议安装2台泵的一体化泵站中心距L推荐值0.4 R,泵间距S推荐值0.6 R。

【Background】With the rapid development of urbanization, however, a large amount of urban water is also generated, and urbanization construction is seriously affected, which requires timely delivery by pumping stations. At present, most concrete pump stations are used, but they have the disadvantages of large floor area, long construction period, large investment, labor and material resources, etc. At the same time, it is difficult to move the concrete pump station after it was completed. Integrated pumping station is a relatively new type of pumping station, which is relatively simple to manufacture, install and maintain, with the implementation of the national sponge city strategy, the integrated pump station has been promoted at home and abroad and can be widely used. In addition, the construction of integrated pumping stations can solve certain local land shortages and environmental pollution problems. So far, many domestic scholars have researched integrated pumping stations. Previous studies on integrated pumping stations mainly focused on specific applications in engineering, and there was less research on the impact of submersible axial flow pumps and their installation locations.【Objective】In order to explore the influence of different pump installation positions on the internal flow characteristics and hydraulic performance of the integrated pumping station, 【Method】we take two submersible axial flow pumps arranged symmetrically as the research object, under a certain flow condition, and the physical model was established by UG software, and the pump body was meshed with ICEM CFD software. The horn inlet, outlet pipe, and collecting tank were meshed with Mesh software. The influence of key position parameters such as the distance between pump installation centers and the distance between two pumps on the flow characteristics of the integrated pumping station was analyzed based on CFD. 【Result】The results showed that the hydraulic efficiency of pump I and pump II was different due to the asymmetry of water flow in the sump and the influence of pump water absorption. The hydraulic efficiency of pump I was about 4% higher than that of pump II, and the uniformity of flow velocity at the inlet of pump I was 1%~4% higher than that of pump II. The change of the center distance of two pumps in the integrated pumping station had little effect on the hydraulic efficiency of the pump, but had great influence on the uniformity of water absorption of the pump. The change of the distance between the two pumps in the integrated pumping station had a great influence on the hydraulic efficiency of the pump, but when the distance reached a certain value, it had little influence on the suction uniformity of the pump, but the flow pattern in the sump becomes worse. 【Conclusion】In the context of this integrated pumping station, it is suggested that the recommended center distance L of the integrated pumping station with two pumps is 0.4 R, and the recommended distance S of the pump is 0.6 R.