小型泵站吸水井进水管位置数值模拟

发布时间：2018-04-01 03:38

本文选题：小型泵站　切入点：吸水井　出处：《排灌机械工程学报》2017年11期

【摘要】：为了探究二次供水泵站吸水井内流动不稳定问题,研究了吸水井进水管位置对吸水井及泵吸水管内流动特性影响.采用Ansys-CFX流体仿真软件,对包括吸水井、进水管和泵吸水管在内的水体域进行三维定常数值模拟,对具有相同供水规模但进水管位置布置不同的2个泵站进行计算.分析了水泵进水条件和进水流道水力损失,结合其内部各断面速度分布情况,提出将进水条件差的泵站进水管位置进行更改的方案,并对更改后的水泵进水条件、水力损失以及内部流动情况进行对比分析.结果表明,泵站A吸水井进水管正对泵吸水管,吸水管内存在旋涡和扰流,并且各断面的轴向流速均匀度较小,平均流速偏流角较大,内部流动不稳定,水泵进水条件较差.将该泵站进水管位置分别向相邻2个泵位偏移1.375 m之后,该泵吸水管流道水力损失由6.579 cm分别降为3.301和3.258 cm,各断面处的轴向流速均匀度提高,平均流速偏流角降低,水泵进水条件得到改善.因此,为了改善水泵进水条件的稳定性,在小型泵站设计时应避免吸水井进水管正对泵的吸水管.
[Abstract]:In order to investigate the instability of the flow in the suction well of the secondary water supply pump station, the influence of the position of the intake pipe of the suction well on the flow characteristics of the suction well and the suction pipe is studied. The Ansys-CFX fluid simulation software is used to simulate the flow in the suction well. Three-dimensional steady numerical simulation was carried out in the water field of intake pipe and pump suction pipe. Two pumping stations with the same water supply scale but different intake pipe location were calculated. The water inlet conditions and hydraulic loss of inlet channel were analyzed. According to the velocity distribution of each cross section in the pump station, the scheme of changing the inlet pipe position of the pump station with poor influent condition is put forward, and the water inlet condition, hydraulic loss and internal flow of the pump after the change are compared and analyzed. The results show that, In the intake pipe of pumping station A suction well, there are vortex and turbulence in the suction pipe, and the axial velocity uniformity of each section is smaller, the average velocity deviation angle is larger, and the internal flow is unstable. When the inlet pipe position of the pump station is shifted to two adjacent pump positions for 1.375 m, the hydraulic loss of the suction channel of the pump decreases from 6.579 cm to 3.301 cm and 3.258 cm respectively, and the axial velocity uniformity increases at each cross section. In order to improve the stability of the inlet condition of the pump, the suction pipe of the inlet pipe of the suction well should be avoided in the design of the small pumping station.
【作者单位】：镇江市自来水公司;江苏大学国家水泵及系统工程技术研究中心;
【基金】：江苏省2014年度普通高校研究生科研创新计划项目(KYLX_1044)
【分类号】：TV675

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