带有前置搅拌装置污水泵的流动特性研究  

Research on the Flow Field and Abrasion Characteristics in Sewage Pump with Pre-mixing Device

作　　者：郎涛[1] 施卫东[1] 陈刻强 李伟[1] 程成[1] 

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013

出　　处：《流体机械》2015年第11期29-33,共5页Fluid Machinery

基　　金：江苏省"333工程"科研项目(BRA2013188);江苏省"六大人才"高峰项目(HYZB-002);江苏省产学研联合创新资金前瞻性研究项目(BY2013065-03);镇江市农业支撑项目(NY2013031);江苏高校优势学科建设工程项目

摘　　要：针对污水池清淤问题,在一潜水排污泵进口处设置一搅拌装置,研究带有前置搅拌装置污水泵在污水池中的流动特性。研究表明,基于CFD计算的污水泵外特性结果与试验结果基本吻合,数值模拟结果具有较好精度;对比无前置搅拌装置的潜水排污泵,发现装有搅拌装置后泵的轴功率升高,效率下降;对整个污水池系统的流场进行分析,发现污水池内出现旋涡及附壁效应,说明泵前设置搅拌装置有利于池底清淤;固相颗粒主要聚集于叶轮流道中下游及蜗壳周边壁面处,叶片工作面的进口、出口以及叶片背面中间部位磨损稍微严重,而叶片流道中间部位及靠近叶片背面出口处的磨损相对轻微。For cesspool dredging issue, a pre-mixing device was installed at the inlet of a sewage pump, which was placed in a water tank to study the flow field and abrasion characteristics. To further ensure the accuracy of the simulation results, the sewage pump was produced and tested. Comparison between numerical simulation and experimental results is presented to prove the accuracy of numerical simulation. Then CFD was done on the pump in different conditions, and we found that when the pump is equipped with a stirring device, the shaft power will increase and the efficiency will decrease. Finally, by analyzing the entire system of the cesspool, we found that there are vortexes and the Coanda effect in the tank, indicating that the pump set with premixing device is in favor of dredging the bottom. Solid particles are mainly gathered in the middle and downstream of the impeller passages and at the volute peripheral wall surfaces, while the solid particles on pressure surfaces are focused at outlet and that on suction surfaces are mainly concentrated in the middle of the flow channel near the inlet.

关 键 词：离心泵 固液两相流 搅拌流场 CFD 

分 类 号：TH311[机械工程—机械制造及自动化]