高比转数离心式潜水排污泵设计与试验  

Design and Experiment of High Specific Speed Centrifugal Submersible Sewage Pump

作　　者：朱荣生[1] 曹梁[1] 龙云[1] 朱冬欣 付强[1] 王振伟[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013 [2]南京航空航天大学能源与动力学院,南京211106

出　　处：《农业机械学报》2015年第4期47-52,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51379091);江苏省自然科学基金资助项目(BK20130516);江苏高校优势学科建设工程资助项目(PDPA)

摘　　要：针对350QW 1500-16-90型排污泵,运用CFD软件ANSYS CFX对采用不等扬程水力设计方法 2种方案和传统等扬程水力设计方法 1种方案在不同工况下泵内部流动进行模拟分析,做出性能预测,并选取最优方案进行试验。研究结果表明:采用不等扬程水力设计方法可以减小叶轮工作面低压区和回流,从而使泵有均匀的叶片出口静压及流速分布;利用CFD技术所获得的扬程、效率的预测曲线和试验所得到的性能曲线变化规律一致,无马鞍区,无过载现象发生,满足设计要求,表明数值模拟较准确,对高比转数排污泵设计有一定指导意义;随着流量的增加,扬程曲线斜率绝对值增加,泵的最高效率点出现在1 699.93 m3/h时,最高效率为80.256%,最高效率点向大流量偏移,大流量区域效率曲线平缓,0.9Q^1.3Q为高效率区,符合排污泵在大流量工况下运行的工作特性。To improve the performance of high specific speed centrifugal non-clogging submersible sewage pump, the 350QW 1500 - 16 -90 sewage pump was designed by using unequal head hydraulic design method and traditional equal head hydraulic design method. Three different optimization plans were proposed and CFD software ANSYS CFX was applied to analyze the interior flow field of each plan under different conditions, the performance was predicted and the best plan was selected to test by internal flow characteristics and performance curves. It was demonstrated that using unequal head hydraulic design method can reduce the area of low pressure of impeller working face and backflow, central runner had the lowest relative velocity so that blade outlet of the pump had a uniform static pressure and velocity distribution. The predicted curve obtained by CFD technology and performance curves obtained by experiment of head and efficiency had the consistent variation. There was no saddle zone and overload phenomenon, which indicated that it satisfied the design requirements and the numerical simulation was accurate and it had guiding significance for the high specific speed sewage pump design. The absolute value of head curve slope increased with the increase of flow, the maximum efficiency point was occurred at 1 699.93 m3/h and maximum efficiency was 80. 256%. Maximum efficiency point shifted to the large flow, where the efficiency curves changed gently, 0.9Q - 1.3Q was high efficiency area which was conformed to be the operating characteristics of the sewage pump running at high flow conditions, it was helpful to improve the current situation of high energy consumption at sewage treatment for using unequal head hydraulic design method.

关 键 词：排污泵 高比转数 设计方法 数值模拟 试验 

分 类 号：TH311[机械工程—机械制造及自动化]