排灌机械工程学报
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排灌机械工程学报  2012, Vol. 30 Issue (6): 627-631    DOI: 10.3969/j.issn.1674-8530.2012.06.002
泵理论与技术 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
级间间隙对新型井泵性能的影响
 施卫东, 王川, 司乔瑞, 徐静, 陆伟刚

(1.江苏大学流体机械工程技术研究中心, 江苏 镇江 212013; 2.江苏大学管理学院, 江苏 镇江 212013)
Influence of interstage seal clearance on performance of newtype well pump
 SHI  Wei-Dong, WANG  Chuan, SI  Qiao-Rui, XU  Jing, LU  Wei-Gang
(1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China;
2. School of Management, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
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摘要 为了研究级间间隙对多级井泵性能及流场的影响,以采用叶轮极大直径设计法设计的QS-40-30-55新型井泵为例,应用Fluent软件对不同级间间隙下的模型泵进行了全流场数值模拟.分别从泵的外特性及内部流场分析了级间间隙对泵整机性能的影响,结果表明:在同一流量下,随着间隙的增大,泵的扬程与效率均降低,轴功率基本保持不变;导叶出口处的液体会沿着级间间隙回流,然后通过叶轮与导叶之间的空间流回到导叶中,使得导叶出口及下一级叶轮进口处的流动出现紊乱,增大了流动损失,从而使得泵的性能下降.通过样机试制及试验发现:泵的最高效率点偏向小流量,但也满足国家标准要求;在额定流量下采用两级全流场数值模拟,由于考虑了圆盘摩擦损失及级间间隙泄漏损失,其预测值与试验值相当接近,误差在1%以内,验证了数值模拟方法的正确性.研究结果对新型井泵的优化设计具有一定的参考价值.
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施卫东
王川
司乔瑞
徐静
陆伟刚
关键词井泵   级间间隙   内流场   性能   数值模拟     
Abstract: In order to explore influence of interstage seal clearance on the performance and flow field of multistage well pumps, a newtype well pump QS-40-30-55 was taken as the investigation model; the whole flow field in the pump with different seal clearances were stimulated with Fluent. Effects of the clearance on the overall performance and internal fluid flow field in the pump were analyzed. The results showed that the head and efficiency of the pumps are reduced, while the shaftpower remains unchanged with increasing clearance at the same flow rate. A stream of liquid in the guide vane exit flows back into the impeller hub along the interstage seal clearance and then it moves into the guide vane through the side chamber between the impeller and the guide vane, causing a disturbance in the flow at the guide vane exit and the entrance to the next stage impeller, which increases the hydraulic losses and degrade the pump performance. The experimental results of the prototype of the pump show the best efficiency point occurs at a lower flow rate than the specified one, but it is still in accord with the National Pump Test Standard of China. Because the impeller disc friction loss and the leakage loss through the interstage seal clearance have been involved in the computational model, the estimated performance by CFD is in very good agreement with experiments (error is less than 1%), confirming the validity of CFD numerical simulation approach. Those results might be instructive for optimal design of newtype well pumps, especially whose impellers are designed by means of the impeller diameter maximization method.
Key wordswell pump   interstage clearance   internal flow field   performance   numerical simulation   
收稿日期: 2012-04-12; 出版日期: 2012-11-30
基金资助:

安徽省自然科学基金资助项目(11040606M107); 江苏高校优势学科建设工程项目; 江苏省普通高校研究生科研创新计划项目(CXLX120642)

通讯作者: 施卫东(1964—),男,江苏如东人,研究员,博士生导师(wdshi@ujs.edu.cn),主要从事流体机械及工程研究.   
作者简介: 王川(1987—),男,湖北鄂州人,博士研究生(通信作者,wangchuan198710@126.com),主要从事泵理论与设计研究.
引用本文:   
施卫东,王川,司乔瑞等. 级间间隙对新型井泵性能的影响[J]. 排灌机械工程学报, 2012, 30(6): 627-631.
SHI Wei-Dong,WANG Chuan,SI Qiao-Rui et al. Influence of interstage seal clearance on performance of newtype well pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(6): 627-631.
 
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