排灌机械工程学报2018，Vol.36Issue(3)：185-190,203,7.DOI:10.3969/j.issn.1674-8530.16.0205
蜗壳隔舌半径对离心泵性能及水力载荷特性的影响
Effects of tongue tip radius on performance and hydrodynamic load characteristics in centrifugal pump
摘要
Abstract
In order to investigate effects of volute tongue tip radius on performance and hydraulic load characteristics,unsteady flow fields in a centrifugal pump with the same impeller but different volutes in five tongue tip radii were simulated numerically.The hydraulic performance,pressure pulsation,blade loading and radial thrust on the impeller were acquired and analysed,and the predicted performance was compared with the experiment results,showing the numerical methods adopted in the paper were in a better accuracy.The results show that the tip radius has a little effect on the hydraulic performance,but the best hydraulic efficiency can be achieved at a certain tip radius.When the dimensionless tip radius TR (tip radius-to-base circle radius ratio) is in a range of 0.09-0.24,the loading across the blade pressure side and suction side is the minimum,i.e.the force acting on a blade exhibits the least variation from the leading to trailing edges.With increasing TR,the pressure fluctuation level in the pump reduces gradually,particularly the pressure amplitude at TR =0.03 is about 2 times the amplitude at TR =0.30 for blade passing frequency.The tip radius has a significant effect on impeller radial thrust.At the nominal flow rate,the radial thrust increases with increasing tip radius,and at TR =0.30 the thrust is about 2.5 times the thrust at TR =0.03.关键词
离心泵/隔舌半径/叶片载荷/径向力/数值模拟Key words
centrifugal pump/tongue radius/blade load/radial force/numerical simulation分类
农业科技引用本文复制引用
高波,杨丽,张宁,杜文强,袁霄..蜗壳隔舌半径对离心泵性能及水力载荷特性的影响[J].排灌机械工程学报,2018,36(3):185-190,203,7.基金项目
国家自然科学基金资助项目(51576090) （51576090）
江苏高校优势学科建设工程项目 （）
