排灌机械工程学报2016，Vol.34Issue(12)：1045-1050,6.DOI:10.3969/j.issn.1674-8530.16.0011
轮毂比对轴流式叶轮水力性能的影响
Effects of hub/tip ratio on hydraulic performance of axial-flow pump
摘要
Abstract
To study the effects of hub/tip ratio on the hydraulic performance of axial-flow impeller,4 impellers with different hub/tip ratios were optimally designed and the specific speed of these impellers are 743 .The optimization design of axial-flow impeller used multidisciplinary optimization software iSIGHT,Sequential Quadratic Programming (SQP),a gradient optimization algorithm,meanwhile en-sured a constant design flow and head,and changed cascades dense degree of each airfoil section and size of airfoil placed corner to achieve optimal efficiency.Numerical simulation software CFX was used for multidisciplinary analysis,N-S equation based on Reynolds-averaged and standard k-εmodel were used in the optimization process to predict head,efficiency and cavitation margin value required of impellers.Performance curves of impellers with different hub/tip ratios were calculated by numerical simulation,and then the effects of hub/tip ratio on the hydraulic performance of axial-flow impellers with the same specific speed were analyzed.The results show that the larger the hub/tip ratio,the higher the efficiency of impellers,and the worse the cavitation performance.The effects on cavitation performance are more significant,the biggest difference of NPSHR is 0.9 m,in contrast,the hub/tip ratio has less effects on efficiency,the highest difference for efficiency is only around 0.3%.The larger the hub/tip ratio,the larger the slope of head performance curve;the higher the maximum head,the larger the range of head of saddle area,at the same time,with the increasing of hub/tip ratio,the range of efficient area will become narrower,and distribute to the side of a small flow.关键词
轴流泵/轮毂比/iSIGHT/CFX/水力性能Key words
axial-flow pump/hub/tip ratio/iSIGHT/CFX/hydraulic performance分类
机械制造引用本文复制引用
石丽建,汤方平,谢荣盛,谢传流..轮毂比对轴流式叶轮水力性能的影响[J].排灌机械工程学报,2016,34(12):1045-1050,6.基金项目
国家自然科学基金资助项目（51376155）；“十二五”农村领域科技计划项目（2012BAD08B03－2）；江苏省研究生科研创新计划项目（KYLX15＿1365）；江苏高校优势学科建设工程资助项目 （）
