排灌机械工程学报2016，Vol.34Issue(9)：742-747,6.DOI:10.3969/j.issn.1674-8530.16.0087
叶片包角对高比转数离心泵性能的影响
Effects of blade wrap angle on performance of high specific speed centrifugal pump
摘要
Abstract
In order to investigate the influence of blade wrap angle on high specific speed centrifugal pump performance under design condition,a single-stage,end-suction centrifugal pump with a specific speed of 185 is taken as the study object.Firstly,five impellers with 110°,115°,120°,125°and 130°wrap angles are designed when the rest geometric parameters remain unchanged,then the flow fields in the pump with these impellers are calculated numerically by using ANSYS CFX 14.5.The re-sults show that the blade wrap angle has a significant impact on external characteristics.If the wrap an-gle is oversized,the head and the hydraulic efficiency will decline.When the wrap angle increases to 130°,the best efficiency point migrates about 20% to part-load region;in addition,the low pressure zone at the impeller inlet is enlarged with increasing wrap angle,leading to cavitation more easily. When the wrap angle increases from 110°to 115°,the flow in the volute is smoother.However,when the wrap angle is 125°,an obvious vortex region with low velocity appears around the tongue,further it is expanded and moved to the impeller outlet gradually with increasing wrap angle.Also,when the wrap angle reaches to 120°,the pressure fluctuation amplitude at every monitoring point is relatively low,showing that there is an optimal wrap angle for rotor-stator interaction.The performance of the pump with 120°wrap angle is measured and it is found that the results of numerical simulation are in agree with the measurements.This study has provided some reference significance to the development of a high specific speed centrifugal pumps with better performance.关键词
离心泵/叶片包角/高比转数/压力脉动/数值计算Key words
centrifugal pump/blade wrap angle/high specific speed/pressure fluctuation/numerical calculation分类
农业科技引用本文复制引用
黄茜,袁寿其,张金凤,张霞..叶片包角对高比转数离心泵性能的影响[J].排灌机械工程学报,2016,34(9):742-747,6.基金项目
国家自然科学基金资助项目（51009072）；江苏高校优势学科建设工程项目 （）
