排灌机械工程学报2016，Vol.34Issue(6)：470-476,7.DOI:10.3969/j.issn.1674-8530.15.0101
基于 CFD 的离心泵叶片水力矩非定常特性
Unsteady characteristics of blade hydraulic moment in centrifugal pumps with CFD
摘要
Abstract
Unsteady characteristics of blade hydraulic moment in centrifugal pumps are key factors having strong influence on pump operation.There is few literature on the unsteady hydraulic moment currently.Thus,with CFD technology,the 3D unsteady flow numerical simulations were executed on a model of XS50 -160 /7.5 pump for capturing the flow character inside the impeller under 5 different operation conditions.An experiment has been done for verification of the validity and accuracy.The hydraulic moment fluctuation and the pressure fluctuation on blade surface under 5 different operation conditions were obtained with the simulation.The results of the simulation show that the blade passing frequency plays a dominant role in the fluctuation of the hydraulic moment at design and off-design conditions under various operating conditions.Meanwhile,the rotating frequency of impeller plays a dominant role in the pressure fluctuation in the impeller at design and off-design conditions.When the frequency is higher than the blade passing frequency,the strength of hydraulic moment pulsation and pressure pulsation on the surface of blade are both relatively weak.At design point,the minimum RMS of the hydraulic moment fluctuation occurred.With the deviation from the design point,the RMS value goes higher.The RMS values at low flow rate condition and at high flow rate condition are almost sym-metrically distributed about the design point.The pressure fluctuation in the pressure surface of the blade is stronger than that in the suction surface,that in the outlet zone is stronger than in the inlet zone.关键词
离心泵/压力脉动/叶片水力矩/非定常流动Key words
centrifugal pump/pressure fluctuation/blade hydraulic moment/unsteady flow分类
农业科技引用本文复制引用
郭义航,袁寿其,骆寅,孙慧..基于 CFD 的离心泵叶片水力矩非定常特性[J].排灌机械工程学报,2016,34(6):470-476,7.基金项目
国家自然科学基金资助项目（51409125）；中国博士后科学基金资助项目（2014M551515）；江苏高校优势学科建设工程项目 （）
