低比转数离心泵叶轮内能量转换特性  

Energy Conversion Characteristic within Impeller of Low Specific Speed Centrifugal Pump

作　　者：张翔[1] 王洋[1] 徐小敏[1] 王洪玉[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013

出　　处：《农业机械学报》2011年第7期75-81,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：江苏省科技服务业发展计划资助项目(BM2008375);江苏大学博士创新计划资助项目(CX10B_004X)

摘　　要：对比转数为60的离心泵内部流场进行数值模拟计算,从叶轮做功过程和能量损失过程两方面分析了叶轮内能量转换特性。将叶轮按径向尺寸分为8个区域,展示了不同工况、不同区域中压力和粘性力做功大小、功率密度分布、湍动能耗散率分布、能量损失组成及分布等能量转换相关特征。结果表明,叶轮进口区域能量转换效率相对较低且受叶片进口安放角影响,叶轮中部区域是叶轮做功和流体获得能量的关键区域,叶轮出口区域对叶轮性能有显著影响,壁面摩擦损失是叶轮内能量损失的主要组成部分。The flow field of a centrifugal pump with the specific speed of 60 was computed by CFD method,and the analysis was made to the characteristics of energy conversion within impeller from aspects of working process and energy loss process.The impeller was divided into 8 regions by the radius.Under different operating conditions,characteristics in each region were demonstrated the power of pressure and viscous force,distribution of power density and turbulence dissipation rate,composition and distribution of the energy loss.The results indicated that efficiency was poor and it was influenced by the inlet blade angle in inlet region of the impeller,the middle region of impeller was important to the energy conversion,the outlet region of impeller had appreciable impact on the performance,and fiction loss was the main component of the energy loss.

关 键 词：离心泵 能量转换 低比转数 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化]