旋流泵叶轮位置对性能影响与无叶腔流场测定  

Effect of Impeller Location and Flow Measurement in Volute of a Vortex Pump

作　　者：沙毅[1] 侯丽艳[2] 

机构地区：[1]浙江科技学院机械与汽车工程学院,杭州310023 [2]江苏大学能源与动力工程学院,镇江212013

出　　处：《农业机械学报》2010年第11期57-62,共6页Transactions of the Chinese Society for Agricultural Machinery

摘　　要：以研制32WB8-12型旋流泵为试验样机,通过改变叶轮轴向位置的外特性试验,得出泵qv-H、qv-P、qv-η和qv-NPSHc性能曲线变化规律;同时用5孔球形探针对泵无叶腔流场进行测量,得到流场5个测点绝对速度v、圆周速度vu、径向速度vr、轴向速度vz和静压ps变化情况。试验结果证明旋流泵qv-NPSHc曲线小流量范围与离心泵等呈相反趋势;随着叶轮伸入无叶腔尺度S的加大,泵扬程、效率和抗汽蚀性能均有提高。分析表明:无叶腔轴向旋涡运动为主流,存在回流运动;解释了外特性与内部流动参数之间的转化和因果关系;阐明旋流泵抽吸及扬程形成的原理。The experiments on changing the axial location of impeller and measurement of flow field in volute with five-hole probe were conducted on a self-built vortex pump（32WB8-12）.Based on the experiments,the qv-H,qv-P,qv-η,qv-NPSHc curves and the absolute velocity v,the circumferential velocity vu,the radial velocity vr,the axial velocity vz and the flow static pressure ps were obtained.The experimental results proved that the qv-NPSHc curve showed opposite tendency in the operating conditions of small charge compared with centrifugal pump and anti-cavitation were improved with the increase of the scale S that impeller was inserted into volute.The investigation also showed that the axial vortex was dominant flow in volute but with back-flow existing at the same time.The relationship between performance and parameters of the internal flow and the suction,head formation principles of vortex pump was explained.

关 键 词：旋流泵 叶轮位置 流场 特性 汽蚀余量 

分 类 号：TH314[机械工程—机械制造及自动化]