低比转数离心泵内部非定常流动特性数值预测  

Numerical Prediction of Inner Flow Unsteadiness in a Low-specific Speed Centrifugal Pump

作　　者：裴吉[1] 王文杰[1] 袁寿其[1] 孟凡[1] 陈佳[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》2014年第1期79-83,88,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：'十二五'国家科技支撑计划资助项目(2011BAF14B04);国家自然科学基金资助项目(51239005;51009072);江苏大学高级人才启动基金资助项目(13JDG084)

摘　　要：为了深入研究低比转数离心泵在运行过程中内部的非定常不稳定流动现象的内在机理,采用CFD数值模拟的方法对模型泵内部三维湍流流场进行数值计算,并根据离心泵速度三角形推导了用来直观定量衡量流动非定常强度的时均非定常强度系数。通过分析该时均非定常强度系数在低比转数模型泵中的分布可知,叶轮叶片背面附近流场非定常性较强,且流体流经叶片后缘产生的尾迹现象同样随时间波动明显。蜗壳流道出口管及靠近叶轮出口处流动非定常性较强。To decrease the flow unsteadiness in pump hydraulic design procedure as much as possible, the inner flow unsteadiness intensity and distribution should be understood. For analyzing the unsteady flow phenomenon in low-specific speed centrifugal pump, CFD software was employed to simulate the 3-D unsteady fluid flow in the pump, and meanwhile the time-averaged unsteadiness intensity coefficients were defined based on velocity triangle in order to directly depict the flow unsteadiness. By analyzing the distributions of the intensity coefficients in the low-specific speed pump, the results show that stronger flow unsteadiness can be found near blade suction side, and in the wake flow area the flow varies with time strongly. In addition, strong flow unsteadiness is also significant in the discharge tube and the area near impeller outlet of the volute.

关 键 词：离心泵 低比转数 非定常流动 数值计算 

分 类 号：TH311[机械工程—机械制造及自动化] O351.2[理学—流体力学]