双流道污水泵叶轮内部三维湍流流动的数值模拟  

Numerical Simulation of 3-D Turbulent Flow Fields through Double-channel Passage Impeller

作　　者：张静[1] 齐学义[1] 侯祎华[1] 王建森[1] 

机构地区：[1]兰州理工大学流体动及控制学院,兰州730050

出　　处：《农业机械学报》2009年第1期64-68,55,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：甘肃省科技攻关计划项目(2GS047-A52-011)

摘　　要：基于Reynolds时均化的N-S方程和标准的k-ε两方程湍流模型,运用流场计算软件Fluent,在不同工况下对QW950-15-55型双流道污水泵叶轮蜗壳耦合流场进行了数值模拟研究,捕捉到了双流道叶轮内流的重要特征。依据计算结果,主要分析了设计工况时双流道叶轮内部的速度和压力分布情况。叶轮内压力分布与叶片式离心泵的数值模拟是类似的;在偏离设计的大流量工况,叶轮流道内的流动呈现明显的不对称性;叶轮内部流动为混合螺旋流,由轴向旋涡作用引发的相对速度旋涡的涡核位置靠近后盖板和压力侧;叶轮出口的压力和绝对速度分布呈现明显的周期性,其周期性与叶轮流道的周期性是对应的;静压周向分布的轴向不对称性较小,而速度周向分布的不对称性则较大。对比试验与数值模拟的扬程和水力效率值,数据基本吻合。The internal flow in impeller and volute of QW950 - 15 - 55 double-channel passage pump was investigated. Based on the Reynolds-averaging N - S equations and standard k-ε two-equation turbulent model, the simulations of turbulent flow between impellers are performed by using the flow computing software Fluent under different operating conditions. Important flow features were obtained. With the computing result, the distribution of velocity and pressure in the impeller was analyzed. The pressure and velocity distribution in impeller are similar to those in general centrifugal pump. Obvious asymmetry of flow field was observed in impeller in case of large flow operating condition. The internal flow in impeller is mixed spiral flow and the vortex core resulted by relative eddy is close to the back blind flange and pressured side. The circumferential distribution of pressure and absolute velocity at the outlet of impeller is periodic, which is corresponding to the periodicity of the passages of impeller. The asymmetry of pressure is relatively weak but that of velocity is strong. Comparing the data of efficiency with the head produced by experiment and CFD, the result mainly tallies.

关 键 词：叶轮 双流道 蜗壳 三维湍流 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化]