湍流模型对多级离心泵性能预测的适用性

为了研究不同湍流数值模拟方法对多级离心泵性能预测的适用性,分别采用雷诺时均法(标准k-ε)、大涡模拟法(LES)和分离涡模拟法(DES)对具有相同结构参数的MD450-60×4多级离心泵内流场进行三维模拟,得到对应的计算扬程和水力效率。再根据经验公式将预测的水力效率转化为泵的运行效率,通过预测值与实验值的平均误差对比结果发现,标准k-ε、DES和LES湍流模型的扬程平均误差分别为14.91%、3.88%和4.41%,效率平均误差分别为7.82%、3.14%和2.86%。因此DES和LES模型计算的结果均满足多级离心泵数值模拟的精度要求。

Applicability of Turbulence Simulation Methods for Performance Prediction of a Multistage Centrifugal Pump

In order to study the applicability of the turbulence simulation method for performance prediction of a multistage centrifugal pump,Reynolds Average Navier-Stockes simulation( Standard k-ε),Large Eddy Simulation( LES) and Detached Eddy Simulation( DES) were used to simulate the flow field of the MD450-60 × 4 multistage centrifugal pump,and the predicted hydraulic efficiency was transformed into pump's operation efficiency by using empirical equations. The average head error of Standard k-ε,LES and DES turbulent model is 14. 91%,3. 88% and 4. 41% respectively,and the average efficiency error of Standard k-ε LES and DES turbulent model is 7. 82%,3. 14% and 2. 86% respectively. By comparing the numerical results and experimental ones,the results obtained from DES and LES show acceptable agreement.