流体机械

2020, v.48;No.580(10) 41-47

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多级离心泵水力性能数值模拟精度影响因素研究
Study on the Influencing Factors of Numerical Simulation Accuracy for the Performance Prediction of Multistage Centrifugal Pump

刘宇宁;王秀勇;刘志远;白小榜;
Liu Yuning;Wang Xiuyong;Liu Zhiyuan;Bai Xiaobang;College of Energy and Power Engineering,Lanzhou University of Technology;National Enterprise Technology Center,Chongqing Pump Industry Co.,Ltd.;

摘要(Abstract):

为了提高多级离心泵在全流量工况范围内水力性能的预测精度,以试验结果为基准,分别基于RNG k-ε和DDES两种湍流模型进行数值计算,探讨分析了流动是否定常、湍流模型的选取以及叶轮近壁面网格尺度对计算精度的影响。研究结果表明:非定常计算方法在全流量工况范围内的综合计算精度远高于定常计算方法;在相同的网格下,DDES湍流模型的综合计算精度明显优于RNG k-ε湍流模型;减小叶轮的近壁面网格尺度,能够使DDES湍流模型的计算精度进一步提高。
In order to improve the prediction accuracy of the hydraulic performance of a multistage centrifugal pump under full-flow working conditions,by using the test results as a judgment criterion,numerical simulations were performed based on the RNG k-ε and DDES turbulence models,and several factors that affect the calculation accuracy,such as flow instability,turbulence model selection,and near-wall mesh size of impeller were analyzed.The research results show that the comprehensive calculation accuracy of the unsteady calculation method was much higher than the steady calculation method under full-flow working conditions.With the same grid,the comprehensive calculation accuracy of the DDES turbulence model was significantly better than the RNG k-ε turbulence model.Reducing the near-wall mesh size of impeller can further improve the calculation accuracy of the DDES turbulence model.

关键词(KeyWords): 多级离心泵;性能预测;计算精度;湍流模型;网格尺度
multistage centrifugal pump;performance prediction;calculation accuracy;turbulence model;mesh size

Abstract:

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基金项目(Foundation): 国家自然科学基金资助项目(51866009)

作者(Authors): 刘宇宁;王秀勇;刘志远;白小榜;
Liu Yuning;Wang Xiuyong;Liu Zhiyuan;Bai Xiaobang;College of Energy and Power Engineering,Lanzhou University of Technology;National Enterprise Technology Center,Chongqing Pump Industry Co.,Ltd.;

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