冲压式多级离心泵内流场数值模拟及水力性能研究
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摘要
冲压式多级离心泵由于采用冲压焊接工艺制造,外型美观、重量轻,比传统的铸造多级离心泵节能、节材、高效和环保;还有效地解决了低比转速及超低比转速离心泵在铸造工艺中无法实现的难题;极易实现生产的机械化和自动化;除此之外,在水力性能方面冲压式多级离心泵也优于铸造多级离心泵。由于目前还没有对冲压式多级离心泵整级的研究,因此本文的研究对改善冲压式多级离心泵的性能具有重要的意义。
本文采用数值模拟和实验验证相结合的方法,不仅通过现场实验得到了DL16冲压式多级离心泵的外特性参数,还利用数值模拟与实验结果的比较,确认了数值模拟的准确性。
本文得到的结论如下所示:
(1)综述了冲压式多级离心泵工作原理、结构、优点和国内外发展现状,介绍了商用CFD软件的发展,从控制方程、湍流模型、离散化方法和边界条件等多方面详细介绍了湍流流动数值模拟的理论基础。通过对各种模型的分析,确定适用于冲压式多级离心泵的数学模型,给出用于冲压式多级离心泵模拟的基础方程、算法及求解方式。
(2)对冲压式多级离心泵的叶轮、导叶和泵壳的主要参数进行水力设计,并建立三维模型。使用ICEM软件对各部分流场进行网格划分。利用CFX软件对冲压式多级离心泵的内流场进行数值模拟。在稳态下对不同工况的冲压式多级离心泵内流场进行模拟,得到压力分布和速度分布;在瞬态下对工况下的冲压式多级离心泵内流场进行模拟,得到六个旋转周期内的压力和速度变化情况,并对第五个周期内的六个时刻进行分析,得出了叶轮进出口总压、速度随时间变化的规律。
(3)通过实验仪器对冲压式多级离心泵的外特性参数进行测试,并和数值模拟的预测曲线进行比较,分析预测曲线随流量的变化趋势,误差形成的原因,为冲压式多级离心泵的性能改善提供依据。
(4)对冲压式多级离心泵在不同湍流模型下的外特性参数进行了比较,分析得出了最适合的湍流模型。
Compared with the foundary pump, the stamping multistage centrifugal pump which is made with stamping and welding crafts is more energy-saving, material-saving, environmentally friendly and efficient. The nice appearance and light weight are the advantages of the stamping pump. Moreover, the stamping craft solves the problem that it is hard to produce the same pump of low or super low specific speed with foundary craft. Also, the mechanization and automation produce of stamping pump are more easily implemented than foundary pump. In addition, the stamping pump is better than the foundary pump in hydraulic performance. As no research of whole stamping….is accomplished so far, the research of stamping multistage centrifugal pump is very important for improving the performance of pump.
The combination of numercial simulation and experimental study not only figures out the external characteristic parameter of DL16 stamping multistage centrifugal pump, but also confirms the veracity of numerical simulation by comparing the results of simulation and experiment.
The conclusions of the dissertation are shown below:
(1) The operation, structure, advantage and status quo of stamping multistage centrifugal pump at home and abroad is summarized. The development of commercial CFD software and the basic numerical simulation theory of turbulent fluid with control equation, turbulent model, discrete method and boundary condition are introduced. By comparing different models, the math…..is confirmed and the basic equation, calculation formula and numerical method is concluded.
(2) The three-dimensional model of stamping multistage centrifugal pump is built by designing the main sizes of impeller, diffuser and pump casing. The grid division of different flow fields is done with ICEM software. The inside flow field of stamping multistage centrifugal pump simulated by CFX software is aimed at concluding the pressure and velocity distribution in steady state and analyzing the changes of pressure and velocity in six rotating periods and six points in the fifth period in tansient state. Then the results how the total pressure and velocity changes as time passes are obtained.
(3) The external characteristic parameter of stamping multistage centrifugal pump is first tested with experimental equipment, and then compared with the predictive curves of numerical simulation to analyze how the predictive curves change with the flux, and to find out why the error between the experiment and simulation exists, which are very essential in improving the performance of the centrifugal pump.
(4) The optimal turbulent model has been worked out by comparing the external characteristic parameters of stamping multistage centrifugal pump in different turbulent models.
本文采用数值模拟和实验验证相结合的方法,不仅通过现场实验得到了DL16冲压式多级离心泵的外特性参数,还利用数值模拟与实验结果的比较,确认了数值模拟的准确性。
本文得到的结论如下所示:
(1)综述了冲压式多级离心泵工作原理、结构、优点和国内外发展现状,介绍了商用CFD软件的发展,从控制方程、湍流模型、离散化方法和边界条件等多方面详细介绍了湍流流动数值模拟的理论基础。通过对各种模型的分析,确定适用于冲压式多级离心泵的数学模型,给出用于冲压式多级离心泵模拟的基础方程、算法及求解方式。
(2)对冲压式多级离心泵的叶轮、导叶和泵壳的主要参数进行水力设计,并建立三维模型。使用ICEM软件对各部分流场进行网格划分。利用CFX软件对冲压式多级离心泵的内流场进行数值模拟。在稳态下对不同工况的冲压式多级离心泵内流场进行模拟,得到压力分布和速度分布;在瞬态下对工况下的冲压式多级离心泵内流场进行模拟,得到六个旋转周期内的压力和速度变化情况,并对第五个周期内的六个时刻进行分析,得出了叶轮进出口总压、速度随时间变化的规律。
(3)通过实验仪器对冲压式多级离心泵的外特性参数进行测试,并和数值模拟的预测曲线进行比较,分析预测曲线随流量的变化趋势,误差形成的原因,为冲压式多级离心泵的性能改善提供依据。
(4)对冲压式多级离心泵在不同湍流模型下的外特性参数进行了比较,分析得出了最适合的湍流模型。
Compared with the foundary pump, the stamping multistage centrifugal pump which is made with stamping and welding crafts is more energy-saving, material-saving, environmentally friendly and efficient. The nice appearance and light weight are the advantages of the stamping pump. Moreover, the stamping craft solves the problem that it is hard to produce the same pump of low or super low specific speed with foundary craft. Also, the mechanization and automation produce of stamping pump are more easily implemented than foundary pump. In addition, the stamping pump is better than the foundary pump in hydraulic performance. As no research of whole stamping….is accomplished so far, the research of stamping multistage centrifugal pump is very important for improving the performance of pump.
The combination of numercial simulation and experimental study not only figures out the external characteristic parameter of DL16 stamping multistage centrifugal pump, but also confirms the veracity of numerical simulation by comparing the results of simulation and experiment.
The conclusions of the dissertation are shown below:
(1) The operation, structure, advantage and status quo of stamping multistage centrifugal pump at home and abroad is summarized. The development of commercial CFD software and the basic numerical simulation theory of turbulent fluid with control equation, turbulent model, discrete method and boundary condition are introduced. By comparing different models, the math…..is confirmed and the basic equation, calculation formula and numerical method is concluded.
(2) The three-dimensional model of stamping multistage centrifugal pump is built by designing the main sizes of impeller, diffuser and pump casing. The grid division of different flow fields is done with ICEM software. The inside flow field of stamping multistage centrifugal pump simulated by CFX software is aimed at concluding the pressure and velocity distribution in steady state and analyzing the changes of pressure and velocity in six rotating periods and six points in the fifth period in tansient state. Then the results how the total pressure and velocity changes as time passes are obtained.
(3) The external characteristic parameter of stamping multistage centrifugal pump is first tested with experimental equipment, and then compared with the predictive curves of numerical simulation to analyze how the predictive curves change with the flux, and to find out why the error between the experiment and simulation exists, which are very essential in improving the performance of the centrifugal pump.
(4) The optimal turbulent model has been worked out by comparing the external characteristic parameters of stamping multistage centrifugal pump in different turbulent models.
引文
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