【作者】 赵啸冰；

【导师】 许洪元；

【作者基本信息】 清华大学 ， 流体机械及工程， 2002， 硕士

【摘要】 本文研究了渣浆泵内吸入口段、叶轮区、蜗壳以及扩散管延长段的清水流场的流动状况，并且在此基础上用拉格朗日法模拟了固体单颗粒的运动轨迹，最后得到规律性的结论，与实际工程相吻合。本文的研究内容包括：对渣浆泵的清水流场进行多工况的计算，包括建立模型，划分网格，采用比较成熟的κ-ε模型来封闭求解N－S方程。对封闭的方程组进行数值求解，采用有限差分法进行离散，压力修正使用了SIMPLEC算法。本文对渣浆泵的在5个工况下（包括设计工况）的清水流场进行了计算，得到了描述流场的速度、压力、紊流强度等参数场的分布情况，最后计算了泵的运行性能曲线来校核计算的可靠性。在清水流场计算的基础上，采用拉格朗日法计算出多种情况下颗粒的运动轨迹，给出了颗粒运动的直观表示，研究了离心式渣浆泵内固体颗粒的运动规律。通过对不同影响因素的考察，分析了颗粒直径、密度等变量对固体颗粒在渣浆泵内的运动轨迹的影响。与此同时，本文还对不同工况下颗粒的运动轨迹进行了模拟和分析。本文总结了渣浆泵内流体和颗粒的运动规律，能够合理的解释渣浆泵的磨损问题，为改善渣浆泵的磨损和改良渣浆泵的设计提供了依据，并为进一步研究离心泵内的固液两相流动打下了基础。更多还原

【Abstract】 The current field in the centrifugal pump, which includes entrance pipe, impeller, volute and outlet pipe, is simulated and analyzed in this paper, and the solid particle trajectory is computed by using Lagrange Method under the flow field. Some conclusions about the particle trajectory are given and validated by the engineering practices. The main achievements are listed as follows:After building the model of pump and partitioning the grids, the flow fields under some work conditions including design condition are calculated by solving the N-S equation group with developed κ-εmodel. The algorithm of SIMPLEC is used to correct the compression. Computing about five work conditions of slurry pump, the fields of velocity, compression and turbulence intensity are obtained, and the pump performance curves are also achieved to check the computation credence.Based on the results of flow fields, particle tracks in varied conditions are achieved by using Lagrange Method. The results are given visualized. Some particle motion patterns are given involving the effect of particle diameter, density and work conditions, as so on.<WP=5>The work of this paper will be helpful to understand the flow in slurry pump and the trajectory of solid particles; the motion patterns given in paper can explain some phenomena about abrasion in slurry pump and also prepare the further development of solid-liquid two phase flow well.更多还原