新型流道式潜水排污泵固液两相流动研究

发布时间：2018-03-24 08:15

本文选题：新型流道式泵　切入点：通过性能　出处：《合肥工业大学》2017年硕士论文

【摘要】：流道式潜水排污泵,因通过能力良好等优良特性被广泛应用于污水处理等行业,特别适用于介质颗粒、杂质纤维较多的特殊场合。但是,该类潜水排污泵也存在着磨损、缠绕、堵塞、效率低等缺点,因此,有必要进行新型流道式潜水排污泵的研究。本文应用数值分析与试验相结合的研究方法,对新型流道式潜水排污泵的的各项性能展开了细致的研究,具体研究结果如下:(1)对新型流道式叶轮的设计思想进行了简要描述,阐释了新型的水力设计形式对抗缠绕性能的影响。在三维建模的基础上,将新型流道式叶轮与具有相同功率、比转速、转速的传统型叶轮进行通过能力对比,新型叶轮的最大过球直径上升40%。对计算域几何体进行了多面体网格划分并,建立了计算模型。(2)设计了外特性试验方案,开展了外特性试验,最终获得了泵的外特性试验数据,该结果与数值计算结果进行对比,两者吻合度较高,这也说明应用CFD技术进行泵内部流动分析具有可参考性。(3)对清水状态下泵内部流场进行了详细的分析,对比分析了不同工况下泵内部流场的结构特性与演变过程;对固液两相状态下泵内流动规律进行了细致的研究,分析比较了不同固相浓度、颗粒大小、流量值等对两相流动规律的影响;最后,预测了叶轮表面易磨蚀区域的分布。(4)开展了新型流道式泵的磨蚀试验,对叶轮磨蚀区域进行了定性分析与定量分析;总结了叶轮表面磨蚀区域分布规律;试验中的易磨蚀区域分布与两相流模拟中预测的结果相似。应用3D扫描技术,基于点云之间的偏差分析法对磨蚀结果进行定量分析,最大磨蚀量主要出现在:叶片进口边及其向工作面延伸区域、叶片出口边附近区域、轮毂顶圆端面等。
[Abstract]:The flow channel submersible sewage pump is widely used in sewage treatment industry because of its excellent characteristics, such as good passing capacity, especially for special occasions where medium particles and impurity fibers are abundant. However, this kind of submersible sewage pump also has wear and winding. Therefore, it is necessary to study a new type of flow channel submersible sewage pump. The method of numerical analysis and experiment is used in this paper. In this paper, the performances of a new type of flow channel submersible sewage pump are studied in detail. The concrete results are as follows: 1) the design idea of the new type of runner impeller is briefly described. The influence of new hydraulic design form on winding performance is explained. On the basis of 3D modeling, the passage capacity of the new flow impeller is compared with that of the traditional impeller with the same power, specific speed and rotational speed. The maximum diameter of the new impeller goes up by 40. The polyhedron mesh of the geometry in the calculation field is divided and the model of calculation is established. The external characteristic test scheme is designed, and the external characteristic test is carried out. Finally, the external characteristic test data of the pump are obtained. The results are compared with the results of numerical calculation, which shows that the flow field in the pump under the condition of clear water is analyzed in detail by using CFD technology to analyze the flow inside the pump. The structure characteristics and evolution process of the flow field in the pump under different operating conditions are compared, the flow law in the pump under the solid-liquid two-phase state is studied in detail, and the different solid concentration and particle size are analyzed and compared. Finally, the distribution of erosion zone on the surface of impeller is predicted. (4) the abrasion test of a new type of runner pump is carried out, and the qualitative analysis and quantitative analysis of the erosion area of impeller are carried out. The distribution of erosion area on impeller surface is summarized, and the distribution of erosion zone in the test is similar to that predicted in the simulation of two-phase flow. Using 3D scanning technology, based on the deviation analysis between point clouds, the erosion results are quantitatively analyzed. The maximum abrasion amount mainly occurs in the inlet edge of the blade and its extension to the working face, the area near the blade outlet edge, the round end face of the hub top, etc.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703.3

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