固液两相流离心泵内部流动特征的数值计算

发布时间：2018-05-26 09:38

本文选题：离心泵 + 固液两相流　；参考：《浙江理工大学》2014年硕士论文

【摘要】：固液两相流离心泵是输送固液混合物的重要设备之一，广泛应用于生产生活的各个领域当中，比如城市供水，，石油化工输送，水利清淤以及农业灌溉等方面。然而随着固液泵的广泛应用，在实际工程应用过程中存在许多不足：过流部件磨损严重、偏离设计工况运行导致能耗过大以及效率偏低等。考虑到两相流动的复杂性，两相流的理论研究以及水力机械设计还有很大的提升空间，流道内很多固液两相流动的规律还有待深入系统的研究。工程实际中的大部分设计是依靠经验，因此不能很好地保证设计出的泵的水力性能。所以，基于数值模拟的方法对泵的内部流动进行深入研究非常有意义，可为设计出工作性能高、运行稳定并且能耗低的固液泵提供理论参考。本文通过实验与数值计算相结合的方法，以期进一步认识固液泵内部流动的规律以及固相参数对离心泵内部流场和外特性的影响，这将有助于对泵进行优化设计，提高其性能。本文的主要内容： 1使用Pro/E对离心泵叶轮和蜗壳流道进行三维建模，利用Gambit对三维模型进行网格划分，最后利用Fluent进行离心泵多工况清水数值计算，分析得出不同工况下泵内部流场分布情况，并且与多工况清水实验结果进行对比。 2计算离心泵固液两相定常流动，从固相颗粒本身性质出发研究固相颗粒运动及离心泵内部流体流动的规律以及内部磨损机理，并且定性分析这些因素对泵外特性的影响。 3计算离心泵固液两相非定常流动，获得不同时刻泵内部流场分布以及固体颗粒运动及其对离心泵过流部件磨损的规律，分析不同时刻泵外特性的变化。
[Abstract]:Solid liquid two phase flow centrifugal pump is one of the important equipment for transporting solid and liquid mixtures. It is widely used in various fields of production and life, such as urban water supply, petrochemical transportation, water conservancy silting and agricultural irrigation. However, with the wide application of solid-liquid pump, there are many shortcomings in the practical application process: overcurrent components. In view of the complexity of the two phase flow, the theoretical study of two phase flow and the design of hydraulic machinery still have a lot of room to improve. Many laws of solid-liquid two phase flow in the flow channel are still to be studied in depth. Most of the design in engineering practice is based on the design of the engineering practice. Depending on experience, the hydraulic performance of the designed pump can not be guaranteed very well. Therefore, it is of great significance to study the internal flow of the pump based on the numerical simulation method. It can provide a theoretical reference for the design of a solid liquid pump with high performance, stable operation and low energy consumption.
In this paper, a combination of experiments and numerical calculations is used to further understand the law of the internal flow of the solid liquid pump and the effect of the solid state parameters on the flow field and external characteristics of the centrifugal pump. This will help to optimize the design of the pump and improve its performance.
The main contents of this article are as follows:
1? Using Pro/E to model the three-dimensional model of centrifugal pump impeller and volute channel, using Gambit to mesh the three-dimensional model, and finally using Fluent to calculate the water flow of the centrifugal pump in multiple working conditions. The distribution of the internal flow field in the pump under different working conditions is analyzed and compared with the results of the water experiment in multiple working conditions.
2? Calculation of solid-liquid two-phase constant flow in centrifugal pump. The law of solid particle motion and internal fluid flow in centrifugal pump and internal wear mechanism are studied from the properties of solid particles, and the effects of these factors on the pump characteristics are qualitatively analyzed.
3? Calculating the unsteady flow of solid-liquid two phase flow in a centrifugal pump, obtaining the distribution of the flow field inside the pump at different time, the movement of solid particles and the wear of the over current parts of the centrifugal pump, and analyzing the changes of the external characteristics of the pump at different times.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH311

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