固相参数对泵内流动影响的数值模拟与PIV测试

发布时间：2018-03-10 04:05

本文选题：离心泵　切入点：固液两相流　出处：《浙江理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：固液泵是输送固液混合物的关键设备，在国民生产生活各个领域均有应用，，如矿山行业的矿渣输送，水利方面的清淤灌溉等。但是随着固液泵的广泛应用，它在实际使用过程中存在的缺点和不足也逐渐暴露出来，如过流部件磨损严重及效率偏低等。同时由于两相流动的复杂性，关于这方面的理论研究及设计还不成熟，仍处于探索与发展阶段，流道内部许多固液两相流动规律还没有被揭示出来，在工程实际中多数的设计是建立在经验基础之上，以至于设计出的泵性能得不到保证。因此迫切需要对泵的内部流动进行深入研究，为设计出性能高和运行稳定的泵提供理论基础。粒子图像测速技术（particle imagevelocimetry，PIV）是一种瞬态、多点、无接触式的流体力学测速方法，通过它能够获得平面流场的图像，进而获得平面区域的速度场。目前PIV技术已成为一种有效的速度场测量方法。本文主要对固液两相流泵进行数值模拟与分析，并采用PIV技术对泵内部固液两相流场的分布情况进行测量。通过对泵内部流场的PIV试验测试与数值模拟结果进行对比研究，以期进一步认识固液泵内部流动的流场结构和流动规律，这将有助于改善泵的结构设计，提高泵的性能。本文的主要工作如下： 1）系统阐述了固液两相流泵的研究现状及PIV技术的发展状况。 2）利用UG造型软件进行离心泵实体造型，并使用Gambit进行网格划分，后利用Fluent软件进行清水和固液两相流的数值模拟及结果分析。 3）完善离心泵测试试验台，应用粒子图像测速技术（PIV）对泵在不同工况下的内部流场进行两相流PIV测试试验，并分析流场内固相颗粒的速度变化规律和运动特性。 4）将数值模拟结果与PIV试验结果进行综合对比分析，从而互相验证了数值方法和试验方法的可靠性，取得了有参考意义的试验数据和结果，为后续的固液泵的进一步研究积累了基础。
[Abstract]:Solid-liquid pump is the key equipment for conveying solid-liquid mixture. It has been used in various fields of national production and life, such as slag transportation in mining industry, desilting irrigation in water conservancy and so on. But with the wide application of solid-liquid pump, The shortcomings and shortcomings in the process of practical application have been gradually exposed, such as serious wear of overcurrent parts and low efficiency, etc. At the same time, due to the complexity of two-phase flow, the theoretical research and design of this aspect are not mature. Still in the stage of exploration and development, many solid-liquid two-phase flow patterns in the channel have not been revealed. In engineering practice, most of the designs are based on experience. Therefore, it is urgent to study the internal flow of the pump in order to provide a theoretical basis for designing a pump with high performance and stable operation. Particle image velocimetric PIV is a transient and multipoint technique. The contactless hydrodynamic velocimetry method can obtain the image of the plane flow field and then obtain the velocity field in the plane region. At present, the PIV technique has become an effective method for measuring the velocity field. In this paper, the numerical simulation and analysis of the solid-liquid two-phase flow pump are carried out, and the distribution of the solid-liquid two-phase flow field in the pump is measured by PIV technique. The results of PIV test and numerical simulation of the flow field inside the pump are compared and studied. In order to further understand the flow field structure and flow law of the solid liquid pump, this will help to improve the pump structure design and improve the pump performance. The main work of this paper is as follows:. 1) the research status of solid-liquid two-phase flow pump and the development of PIV technology are systematically described. 2) the solid modeling of centrifugal pump is carried out by UG software, the mesh is divided by Gambit, and the numerical simulation and result analysis of clean water and solid-liquid two-phase flow are carried out by using Fluent software. 3) improve the test rig of centrifugal pump, using particle image velocimetry (PIV) to test the internal flow field of the pump under different working conditions by PIV, and analyze the velocity variation law and motion characteristics of solid particles in the flow field. 4) the numerical simulation results are compared with the PIV test results, and the reliability of the numerical method and the test method are verified, and the reference data and results are obtained. It provides a basis for further study of solid-liquid pumps.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

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