离心泵内部流动PIV测试研究与三维数值模拟

发布时间：2018-01-28 02:42

本文关键词： 离心泵三维PIV 数值模拟内部流场　出处：《浙江理工大学》2011年硕士论文　论文类型：学位论文

【摘要】：近年来,粒子图像测速技术(PIV,Particle Image Velocimetry)发展比较迅速,该技术应用范围比较广泛,已成为研究复杂流场的一种有效测试手段。虽然很多学者在离心泵内部流动方面研究比较多,对离心泵内部的流动结构和流动规律也有了一些认识,但由于离心泵内部流动比较复杂,许多流动现象的流场结构和产生机理仍不是太清楚,因此还需做大量相关的研究工作。为了揭示离心泵内部流动的规律,及其外特性规律,本文采用数值模拟与试验研究相结合的方法,研究离心泵内部流动规律,为离心泵的设计和改进提供了一定的理论依据。本文的主要工作如下: (1)系统概述了国内外学者在离心泵方面的研究成果及现状。 (2)利用Pro/E三维造型软件进行叶轮、蜗壳实体造型,并在Gambit软件中进行网格划分后,导入Fluent软件进行泵内流动数值模拟,并对结果进行了分析。 (3)搭建了一套同时满足水泵外特性试验和PIV测试要求的试验台,并在转速为2900r/min工况下,进行水泵的外特性试验,得到了水泵的性能曲线,与数值模拟预测结果进行对比,两者在总体上基本吻合。 (4)利用PIV技术,分别在0.4、1.0和1.2倍设计流量的工况下,对离心泵叶轮内部流场进行试验研究。测试窗口分别取在三个不同的叶槽中,在每个叶槽中选取两个断面(中截面和距离前盖板为5mm的截面)。在测得叶轮内部的绝对速度矢量后,按照速度三角形原理对绝对速度进行分解,从而得到了相对速度分量,对其进行分析,揭示了叶轮内部流场的分布规律。根据试验结果可知,采用三维PIV技术对离心泵内部的流场进行研究是可行的,能够反映离心泵内部实际情况的三维流场,其研究成果可为离心泵设计提供重要的参考。
[Abstract]:In recent years, particle Image velocimetry (PIV) has developed rapidly and has been widely used. It has become an effective method to study complex flow field. Although many scholars have more research on the flow inside the centrifugal pump and have some understanding of the flow structure and the flow law inside the centrifugal pump, but the flow inside the centrifugal pump is more complex. The flow field structure and generation mechanism of many flow phenomena are still not clear, so a lot of related research work is needed. In order to reveal the internal flow law of centrifugal pump and its external characteristics. In this paper, the method of numerical simulation and experimental study is used to study the internal flow law of centrifugal pump, which provides a certain theoretical basis for the design and improvement of centrifugal pump. The main work of this paper is as follows: 1) the research results and present situation of centrifugal pump are summarized systematically at home and abroad. (2) the impeller and volute are modeled with Pro/E 3D modeling software, and the flow in pump is simulated with Fluent software after meshing in Gambit software. The results are analyzed. At the same time, a set of test bench was built to meet the requirements of pump external characteristic test and PIV test, and the external characteristic test of pump was carried out under the condition of 2900r / min rotational speed. The performance curves of the pump are obtained and compared with the numerical simulation results, which are in good agreement with each other. The flow field of centrifugal pump impeller is studied by using PIV technology under the conditions of 0.4U 1.0 and 1.2 times design flow rate, respectively. The test window is taken in three different vane slots. Two sections (the middle section and the section with 5 mm distance from the front cover) were selected in each blade slot. After the absolute velocity vector was measured, the absolute velocity was decomposed according to the principle of velocity triangle. The relative velocity component is obtained, and the distribution law of the flow field in the impeller is revealed. According to the experimental results, it is feasible to study the flow field in the centrifugal pump by using three-dimensional PIV technology. The three-dimensional flow field can reflect the actual situation of centrifugal pump, and the research results can provide an important reference for the design of centrifugal pump.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311

【引证文献】