活塞式液体灌装试验系统的流场分析与研究

发布时间：2018-03-06 21:04

本文选题：ICEM　切入点：CFD　出处：《武汉理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：包装行业是与人类生活紧密相关的行业，人们对液体相关的食品、饮品、药品等消耗量越来越大，这对包装行业的发展起到促进作用，由此可见人们高品质的生活离不开先进的包装设备，本论文的研究对象灌装设备就是包装设备中的一种。国内灌装设备研发能力不足、灌装流体理论研究不够全面是制约灌装技术发展的重要因素，鉴于现状，笔者便对自主研发制造的灌装试验设备进行流场分析，并且结合灌装试验，得到流体在灌装设备中的运动规律，这些规律的研究对包装行业的发展有一定价值。为更全面研究流体的运动规律，本论文采取的研究方法是将试验分析与数值分析相结合。试验分析采取正交试验的方法，数值分析试验主要是进行多组的数值分析，数值分析的过程是先建立模型，转换格式之后导入到ICEM CFD中，并对模型进行结构性的网格划分，，以保证较高的计算精度，最后导入到fluent之中完成求解。目前，运用此种方法对灌装试验设备进行研究尚不多见。本文研究内容主要分为以下三个部分：第一部分：对灌装管道的变径结构进行数值分析试验，灌装管道共有五种变径结构，设定两种流体并且具有三种不同的流体速度，探讨流体在不同变径结构的管道中的运动状态，找出流体的运动规律，有助于设计合理的变径结构。第二部分：首先设计正交试验表，对灌装设备进行灌装试验，找到影响灌装效果的因素的主次；然后对不同形状的灌装喷嘴进行数值分析试验，得到不同流体在不同条件下在不同喷嘴中的运动状态，结合灌装试验与数值模拟试验，找到各个因素影响灌装效果的机理，有助于设计喷嘴的形状。第三部分：对活塞泵运行过程进行流场分析，若按照活塞泵的真实运动情况进行数值分析，难度非常大，为了顺利完成对活塞泵的流场分析，将活塞泵的运动过程简化为活塞运动和阀芯运动，然后分别对活塞运动和阀芯运动进行流场分析，得到流体在其内部的运动状态，找出流体运动规律，有助于优化泵体及阀芯的结构。本论文创新的提出运用后处理结果中的压力、湍动能以及气相体积率三项指标来衡量流体在管道中的流动状态，然后运用matlab对大量的试验数据进行处理与分析，最终得到影响灌装效果因素的主次，管道变径结构的设计方法，灌装喷嘴形状的设计方法以及流体在活塞泵运行过程中的流动状态，对于设计更为优良的活塞泵提供了理论依据。
[Abstract]:Packaging industry is closely related to human life. People consume more and more liquid related food, drink, medicine and so on, which plays a role in promoting the development of packaging industry. This shows that people can not live without advanced packaging equipment, the research object of this paper filling equipment is one of the packaging equipment. Domestic filling equipment R & D capacity is insufficient, The theoretical study of filling fluid is an important factor restricting the development of filling technology. In view of the present situation, the author analyzes the flow field of the self-developed filling test equipment, and combines with the filling test. The laws of fluid movement in filling equipment are obtained, and the research of these laws is of value to the development of packaging industry. In order to study the motion law of fluid more comprehensively, the research method adopted in this paper is to combine the experimental analysis with the numerical analysis. The experimental analysis adopts the method of orthogonal test, and the numerical analysis experiment mainly carries on the multi-group numerical analysis. The process of numerical analysis is to establish the model, convert the format and import it into ICEM CFD, and divide the model into structural meshes to ensure higher calculation accuracy. Finally, the model is imported into fluent to complete the solution. It is rare to study the filling test equipment by this method. The content of this paper is divided into the following three parts:. The first part: the numerical analysis and test of the variable diameter structure of the filling pipeline. There are five kinds of variable diameter structure in the filling pipeline, two kinds of fluid are set and there are three different fluid velocities. It is helpful to design a reasonable variable diameter structure by discussing the moving state of fluid in the pipeline with different diameters and finding out the motion law of the fluid. The second part: first, the orthogonal test table is designed, and the filling test of filling equipment is carried out to find out the main and secondary factors that affect the filling effect, and then the numerical analysis test is carried out on different shape filling nozzles. The moving states of different fluids in different nozzles under different conditions are obtained. Combined with the filling test and numerical simulation test, the mechanism of various factors affecting the filling effect is found, which is helpful to design the shape of the nozzle. The third part: the flow field analysis of piston pump operation process, if according to the real piston pump motion analysis, it is very difficult, in order to successfully complete the piston pump flow field analysis, The motion process of piston pump is simplified as piston motion and valve core motion. Then the flow field of piston motion and valve core motion are analyzed, and the movement state of fluid inside is obtained, and the fluid motion law is found out. It helps to optimize the structure of pump body and valve core. In this paper, three indexes of pressure, turbulent kinetic energy and gas phase volume ratio in the post-processing results are proposed to measure the flow state of the fluid in the pipeline, and then a large number of experimental data are processed and analyzed by matlab. Finally, the main and secondary factors affecting the filling effect, the design method of pipeline variable diameter structure, the design method of filling nozzle shape and the flow state of fluid in the operation of piston pump are obtained. It provides a theoretical basis for the better design of piston pump.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB487

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