气力输送喷射器的设计计算及数值模拟

发布时间：2018-04-30 08:29

本文选题：气力输送系统 + 喷射器　；参考：《安徽理工大学》2017年硕士论文

【摘要】：气力输送装置具有不直接消耗机械能而实现增压过程,输送过程相对传统机械输送具有安全、结构简单、易于自动化过程、对环境污染少,可以使固体颗粒沿着输送管道实现一到多地的输送和多地向一地的聚集等优点。现已广泛运用在矿产、电力、水泥、粮食、铸造、建材等领域中。喷射器是气力输送系统的关键装置,其结构和性能都必受到人们越来越多的关注。从喷射器工作原理出发,对设计所涉及到的理论计算公式进行了归纳。由实际设计要求,采用最优化结构设计法,对喷射器的主要尺寸进行了设计。气力输送系统涉及到两相流动,由于两相流动的复杂性,对于气力输送相关的设计计算大部分采用理论和实验相结合的方法。本文利用FLUENT软件,采用双欧拉模型和离散模型对其内部流动进行了数值模拟。首先利用三维建模工具对喷射器模型建立,再通过网格划分软件对其进行网格划分,最后在FLUENT软件中完成对喷射器的数值模拟。通过数值模拟验证所设计结构的准确性,并对其内部的流动特性进行了分析。考虑了结构参数改变对气力输送喷射器的影响,得到了静压变化曲线,固体颗粒速度矢量图、气体湍流动能图和速度云图等。分析了不同结构参数对气力输送系统的性能影响,并对气力输送相关的输送管道的颗粒悬浮理论做了验证。所运用的设计理论过程和数值模拟过程,对喷射器在工程上的应用有一定的指导作用。
[Abstract]:Pneumatic conveying device has the advantages of realizing pressurized process without directly consuming mechanical energy. Compared with traditional mechanical transportation, the conveying process is safe, simple in structure, easy to automate process, and less pollution to the environment. The solid particles can be transported one to many places along the conveying pipeline and aggregating from one place to one place. Has been widely used in minerals, electricity, cement, grain, casting, building materials and other fields. Ejector is the key device of pneumatic conveying system, its structure and performance will be paid more and more attention. Based on the working principle of the ejector, the theoretical calculation formulas involved in the design are summarized. According to the actual design requirements, the main dimensions of the ejector are designed by the method of optimum structure design. Pneumatic conveying system involves two-phase flow. Due to the complexity of two-phase flow, most of the design and calculation of pneumatic conveying are based on the combination of theory and experiment. In this paper, FLUENT software is used to simulate the internal flow with double Euler model and discrete model. Firstly, the ejector model is built by using 3D modeling tools, then the ejector model is meshed by the meshing software. Finally, the numerical simulation of the ejector is completed in FLUENT software. The accuracy of the designed structure is verified by numerical simulation, and its internal flow characteristics are analyzed. Considering the influence of the structural parameters on the pneumatic conveying injector, the static pressure variation curve, the velocity vector diagram of solid particles, the kinetic energy map of gas turbulence and the velocity cloud diagram are obtained. The influence of different structural parameters on the performance of pneumatic conveying system is analyzed, and the particle suspension theory of pneumatic conveying pipeline is verified. The design theory process and numerical simulation process are used to guide the application of ejector in engineering.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH232

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