液气射流泵数学模型建立及其数值模拟研究

发布时间：2018-05-08 00:02

本文选题：液气射流泵 + 欧拉双流体模型　；参考：《大连交通大学》2012年硕士论文

【摘要】：概述了国内外液气射流泵的研究背景与发展现状，利用液气射流泵取代蒸汽喷射式制冷系统中的辅助喷射器与冷凝器，细致地分析了液气射流泵系统的基本工作原理及其在蒸汽喷射式制冷系统中应用的可行性。液气射流泵具有结构简单、安装方便、运行节能、可靠性高、故障率低等优点，在对整体设计方案分析和计算的基础上，利用VB和Access数据库编制了液气射流泵的结构尺寸计算程序。传统的以实验为基础的研究需要花费大量的人力、物力及财力，并且研究周期过长。相比之下，数值模拟作为一种可靠的研究途径，具有时间短、成本低及见效快等优点，，已在各行业中得到广泛的应用；目前对液气射流泵的两相流体混合进行二维仿真的比较多，而采用三维数值模拟的还比较少，本文采用空气动力学仿真软件FLUENT对该系统的核心部件液气射流泵的内部流体混合过程进行三维数值模拟。首先采用绘图软件Pro/E构建液气射流泵的三维物理模型，然后将Pro/E软件生成的物理模型导入FLUENT前处理软件GAMBIT中进行网格划分并设定流动计算所需的各种边界条件，采用欧拉双流体模型对液气射流泵的混合过程进行仿真，通过对数值计算结果进行分析后，发现本文所设计的液气射流泵抽真空的能力可以满足冷凝器的真空度要求。最后应用FLUENT软件对液气射流泵内部两相流体流动混合过程进行仿真分析，通过对不同结构尺寸（面积比、喉嘴距、长径比）下的液气射流泵性能进行分析比较，确定了液气射流泵面积比、喉嘴距和长径比的最优范围，为液气射流泵的设计提供了一种可行的新方法。
[Abstract]:The research background and development status of liquid-gas jet pump at home and abroad are summarized. The auxiliary ejector and condenser in steam jet refrigeration system are replaced by liquid-gas jet pump. The basic working principle of the liquid-air jet pump system and the feasibility of its application in the steam jet refrigeration system are analyzed in detail. The liquid-air jet pump has the advantages of simple structure, convenient installation, energy-saving operation, high reliability, low failure rate, etc. On the basis of the analysis and calculation of the overall design scheme, Using VB and Access database, the calculation program of the structure dimension of the liquid-air jet pump is compiled. Traditional experimental-based research takes a lot of manpower, material and financial resources, and the research cycle is too long. In contrast, numerical simulation, as a reliable research approach, has the advantages of short time, low cost and quick effect, and has been widely used in various industries. At present, there are many two-dimensional simulations of two-phase fluid mixing in liquid-air jet pumps, but few use three-dimensional numerical simulation. In this paper, the aerodynamics simulation software FLUENT is used to simulate the internal fluid mixing process of the liquid-gas jet pump, which is the core of the system. Firstly, the three-dimensional physical model of liquid-gas jet pump is constructed by using Pro/E software, then the physical model generated by Pro/E software is imported into FLUENT pre-processing software GAMBIT for grid division and various boundary conditions for flow calculation are set up. Eulerian two-fluid model is used to simulate the mixing process of liquid-gas jet pump. Through the analysis of the numerical results, it is found that the vacuum capacity of the liquid-gas jet pump designed in this paper can meet the vacuum requirement of the condenser. Finally, FLUENT software is used to simulate and analyze the mixing process of two-phase fluid flow in the liquid-gas jet pump, and the performance of the liquid-gas jet pump under different structure dimensions (area ratio, throat distance, length to diameter ratio) is analyzed and compared. The optimum range of the area ratio, throat distance and aspect ratio of the liquid-gas jet pump is determined, which provides a new feasible method for the design of the liquid-gas jet pump.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH38

【引证文献】