油气润滑系统水平管内环状流形成机理研究

发布时间：2018-06-13 09:21

本文选题：油气润滑 + 环状流　；参考：《燕山大学》2011年硕士论文

【摘要】：随着现代化工业生产水平的不断提高,对机械工业的要求也越来越高,当前机械产品正朝着高速、重载、高效、节能、自动化程度高和使用寿命长的方向发展,对润滑效果的要求也越来越高。油气润滑就是适应新时期发展需求而开发的新型润滑方式,它综合了气液两种流体润滑的特点,起到了冷却与润滑的双重作用,能够实现连续、定量、缓慢、均匀地向润滑点供油,可以最大限度地提高被润滑元件的使用寿命。同时,油气润滑还具有润滑介质消耗量极低、对环境污染小和自动化程度高等优点,已应用于多个工业领域,并取得了良好的经济效益。环状流是符合油气润滑工况下,油气输送管道内两相流的流型。国内目前油气润滑技术水平较低的主要原因就是对环状流形成机理的认识还不够深刻。因此,本课题以开发具有自主知识产权的油气润滑系统及关键零部件为目的,进行了以下几个方面的研究: (1)基于流体力学的基本方程,结合环状流的流动特点,建立其数学模型;并给出了环状流动时的压降、液膜厚度和截面含气率的计算方法。 (2)通过高速摄影法获取油气混合器和流型观察段内气液两相瞬时分布图片,据此判断不同气液流量时管内流型,得出了流型的转换规律;重点分析环状流时气液两相的相互作用,提出了新的环状流形成机理。 (3)利用流体仿真软件FLUENT对油气混合器内流场进行数值模拟,研究气液两相的流动特性和判断流型,并与Mandhane流型图作对比;分析不同气液流量时的两相体积分数分布图及压力、速度分布情况,丰富、完善由实验结果得出的环状流形成机理。
[Abstract]:With the continuous improvement of the level of modern industrial production, the requirements for the machinery industry are becoming higher and higher. The current mechanical products are developing towards high speed, heavy load, high efficiency, energy saving, high automation and long service life, and the requirements for the lubrication effect are becoming higher and higher. Oil and gas lubrication is a new type of development to adapt to the development of the new period. The lubrication method, which combines the characteristics of two kinds of fluid lubrication, plays the dual role of cooling and lubrication, can achieve continuous, quantitative, slow, uniform supply of oil to the lubricating point, and can maximize the service life of the lubricating element. At the same time, the oil and gas lubrication also has low lubricating medium consumption and low pollution and self pollution to the environment. The advantages of high degree of automation have been applied to many industrial fields and good economic benefits have been achieved.
The annular flow is the flow pattern of the two-phase flow in the oil and gas pipeline under the condition of oil and gas lubrication. The main reason for the low oil and gas lubrication technology at home is that the understanding of the forming mechanism of the annular flow is not deep enough. Therefore, the purpose of this project is to develop the oil and gas lubrication system and key components with independent intellectual property. The following aspects of the study:
(1) based on the basic equations of fluid mechanics and combining the flow characteristics of the annular flow, the mathematical model is established, and the calculation method of pressure drop, the thickness of the liquid film and the gas content of the cross section in the annular flow is given.
(2) the instantaneous distribution picture of gas and liquid two phase in the oil gas mixer and the flow pattern observation section is obtained by high speed photography. According to this, the flow pattern in the tube is judged by the different gas and liquid flow, and the transformation law of the flow pattern is obtained. The interaction of the gas-liquid two phases in the annular flow is emphatically analyzed, and the new forming mechanism of the annular flow is put forward.
(3) use the fluid simulation software FLUENT to simulate the flow field in the oil and gas mixer, study the flow characteristics of the gas-liquid two phase and determine the flow pattern, and compare with the Mandhane flow pattern, analyze the two phase volume fraction distribution diagram and pressure, the velocity distribution situation in different gas and liquid flow, and enrich the annular flow formation from the experimental results. Mechanism.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH117.2

【引证文献】