水轮发电机组轴承散热系统流场研究

发布时间：2018-06-26 19:38

本文选题：水轮机 + 轴承　；参考：《华北水利水电大学》2017年硕士论文

【摘要】：随着现代水力发电技术的不断进步,大型与巨型水轮发电机组的应用不断增多,对电网的稳定、安全、可靠运行的影响日益增大,要求机组的运行稳定性必须得到保证。水轮发电机组的轴承系统是保证机组安全稳定运行的重要部件,在实际生产运行过程中,因为机组偏心、轴承散热系统油路循环不合理、润滑油油质劣化等因素引起轴承系统散热不良、造成轴承瓦温过高甚至烧损的现象时有发生,不仅直接影响了轴承的使用寿命,还给电力安全生产带来了严重的威胁。本文就是在查阅大量技术文献与水电站现场调研的基础上,根据实际工程需要,采用现代流场分析Fluent软件对水轮发电机组推力轴承内循环冷却系统内部流场进行研究,分析其速度、压力、温度的分布规律,为机组轴承油循环冷却系统的结构优化设计与安全运行提供技术帮助。主要研究内容如下:1.建立轴承油循环冷却系统中润滑油运动的数学模型,对数值模拟的基本方法以及研究过程中所用的软件进行了介绍,阐述了计算流体力学的求解过程。2.根据某电站水轮发电机推力轴承油循环冷却系统的实际几何尺寸,利用建模软件SolidWorks建立三维几何模型,采用ICEM软件对计算域进行网格划分,并设置相应的边界条件。3.针对不同的瓦温、油温和水温确定的工况,采用Fluent软件计算推力轴承油槽内油的速度、压力和温度分布。4.对不同工况下的计算结果进行对比分析,找出其规律,为推力轴承油循环冷却系统的结构优化和机组的安全稳定运行以及国内其他一些类似水电站的安装检修提供参考。
[Abstract]:With the development of modern hydroelectric power generation technology, the application of large and giant hydroelectric generating units is increasing, and the influence on the stability, safety and reliability of the power grid is increasing day by day, which requires the operation stability of the units to be guaranteed. The bearing system of a hydrogenerator unit is an important part to ensure the safe and stable operation of the unit. In the actual operation process, because of the unit eccentricity, the oil circulation of the bearing heat dissipation system is unreasonable, The poor heat dissipation of bearing system caused by the deterioration of oil quality of lubricating oil causes the phenomenon that the bearing shoe temperature is too high or even burned. It not only directly affects the service life of bearing, but also brings serious threat to the safe production of electric power. On the basis of consulting a large number of technical documents and site investigation of hydropower stations, this paper studies the internal flow field of thrust bearing inner circulation cooling system of hydro-generator units by using fluent software according to the actual engineering needs. The distribution law of speed, pressure and temperature is analyzed, which provides technical help for structural optimization design and safe operation of bearing oil cycle cooling system. The main research contents are as follows: 1. The mathematical model of lubricating oil movement in the circulating cooling system of bearing oil is established. The basic method of numerical simulation and the software used in the research process are introduced, and the solution process of computational fluid mechanics. According to the actual geometry size of thrust bearing oil cycle cooling system of hydrogenerator in a power station, a three-dimensional geometric model is established by using SolidWorks, and the computational domain is meshed with ICEM software, and the corresponding boundary conditions .3are set up. According to the working conditions of different tile temperature, oil temperature and water temperature, the velocity, pressure and temperature distribution of oil in the tank of thrust bearing are calculated by fluent software. The results of calculation under different working conditions are compared and analyzed to find out the law, which provides a reference for the optimization of the structure of thrust bearing oil cycle cooling system and the safe and stable operation of the unit, as well as the installation and maintenance of other similar hydropower stations in China.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV734

【参考文献】