清污机耙斗和轨道流固负荷时的应力特性研究

发布时间：2018-05-09 20:47

本文选题：耙斗式清污机 + 流体分析　；参考：《昆明理工大学》2017年硕士论文

【摘要】：清污机是一种专门用在水力发电站的取水口前,对水中污物进行清理的水利设备,能够防止污物进入发电机组影响其正常运转,在一定程度上提高了电站的发电效率。目前已广泛应用在水电站或者泵站中,尤其是在中小型的水力发电站中。但是,现在投入使用的清污机大都是在研究人员的经验和静态设计下研制出来的,在使用中出现了各种各样的问题,影响着机组的发电效率,阻碍着水电事业的发展。本文选用耙斗式清污机作为研究对象,结合清污机自身的特点,运用计算流体动力学和流固耦合分析理论,借助计算机辅助分析软件对清污机的结构性能进行分析研究。首先,查阅大量文献资料,找出清污机现存的问题,选择清污机的耙斗和轨道进行研究;然后,根据流体动力学理论,借助FLLUENT软件对清污机工作时的流场数值模拟,得出各种工况下的流场速度、压强以及流体冲击力,并且结合现有理论和实验结果对仿真得出的流体冲击力进行对比,验证这种仿真方法的合理性;最后,根据流固耦合理论,借助ANSYS Workbench软件,对耙斗和轨道两部分进行应力、变形仿真分析,得出水流对它们的影响作用。此外,还对轨道的模态进行了研究分析。通过一系列的仿真分析,得出了耙斗与轨道需要优化之处,并提出了相应的改进方法。本文所采用的仿真方法及分析结果具有一定的代表性,为清污机的研制提供了指导,促进了清污机的发展。
[Abstract]:The decontamination machine is a kind of water conservancy equipment which is specially used to clean up the sewage in the water before the intake of the hydraulic power station. It can prevent the sewage from entering into the generator set and affect its normal operation, and to a certain extent improves the power generation efficiency of the power station. At present, it has been widely used in hydropower stations or pumping stations, especially in small and medium hydropower stations. However, most of the decontamination machines put into use are developed under the experience and static design of researchers. There are a variety of problems in use, which affect the efficiency of generating units and hinder the development of hydropower industry. In this paper, a rake bucket type decontamination machine is chosen as the research object, combining with the characteristics of the decontamination machine itself, the structure performance of the decontamination machine is analyzed by using the theory of computational fluid dynamics and fluid-solid coupling analysis, and the computer aided analysis software is used to study the structure and performance of the decontamination machine. First of all, referring to a large amount of literature to find out the existing problems of the decontamination machine, selecting the rake and track of the decontamination machine for research; then, according to the theory of fluid dynamics, the flow field of the decontamination machine is simulated with the help of FLLUENT software. The flow field velocity, pressure and fluid impact force under various working conditions are obtained, and the simulation results are compared with the existing theories and experimental results to verify the rationality of the simulation method. Finally, according to the fluid-solid coupling theory, the flow field velocity, the pressure and the fluid impact force are obtained. With the help of ANSYS Workbench software, the stress and deformation of rake bucket and track are simulated and analyzed, and the effect of water flow on them is obtained. In addition, the mode of orbit is studied and analyzed. Through a series of simulation analysis, the optimization of rake bucket and track is obtained, and the corresponding improvement method is put forward. The simulation method and analysis results adopted in this paper are representative, which provides guidance for the development of decontamination machine and promotes the development of decontamination machine.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV732.2

【参考文献】