高速离心式压缩机转子动力学有限元分析

发布时间：2018-03-22 06:29

本文选题：离心压缩机　切入点：叶轮　出处：《华中科技大学》2012年硕士论文　论文类型：学位论文

【摘要】：离心压缩机被广泛应用于石油、化工和冶金等各个领域。作为衡量一个国家重大装备制造业发展水平的标志性设备之一的大型离心压缩机技术含量高，开发、制造难度大。压缩机的叶轮是它的核心部件，转子组系统的运转的安全性对于整个机组的可靠性有着至关重要的影响。因此，对离心压缩机叶轮的强度应力分析和转子组的动态分析，是高速离心压缩机设计中必须解决的关键技术问题。本文针对某大型国产离心压缩机叶轮进行研究，利用Solidworks进行建模，然后用有限元分析模块对叶轮进行数值计算。结果表明产品的最大应力值在叶轮出口的叶片和轮盘的交接处。通过修改轮盘的厚度来优化设计叶轮。计算结果表明，在保证叶轮足够强度的情况下，通过优化轮盘的厚度能降低叶轮的最大应力值，这为叶轮结构设计提供了设计准则。对某大型国产双级双吸压缩机中的转子组进行动态分析，发现通过修改轴径和叶轮的重量两个参数可以避免转子的共振现象。其中叶轮的重量是通过修改轮盖的厚度来实现的。研究结果为如何避免发生共振现象提供了理论基础，并为转子组的设计提供了设计准则。本文的研究成果，，不仅对降低离心压缩机叶轮的最大应力值具有一定的指导意义，而且对优化设计转子组也有着一定的参考价值。
[Abstract]:Centrifugal compressors are widely used in petroleum, chemical, metallurgical and other fields. As one of the landmark equipments to measure the development level of major equipment manufacturing industry in a country, large centrifugal compressors have high technical content and development. The impeller of the compressor is its core component, and the safety of the rotor group system has a vital effect on the reliability of the whole unit. The strength stress analysis of centrifugal compressor impeller and the dynamic analysis of rotor group are the key technical problems that must be solved in the design of high speed centrifugal compressor. In this paper, the impeller of a large scale centrifugal compressor is studied, and the model is built by Solidworks. Then the finite element analysis module is used to calculate the impeller numerically. The results show that the maximum stress value of the product is at the junction of the blade and the disk at the outlet of the impeller. The impeller is optimized by modifying the thickness of the wheel. The maximum stress value of impeller can be reduced by optimizing the thickness of impeller under the condition of guaranteeing the sufficient strength of impeller, which provides the design criterion for impeller structure design. The dynamic analysis of rotor group in a large domestic double stage double suction compressor is carried out. It is found that the rotor resonance can be avoided by modifying the axial diameter and the weight of the impeller, in which the weight of the impeller is realized by modifying the thickness of the cover. The results provide a theoretical basis for how to avoid the resonance phenomenon. It also provides the design criterion for the rotor group design. The research results of this paper not only have certain guiding significance to reduce the maximum stress value of centrifugal compressor impeller, but also have certain reference value to the optimization design of rotor group.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH452

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