输流管道动力学分析及减振研究
发布时间：2018-12-12 11:35
【摘要】：管道作为重要的介质传输元件,在化工、电力、石油等行业有着极其重要的应用,但是管道振动问题已经严重制约了装备的大型化发展、降低装备运行的可靠性,甚至还会造成严重事故,因此对输流管道进行动力学特性分析和减振研究显得极为重要。本文结合河南某电厂再热热段蒸汽管道的振动问题对输流管道进行动力学特性研究并提出减振建议。本文通过对输流管道进行动力学分析和减振研究,分别从固体侧和流体侧对影响管道振动的因素进行分析,并对管道进行瞬态动力学分析,研究其在非稳态流动下管道结构的动力学响应,同时利用专业管道分析软件对电厂再热热段蒸汽管道进行分析。首先本文以ANSYS Workbench为平台着重研究管道壁厚、约束位置、管道内径、位移约束等对管道固有频率的影响,同时考虑流固耦合对管道固有频率的影响,并且对不同约束条件下的弯管进行瞬态动力学分析。其次以Fluent软件为分析平台,在ANSYS ICEM中对一半的管系进行建模并进行结构网格划分,分别对稳态和非稳态流动下流体的运动特性进行分析。结论认为管道壁厚、管道内径和位移约束对管道的固有频率有较大的影响;约束位置对管道的动力学特性影响较大;由于管内流体是过热蒸汽,所以考虑流固耦合和不计流固耦合对管道的固有频率影响不大;在对流体进行流场分析过程中发现在弯头处出现对旋的二次流动。接着利用管道分析软件CAESARⅡ对整个管系进行静力学和动力学分析,并结合上述的结论,给管系增加阻尼和位移约束,发现增加阻尼对管道的一次应力、二次应力和管道的固有频率都会产生增大的影响,增加阻尼和位移约束会使管道的一次应力和固有频率增大,管道的二次应力降低,管道节点的最大位移明显减小,从原来的257.246mm减小到23.417mm,随着位移约束的增大,一次应力略微增大,二次应力明显降低,固有频率不变。最后给出了此再热热段蒸汽管道的减振意见。本文通过对输流管道进行动力学特性分析,提出减振方案建议,对减小管道系统二次应力、提高管道的固有频率、降低操作工况下管道系统的最大位移有明显的效果。
[Abstract]:As an important medium transmission element, pipeline has very important applications in chemical industry, electric power, petroleum and other industries. However, pipeline vibration has seriously restricted the large-scale development of equipment and reduced the reliability of equipment operation. Even serious accidents can be caused, so it is very important to analyze the dynamic characteristics and reduce vibration of the pipeline. Based on the vibration of steam pipeline in reheat section of a power plant in Henan Province, this paper studies the dynamic characteristics of the pipeline and puts forward some suggestions for vibration reduction. In this paper, the dynamic analysis and vibration absorption analysis of the pipeline are carried out, and the factors affecting the pipeline vibration are analyzed from the solid side and the fluid side, respectively, and the transient dynamic analysis of the pipeline is carried out. The dynamic response of pipeline structure under unsteady flow is studied, and the steam pipeline in reheat section of power plant is analyzed by professional pipeline analysis software. Firstly, based on ANSYS Workbench platform, the influence of pipe wall thickness, constrained position, pipeline inner diameter and displacement constraint on the natural frequency of pipeline is studied, and the influence of fluid-solid coupling on the natural frequency of pipeline is considered at the same time. At the same time, the transient dynamic analysis of the bends under different constraint conditions is carried out. Secondly, using Fluent software as the analysis platform, half of the pipe system is modeled in ANSYS ICEM and the structural meshes are divided to analyze the motion characteristics of the fluid under steady and unsteady flow respectively. It is concluded that the thickness of the pipe wall, the inner diameter and the displacement constraint have great influence on the natural frequency of the pipeline, and the constrained position has a great influence on the dynamic characteristics of the pipeline. Because the fluid in the pipe is superheated steam, the fluid-solid coupling and non-fluid-solid coupling have little effect on the natural frequency of the pipeline. During the flow field analysis of the fluid, it is found that there is a counter-rotating secondary flow at the elbow. Then the static and dynamic analysis of the whole pipe system is carried out by using the pipeline analysis software CAESAR 鈪，
本文编号：2374486
[Abstract]:As an important medium transmission element, pipeline has very important applications in chemical industry, electric power, petroleum and other industries. However, pipeline vibration has seriously restricted the large-scale development of equipment and reduced the reliability of equipment operation. Even serious accidents can be caused, so it is very important to analyze the dynamic characteristics and reduce vibration of the pipeline. Based on the vibration of steam pipeline in reheat section of a power plant in Henan Province, this paper studies the dynamic characteristics of the pipeline and puts forward some suggestions for vibration reduction. In this paper, the dynamic analysis and vibration absorption analysis of the pipeline are carried out, and the factors affecting the pipeline vibration are analyzed from the solid side and the fluid side, respectively, and the transient dynamic analysis of the pipeline is carried out. The dynamic response of pipeline structure under unsteady flow is studied, and the steam pipeline in reheat section of power plant is analyzed by professional pipeline analysis software. Firstly, based on ANSYS Workbench platform, the influence of pipe wall thickness, constrained position, pipeline inner diameter and displacement constraint on the natural frequency of pipeline is studied, and the influence of fluid-solid coupling on the natural frequency of pipeline is considered at the same time. At the same time, the transient dynamic analysis of the bends under different constraint conditions is carried out. Secondly, using Fluent software as the analysis platform, half of the pipe system is modeled in ANSYS ICEM and the structural meshes are divided to analyze the motion characteristics of the fluid under steady and unsteady flow respectively. It is concluded that the thickness of the pipe wall, the inner diameter and the displacement constraint have great influence on the natural frequency of the pipeline, and the constrained position has a great influence on the dynamic characteristics of the pipeline. Because the fluid in the pipe is superheated steam, the fluid-solid coupling and non-fluid-solid coupling have little effect on the natural frequency of the pipeline. During the flow field analysis of the fluid, it is found that there is a counter-rotating secondary flow at the elbow. Then the static and dynamic analysis of the whole pipe system is carried out by using the pipeline analysis software CAESAR 鈪，
本文编号：2374486
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