Analysis On The Thermal Coupling And Vibration In The Flow Of Steam Pipeline In Power Plant

Along with the rapid fluid development of industry,vibration problems of fluid-conveying pipes have been occurring.The vibration problem may reduce the service life of pipelines and bearing parts and lead to the leakage,and it may even cause the rupture of pipeline and damage the structure of pipeline supporting.In order to reduce or avoid the negative effects brought by the vibration of the pipeline,the control of the pipeline vibration is really a necessary topic.When the fluid flows in the tube,the flow field changes due to the tube s ystem arrangement or the sudden change of the external environment,which results in the deformation of the solid,then it will in turn affect the flow field.In this paper,the principle of fluid-solid coupling and the research status at home and abroad a re introduced in detail.This paper introduces the principle of solid-liquid coupling and research status at home and abroad in detail.It is great significant to study on solid-liquid coupling in the pipeline system for stabilizing systems operation and enhancing equipment reliability.In this paper,the finite element analysis software is used to simulate the actual working conditions of steam pipes in a power plant,and the vibration characteristics are calculated,analyzed,compared and optimized.Firstly,the first six frequencies of the pipeline are calculated by fluid analysis,static analysis and prestressing mode analysis without support.Second,support the pipe.To avoid resonance,it is necessary to increase the natural frequency of the tube system so that the excitation force does not overlap with the low frequency of the tube system.In this paper,the number,position and width of the pipe bracing are taken as variables to apply the bracing under different parameters,there are 6 kinds of cases.Through calculation and comparison,it can be found that the natural frequency of pipeline increases a lot when three braces are applied in these six cases,which indicates that pipeline bracing plays a key role in improving the natural frequency.Finally,under the condition of fluctuating pressure,rubber was added between the pipe and the support.By comparison and calculation,it can be found that the deformation of the pipeline does not decrease obviously after the addition of rubber.This is because rubber is a high elastomer,it can reduce the vibration,but its elastic modulus is small,when rubber,support and pipe binding contacted,there is no direct support block,pipeline deformation is easier,and deformation is within the acceptable range.However,the maximum equivalent stress of the pipeline is greatly decreased,which can effectively reduce the overall stress distribution of the pipeline,prolong the service life of the pipeline,and prevent fatigue caused by the impact load.