【作者】 裴正武；

【导师】 何立东；

【作者基本信息】 北京化工大学 ， 机械工程， 2012， 硕士

【摘要】 在石油化工领域中，管道系统的振动已经成为一种很普遍的现象。它对企业的安全生产造成了很大的威胁，也是很多火灾和爆炸事故的直接原因。在转子密封系统中，转子的偏心所导致的流体激振现象日益成为高速旋转机械的重大安全隐患，全世界每年因流体激振所损坏的机械也不计其数。针对这两大人们备受关注的问题，本文主要了以下工作：（1）结合实际工程案例分析和总结了管道以及管道附件振动的常见原因，运用FLUENT流体计算软件对管道弯头内流场进行模拟，分析出影响弯头冲击力的因素，为管道减振提供了理论依据。（2）主要以两个管道减振实际工程案例讲述了如何根据实际情况来对管道进行有效减振，结合实际分析了新型液体粘滞阻尼器的减振原理及其优点。（3）分析了流体激振产生的根本机理，并运用FLUENT流体计算软件对转子偏心时光滑密封间隙流场进行模拟，分析出转子偏心时密封间隙的流场特征，通过控制变量法分析出影响流体激振里的主要因素。（4）运用FLUENT软件对转子偏心时蜂窝密封间隙流场进行数值模拟，分析流场特性，并将蜂窝密封和光滑密封所产生的流体激振力进行对比，证明了蜂窝密封可以有效减小转子密封系统的流体激振力。更多还原

【Abstract】 In the field of petroleum and chemical, vibration of pipe-system hasbecome a very common phenomenon. It makes a significant threaten to safetyand production of enterprise and it is also the direct cause of a lot of fire andexplosion accidents. In rotor and seal system, the fluid excitation caused byeccentricity of rotor is becoming a major threaten for high-speed rotatingmachinery, and countless machines break due to the fluid excitation each yearall over the world. In the aim of solving these two problems, the flowingworks have been done in this paper:(1) Analysis and summary on the common reason why pipe-systemvibrates have been made. Flow field in pipe elbow was simulated withsoftware of Fluent, and factors effecting impaction of elbow were figured out,which provided theoretical basis for damping of pipe-system.(2) An example was made with two real projects, it investigated how tocontrol vibration of pipe according to actual situation, represented theprinciple and the installation method of new viscous damper, which provided practical basis for damping of pipe-system.(3) The basic principle of fluid induced vibration was analyzed and lotsof simulations of flow field characteristic in seal clearance were made withsoftware of Fluent when rotor produces an eccentric quantity. The mainfactors effecting excitation force were figured out by control variable method,which provided theoretical basis for reducing the fluid excitation of rotor.(4) The software of Fluent was used to simulate the flow field inhoneycomb seal gap when the rotor has eccentricity. The characteristics offluid were figured out. Comparison between the vibration force in smooth sealand in honeycomb seal was made, which proofed that honeycomb seal canreduce the exciting vibration force.更多还原