安全阀内流场瞬态数值模拟及测试装置研发

发布时间：2018-03-03 17:48

本文选题：安全阀　切入点：数值模拟　出处：《华东理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：安全阀是承压系统中重要的安全附件之一。本文结合核电主蒸汽安全阀全性能试验的热态试验装置对安全阀进行瞬态数值模拟。其主要研究内容包括： (1)本文对安全阀进行了稳态模拟和瞬态模拟的比较,得到了瞬态模拟更符合安全阀的实际泄放情况。然后对安全阀内流场开启到关闭整个过程进行了定性与定量分析。定性分析知道了双调节圈安全阀的临界流出现在上下调节圈,阀座,阀瓣组成的环形区域和出口管道至外接容器段,并没有出现在喉径处；定量分析发现由于流体介质在安全阀开启的初始过程中处于高速喷射状态,导致了阀瓣速度,流体作用力的剧烈震荡,随着安全阀的排放,震荡会越来越小,直到趋于平衡状态。 (2)本文研究了安全阀开启过程动态特性及其影响因素。包括入口压力,弹簧刚度,承压容器大小等因素。知道了安全阀弹簧的刚度和承压容器的大小对安全阀排放的动态特性影响比较大。为了安全阀流体介质的正常泄放,弹簧的选取一定要合理。弹簧刚度太大会致使安全阀不能迅速起跳,介质得不到有效的泄放；太小则会导致安全阀开启到最大位移时,对反冲盘的冲击过大,导致阀瓣与反冲盘易于损坏。 (3)本文详细的介绍了一种测量安全阀热态机械性能的试验装置与方法。此试验装置具有一般试验装置没有的优点,包括防止安全阀测试过程的频跳、测量精度高、安全性能强、系统运行稳定、自动化程度高等。
[Abstract]:The safety valve is one of the important safety accessories in the pressure system. The transient numerical simulation of the safety valve is carried out in this paper combined with the hot state test device of the main steam safety valve in nuclear power plant. The main research contents are as follows:. In this paper, the steady state simulation and transient simulation of safety valve are compared. The transient simulation is more in line with the actual discharge situation of the safety valve. Then the whole process of opening to closing the internal flow field of the safety valve is qualitatively and quantitatively analyzed. The qualitative analysis shows that the critical flow out of the double regulating ring safety valve is now up and down the regulating ring. Seat, disc ring area and outlet pipe to external container section, not at throat diameter; quantitative analysis shows that the fluid medium is in a high velocity jet state during the initial opening of the relief valve, resulting in disc velocity, The violent oscillation of fluid force, as the relief valve discharge, will become smaller and smaller until the state of balance. This paper studies the dynamic characteristics of safety valve opening process and its influencing factors, including inlet pressure, spring stiffness, It is known that the stiffness of the relief valve spring and the size of the pressure vessel have great influence on the dynamic characteristics of the relief valve discharge. The spring must be selected reasonably. The spring stiffness is too general to cause the relief valve to take off quickly, and the medium can not be effectively released; too small will cause the relief valve to open to the maximum displacement, and the impact on the recoil disk will be too great. Causes disc and recoil disc to be easily damaged. This paper introduces in detail a test device and method for measuring the hot mechanical properties of the safety valve. This test device has the advantages of preventing the frequency hopping during the testing process of the safety valve, high measuring accuracy and strong safety performance. The system runs stably and has high degree of automation.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH134

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