安全阀反冲效应的数值模拟与实验研究

发布时间：2018-02-26 01:19

本文关键词： 安全阀反冲效应反冲盘传感器　出处：《华南理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：作为一种防止超压的安全装置，安全阀在超压介质的作用下迅速开启和及时排放是最重要的性能指标之一。从安全阀的动力学得知全启式安全阀的反冲盘产生的反冲效应对于安全阀的快速开启起着重要的作用，安全阀不需要很大的压力就借助于反冲效应使得开启力成倍增加，，因而反冲效应的研究至关重要。但是到目前为止，很少有公开发表的文献探讨和研究这个问题。本文从理论和实验两方面来定量分析反冲效应。理论部分：1）首先利用Pro/E软件建立三维非对称模型，基于动网格和流固耦合技术，通过数值模拟分析软件CFX对安全阀超压泄放过程进行了动态模拟，并结合反冲效应的物理意义，克服目前反冲效应研究的局限性，利用区域分解法，实现了对反冲效应的定量计算。并与二维对称模型结果进行对比。2）通过改变影响反冲效应的相关结构参数，探讨反冲效应与关键结构参数之间的关系。实验部分：1）结合安全阀在线检测系统，得到上下阀瓣的压力检测曲线，再通过反冲效应的物理意义得到了全开启过程的反冲力曲线，并与模拟结果进行对比；2）通过改变反冲盘结构，在反冲盘下边缘上设置检测点，得到了开启过程中检测点的压力变化曲线，并与模拟结果相应点的压力进行对比，验证了方法的合理性。通过实验和模拟计算实现了对安全阀反冲效应的定量计算，同时得到了反冲力与关键结构参数之间的关系，可通过改变它们来控制反冲效应的大小，对安全阀性能分析具有重要的意义。
[Abstract]:As a safety device to prevent overpressure, The quick opening and timely discharge of safety valve under the action of overpressure medium is one of the most important performance indexes. From the dynamics of safety valve, we know that the recoil effect of full open safety valve backflushing effect on the quick opening of safety valve. Plays an important role, The safety valve does not need a great deal of pressure to double the opening force by means of recoil effect, so the study of recoil effect is very important, but so far, there are few published papers to discuss and study this problem. In this paper, the recoil effect is quantitatively analyzed from both theoretical and experimental aspects. Firstly, the three-dimensional asymmetric model is established by using Pro/E software. Based on the dynamic grid and fluid-solid coupling technology, the overpressure release process of the relief valve is simulated dynamically by the numerical simulation software CFX. Combining with the physical meaning of recoil effect and overcoming the limitation of current research on recoil effect, the domain decomposition method is used. The quantitative calculation of recoil effect is realized and compared with the results of two-dimensional symmetric model. 2) the relationship between backflushing effect and key structural parameters is discussed by changing the relevant structural parameters which affect the recoil effect. The experimental part: 1) combining with the safety valve on-line detection system, the pressure detection curve of the upper and lower disc is obtained, and then the recoil force curve of the whole open process is obtained through the physical meaning of the backflushing effect. By changing the structure of the recoil disk and setting the detection point on the edge of the recoil disk, the pressure change curve of the detecting point in the opening process is obtained, and the pressure of the corresponding point in the simulation result is compared with that of the simulation result. The rationality of the method is verified. The quantitative calculation of recoil effect of safety valve is realized by experiment and simulation, and the relation between recoil force and key structural parameters is obtained. The magnitude of recoil effect can be controlled by changing them. It is of great significance to analyze the performance of safety valve.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH134

【引证文献】