基于先导控制的新型截止阀启闭特性的研究

发布时间：2018-06-07 08:17

本文选题：先导式截止阀 + 启闭流场特性　；参考：《浙江大学》2011年硕士论文

【摘要】：基于先导控制的截止阀是一种利用介质压差实现启闭的新型阀门,具有结构简单、驱动能耗低、启闭快速等特点。但目前尚缺乏系统的理论研究、数值分析和试验验证,尤其在启闭特性方面缺少相关研究,而启闭特性的优劣关系直接影响阀门整体性能的体现,甚至影响整个管路系统的稳定性和安全性。为此本文采用数值模拟和实验研究相结合的方法,对先导式截止阀的流场特性、阀芯受力和运动特性以及弹簧选型等进行研究。主要研究内容和研究成果如下： 1、通过先导式截止阀的稳态研究,初步验证了利用压差启闭原理的可行性和阀门结构的合理性；研究了不同条件对稳态流场的影响；分析了稳态压差液动力,为动态模拟奠定了基础。 2、建立了阀芯受力方程和运动方程,并以此为依据编写了UDF程序,使新型先导式截止阀的动态模拟成为可能,为此类阀门的数值模拟奠定了基础。 3、描述了先导式截止阀动态启闭过程,通过分析启闭时阀门流场和阀芯受力、位移及速度随时间的变化,对阀门的动态启闭过程有了更加全面和清晰的认识；研究了不同条件对动态启闭流场特性的影响,分别总结了开启和关闭时,不同入口压力、弹簧刚度和先导时间对阀门内部流场变化所产生的规律,为先导式截止阀的应用和设计具有指导作用；揭示了不同条件对阀芯运动特性的影响,分别总结了开启和关闭时,不同入口压力、弹簧刚度和先导时间对阀芯运动过程、阀芯稳定位移和阀芯启闭时间的规律,为先导式截止阀启闭过程的进一步优化奠定了基础。 4、归纳了弹簧初步选型公式,并针对此公式进行实验研究。一方面通过实验数据得到规律,验证了数值模拟定性分析的正确性；另一方面对比实验数据与模拟数据,也证明了数值模拟定量分析的合理性。修正后的选型公式减少了设计时的盲目性,提高了设计的效率。本文研究成果对基于先导控制的新型截止阀的优化、设计以及工程应用具有重要的学术意义和工程应用价值。
[Abstract]:The globe valve based on pilot control is a new type of valve which uses the medium pressure difference to realize the opening and closing. It has the characteristics of simple structure, low driving energy consumption and fast opening and closing. However, there is a lack of systematic theoretical research, numerical analysis and experimental verification, especially in the aspects of the opening and closing characteristics, and the relationship between the opening and closing characteristics directly affects the performance of the valve as a whole. It even affects the stability and safety of the whole pipeline system. In this paper, numerical simulation and experimental study are used to study the flow field characteristics, the force and motion characteristics of the spool and the spring selection of the pilot globe valve. The main research contents and results are as follows: 1. Through the steady-state research of pilot globe valve, the feasibility of using the principle of differential pressure opening and closing and the rationality of valve structure are preliminarily verified, the influence of different conditions on steady flow field is studied, and the steady state pressure differential fluid dynamics is analyzed. It lays a foundation for dynamic simulation. 2. The stress equation and motion equation of the valve core are established, and the UDF program is compiled on the basis of which the dynamic simulation of a new type of pilot globe valve is possible, which lays a foundation for the numerical simulation of this kind of valve. 3. The dynamic opening and closing process of pilot globe valve is described. By analyzing the change of valve flow field and valve core force, displacement and speed with time, the dynamic opening and closing process of valve has a more comprehensive and clear understanding. The effects of different conditions on the flow field characteristics of dynamic opening and closing are studied, and the rules of different inlet pressure, spring stiffness and lead time on the change of flow field in valve are summarized, respectively. It can guide the application and design of pilot globe valve, reveal the influence of different conditions on the movement characteristics of valve core, summarize the different inlet pressure, spring stiffness and lead time on the movement process of valve core when opening and closing, respectively. The steady displacement of the valve core and the opening and closing time of the valve core lay a foundation for the further optimization of the opening and closing process of the pilot globe valve. 4. The formula of spring selection is summarized, and the experimental study is carried out. On the one hand, the regularity of numerical simulation qualitative analysis is verified by experimental data; on the other hand, the rationality of numerical simulation quantitative analysis is proved by comparing experimental data with simulation data. The modified formula reduces the blindness and improves the efficiency of design. The research results of this paper have important academic significance and engineering application value for optimization, design and engineering application of new type of globe valve based on pilot control.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134

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