文丘利气流控制阀流场三维可视化数值仿真的研究
发布时间：2018-12-09 13:55
【摘要】：阀门作为管路流量控制过程中重要设备，其精确特性日益受到重视。阀门传统的试验研究方法只能获得阀门的宏观外部特性，并且周期长，成本高，不能获得阀门内部的微观流场结构和精确特性。随着CFD理论及CFD模拟软件的发展，CFD可视化模拟越来越受到学术和工业界的青睐。本文对基于FLUENT的文丘利气流控制阀的三维可视化模拟仿真进行了研究。 本文对文丘利气流控制阀的工业用途和有关调节阀门的CFD研究现状及相关理论研究进展进行了阐述；对文丘利气流控制阀门的流阻及流量特性进行了分析；讨论了与文丘利阀流动相关的CFD理论及控制方程；最后针对文丘利气流控制阀的典型工况进行了CFD可视化模拟仿真。本文具体工作如下： 1）为了保证本文CFD计算的科学性，在对文丘利气流控制阀进行流场计算模拟之前，首先对现有的中心对称蝶阀进行了模拟研究；将蝶阀的流场分布及动力矩特性的研究结果，与相关理论及文献上的结果进行对比，，结果是相当吻合的，从而验证了非结构混合网格技术，标准κε湍流模式和非结构网格SIMPLE算法对这一类气流控制阀门流场计算的合理性。 2）以压力入口和压力出口为边界条件，通过对三种不同的入口压力情况，以及阀板处于10°～80°的不同开度状态，分别进行了建模和网格划分；通过大量的仿真计算得出了不同入口压力条件及阀板分别处于不同开度时的速度及压力云图，速度矢量图和流线图；很好地反映出了阀板钝体绕流作用下，阀板前后流场变化情况及随着阀门开启过程中漩涡的产生及消失过程。 3）对三种压力入口条件及处于不同开度时阀板所受到的气动力矩进行了计算，得出了阀板所受的气动合力矩随阀板开度变化的曲线图；反映出了该阀门的气动力矩呈现出交变弹性负载规律。 最后对本文研究内容进行了总结，并对本课题的进一步研究进行了展望。
[Abstract]:Valve as an important equipment in pipe flow control process, its accurate characteristics are paid more and more attention. The traditional method of valve test and research can only obtain the macroscopic external characteristics of the valve, and the cycle is long, the cost is high, and the microscopic flow field structure and accurate characteristics of the valve can not be obtained. With the development of CFD theory and CFD simulation software, CFD visualization simulation is more and more popular in academic and industry. In this paper, the three-dimensional visual simulation of Venturi airflow control valve based on FLUENT is studied. In this paper, the industrial use of Venturi airflow control valve, the CFD research status of regulating valve and related theoretical research progress are described, and the flow resistance and flow characteristics of Venturi airflow control valve are analyzed. The CFD theory and control equation related to Venturi valve flow are discussed. Finally, the visual simulation of Venturi airflow control valve by CFD is carried out. The specific work of this paper is as follows: 1) in order to ensure the scientific nature of the CFD calculation in this paper, the existing centrosymmetric butterfly valve is simulated before the flow field simulation of the Venturi airflow control valve; The results of flow field distribution and dynamic moment characteristics of butterfly valve are compared with those of related theory and literature, and the results are in good agreement, thus verifying the unstructured hybrid grid technology. The rationality of standard 魏 蔚 turbulence model and unstructured grid SIMPLE algorithm for calculating the flow field of this kind of airflow control valve. 2) taking the pressure inlet and the pressure outlet as the boundary conditions, three different inlet pressure conditions and the different opening states of the valve plate in the range of 10 掳~ 80 掳were established and meshed, respectively; The velocity and pressure cloud diagram, velocity vector diagram and streamline diagram of different inlet pressure condition and valve plate in different opening degree are obtained by a large number of simulation calculations. The change of flow field before and after the valve plate and the process of vortex generation and disappearance in the process of valve opening under the action of the blunt body of valve plate are well reflected. 3) the three pressure inlet conditions and the aerodynamic moment of the valve plate at different opening degrees are calculated, and the curves of the aerodynamic force moment of the valve plate with the opening degree of the valve plate are obtained. The aerodynamic moment of the valve shows the law of alternating elastic load. Finally, the research content is summarized, and the further research of this topic is prospected.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH138.52
本文编号：2369466
[Abstract]:Valve as an important equipment in pipe flow control process, its accurate characteristics are paid more and more attention. The traditional method of valve test and research can only obtain the macroscopic external characteristics of the valve, and the cycle is long, the cost is high, and the microscopic flow field structure and accurate characteristics of the valve can not be obtained. With the development of CFD theory and CFD simulation software, CFD visualization simulation is more and more popular in academic and industry. In this paper, the three-dimensional visual simulation of Venturi airflow control valve based on FLUENT is studied. In this paper, the industrial use of Venturi airflow control valve, the CFD research status of regulating valve and related theoretical research progress are described, and the flow resistance and flow characteristics of Venturi airflow control valve are analyzed. The CFD theory and control equation related to Venturi valve flow are discussed. Finally, the visual simulation of Venturi airflow control valve by CFD is carried out. The specific work of this paper is as follows: 1) in order to ensure the scientific nature of the CFD calculation in this paper, the existing centrosymmetric butterfly valve is simulated before the flow field simulation of the Venturi airflow control valve; The results of flow field distribution and dynamic moment characteristics of butterfly valve are compared with those of related theory and literature, and the results are in good agreement, thus verifying the unstructured hybrid grid technology. The rationality of standard 魏 蔚 turbulence model and unstructured grid SIMPLE algorithm for calculating the flow field of this kind of airflow control valve. 2) taking the pressure inlet and the pressure outlet as the boundary conditions, three different inlet pressure conditions and the different opening states of the valve plate in the range of 10 掳~ 80 掳were established and meshed, respectively; The velocity and pressure cloud diagram, velocity vector diagram and streamline diagram of different inlet pressure condition and valve plate in different opening degree are obtained by a large number of simulation calculations. The change of flow field before and after the valve plate and the process of vortex generation and disappearance in the process of valve opening under the action of the blunt body of valve plate are well reflected. 3) the three pressure inlet conditions and the aerodynamic moment of the valve plate at different opening degrees are calculated, and the curves of the aerodynamic force moment of the valve plate with the opening degree of the valve plate are obtained. The aerodynamic moment of the valve shows the law of alternating elastic load. Finally, the research content is summarized, and the further research of this topic is prospected.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH138.52
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