【作者】 张磊；

【导师】 金晓宏；

【作者基本信息】 武汉科技大学 ， 机械电子工程， 2012， 硕士

【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。更多还原

【Abstract】 Valve is a important equipment in pipeline flow control process, and great attention is increasingly paid to its accurate characteristics. The traditional experimental study just can be used to research the macroscopic external characteristics of valve, in addition some defects must bear in the research process such as long period of production design and high cost etc, and the microscopic flow field can not be obtained. With the development and application of CFD theory and CFD software, CFD simulation has increasingly win the good graces of academic and industry circles. The study on visual simulation of3D flow field for venturi flow control valve based on FLUENT is discussed in this paper.The industrial application of venturi flow control valve and development of CFD research on control valve are described in the paper; the characteristics of flow resistance and flow rate of valve are analysed; the related theories of CFD and control equations are discussed; at last according to typical condition of the valve, the CFD visual simulation of venturi flow control valve is created. Concrete works of this paper are as follows.1) To ensure the scientificity of CFD simulation, firstly simulation work of butterfly valve is carried out; the research results of flow field distribution and dynamic moment characteristics is coincide with related CFD theories and control equations, and finally the results show that the unstructured hybrid grid partition method, standard κ-ε turbulence model and the SIMPLE calculation method is reasonable for the flow field calculation in the kind of control valve.2) Pressure inlet and pressure outlet are selected as boundary conditions, according to several different inlet pressure and different valve opening from10°～80°, modeling and meshing respectively; from massive numerical calculation, the velocity and pressure contours, velocity vector and streamline diagrams are obtained in the different inlet pressure and different valve opening; the results are showed that with the influence of flowing around blunt body, the flow field change and the producing and disappearing process of vortex with the valve plate opening changes.3) The aerodynamic moments are calculated in the condition of three kind of inlet pressure and valve plate at different opening, and the law of moment change with opening is obtained; alternating spring loads law of aerodynamic moment is turn on.Finally, the research contents are summarized, and the future research focus is point out.更多还原