不同过流断面对计量阀门特性的影响

发布时间：2018-06-21 15:56

本文选题：计量阀门 + 流阻特性　；参考：《浙江理工大学》2017年硕士论文

【摘要】：阀门和流量计作为流体控制和计量元件,在石油化工、能源输送、水利水电等行业中起到了重要的作用。在阀门和流量计的实际应用过程中,没有足够的空间来保证它们前后直管道长度要求,进而导致内部流体介质剧烈扰动,影响了流量计的计量精度,很难实现精确控制、精密计量的目的。本文以套筒调节阀和旋进旋涡流量计组成的计量阀门为研究对象,采用数值模拟和实验研究相结合的方法研究计量阀门的流阻特性、计量特性和内部流动特性。为提高计量精度,对计量阀门进行了改进研究。主要研究内容如下:(1)采用三维软件Solidworks对计量阀门的内部流道进行三维建模,并利用Gambit软件进行网格划分。通过对比几种不同类型的湍流模型,选择适合本研究的RNG?-?湍流模型,利用FLUENT软件对计量阀门的内部流动进行数值模拟。并搭建计量阀门研究试验台,分析在不同进口速度和阀门开度下计量阀门的流阻特性、计量特性和内部流动特性。(2)通过数值模拟和实验研究分析了套筒调节阀和旋进旋涡流量计之间的相互影响规律。分析了不同进口速度下,计量阀门的阻力系数和流量系数随阀门开度的变化规律,研究了阀门和流量计的安装位置对计量精度的影响,通过计量阀门的内部流动特性分析计量误差产生的原因。根据套筒调节阀和旋进旋涡流量计的特性,我们更希望阀门安装在流量计的上游。(3)为进一步提高计量精度对计量阀门进行了改进研究,通过增加计量阀门内部直管道的方式来降低旋进旋涡流量计上游的来流扰动,并给出了合理的改进方案。改进后的计量阀门在计量特性方面和内流场稳定性方面都有很大程度的提高。实验结果验证了数值模拟结果的准确性,同时也揭示了计量阀门开发和研究的可行性。
[Abstract]:Valves and Flowmeters, as fluid control and metering components, play an important role in petrochemical, energy transmission, water conservancy and hydropower industries. In the practical application of valve and Flowmeter, there is not enough space to ensure the length requirement of straight pipe, which leads to the severe disturbance of internal fluid medium, which affects the measuring accuracy of Flowmeter, and it is difficult to realize accurate control. The purpose of precise measurement. In this paper, the measurement valve composed of sleeve regulating valve and rotary vortex Flowmeter is taken as the research object, and the flow resistance characteristics, measurement characteristics and internal flow characteristics of the measuring valve are studied by the method of numerical simulation and experimental study. In order to improve the measuring accuracy, the improvement research on the measuring valve was carried out. The main research contents are as follows: (1) 3D software Solidworks is used to model the internal flow channel of the metering valve, and Gambit software is used to mesh the valve. By comparing several different types of turbulence models, the suitable RNG-? In the turbulence model, the internal flow of the measuring valve is numerically simulated by fluent software. At the same time, a measuring valve research test-bed is built to analyze the flow resistance characteristics of the measuring valve under different inlet speed and valve opening. Through numerical simulation and experimental study, the interaction between the sleeve regulating valve and the rotary vortex Flowmeter is analyzed. The variation law of resistance coefficient and flow coefficient with valve opening at different inlet velocities are analyzed, and the influence of valve and Flowmeter installation position on measurement accuracy is studied. The causes of metering errors are analyzed through the internal flow characteristics of metering valves. According to the characteristics of sleeve regulating valve and rotary vortex Flowmeter, we hope that the valve should be installed upstream of the Flowmeter. In order to reduce the upstream disturbance of swirl vortex Flowmeter, a reasonable improvement scheme is given by adding the straight pipe inside the metering valve to reduce the flow disturbance in the upstream of the swirl vortex Flowmeter. The improved metering valve has a great improvement in metering characteristics and internal flow field stability. The experimental results verify the accuracy of the numerical simulation results and reveal the feasibility of the development and research of the metering valves.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH134

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