基于CFD的旋塞阀流动特性研究

发布时间：2019-07-05 07:22

【摘要】：旋塞阀是管线阀门中的一种,其作用就是截流。它的结构设计安全性能高,使用方便,密封性好。随着我国制造行业的不断发展,很多行业对旋塞阀提出了更高的要求。它在很多领域都有一席之地,最广泛的还是在天然气、石油管道中使用。然而天然气、石油都为易燃物品,所以对旋塞阀的性能要求更加严格,尤其是高压大口径旋塞阀,由于强度不能满足,导致漏气、漏油等现象,严重时会发生燃烧、爆炸、中毒等恶性事故。所以对高压大口径旋塞阀内部流场的研究就显得尤为重要。根据实际情况,旋塞阀内部流场分为两种介质,一种为可压缩气体,另一种为不可压缩液体。两种不同材料都会在旋塞阀内部出现复杂运动,属性的差异导致内部流场运动又有不同。因此,不同的工况对整个旋塞阀的安全运作有着至关重要的影响。为了使旋塞阀安全、可靠地运作,基于CFD理论,对旋塞阀内部流场数值模拟,重点研究了旋塞阀在不同开度下的流道内部静压分布、速度矢量图与压差情况,这能有效改善的可靠性、安全性、使用寿命以及减少生产试验样机的成本。本文通过对旋塞阀内部流场的数值模拟仿真以及对两种使用材料的对比,研究了理想气体和液体水对旋塞阀的不同影响,探索了可压缩气体和不可压缩液体在阀内的各物理量关系曲线。本论文主要内容如下:(1)基于Solid Works对旋塞阀三大主要过流部件进行三维建模;基于ANSYS DM对流场进行二维简化建模;基于ICEM CFD对模型划分网格。(2)采用ANSYS Workbench平台的FLUENT模块,基于标准k??湍流方程对旋塞阀内部流体在不同旋转角度下进行了二维定常湍流数值模拟,得到了流体静压分布,速度矢量图、相关物理量曲线图,研究了旋转角度下对旋塞阀的影响,为旋塞阀结构特性研究提供了理论依据。
[Abstract]:Plug valve is one of the pipeline valves, its function is to close the flow. Its structural design has high safety performance, convenient use and good sealing. With the continuous development of manufacturing industry in China, many industries have put forward higher requirements for plug valves. It has a place in many fields, the most widely used in natural gas, oil pipelines. However, natural gas and oil are flammable, so the performance requirements of plug valve are more strict, especially the high pressure and large caliber plug valve, because the strength can not be satisfied, resulting in air leakage, oil leakage and other phenomena, such as combustion, explosion, poisoning and other malignant accidents will occur in serious cases. Therefore, it is particularly important to study the flow field in the high pressure and large diameter plug valve. According to the actual situation, the flow field in the plug valve is divided into two kinds of media, one is compressible gas, the other is incompressible liquid. Two different materials will appear complex motion in the plug valve, and the difference of properties leads to the difference of the internal flow field motion. Therefore, different working conditions have a vital impact on the safe operation of the whole plug valve. In order to make the plug valve operate safely and reliably, based on CFD theory, the static pressure distribution, velocity vector diagram and pressure difference in the flow channel of the plug valve under different opening degrees are studied, which can effectively improve the reliability, safety, service life and reduce the cost of the production test prototype. In this paper, through the numerical simulation of the internal flow field of the plug valve and the comparison of the two kinds of materials, the different effects of ideal gas and liquid water on the plug valve are studied, and the physical quantity relationship curves of the compressed gas and the incompressible liquid in the valve are explored. The main contents of this paper are as follows: (1) 3D modeling of the three main flow components of plug valve based on Solid Works; two-dimensional simplified modeling of flow field based on ANSYS DM; meshing of model based on ICEM CFD. (2) FLUENT module based on ANSYS Workbench platform, based on standard k? The two-dimensional steady turbulence numerical simulation of the internal fluid in the plug valve at different rotation angles is carried out by turbulence equation. The hydrostatic pressure distribution, velocity vector diagram and related physical quantity curves are obtained. The influence of the rotation angle on the plug valve is studied, which provides a theoretical basis for the study of the structural characteristics of the plug valve.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH134

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