【摘要】：旋塞閥是管線閥門中的一種,其作用就是截流。它的結(jié)構(gòu)設(shè)計(jì)安全性能高,使用方便,密封性好。隨著我國(guó)制造行業(yè)的不斷發(fā)展,很多行業(yè)對(duì)旋塞閥提出了更高的要求。它在很多領(lǐng)域都有一席之地,最廣泛的還是在天然氣、石油管道中使用。然而天然氣、石油都為易燃物品,所以對(duì)旋塞閥的性能要求更加嚴(yán)格,尤其是高壓大口徑旋塞閥,由于強(qiáng)度不能滿足,導(dǎo)致漏氣、漏油等現(xiàn)象,嚴(yán)重時(shí)會(huì)發(fā)生燃燒、爆炸、中毒等惡性事故。所以對(duì)高壓大口徑旋塞閥內(nèi)部流場(chǎng)的研究就顯得尤為重要。根據(jù)實(shí)際情況,旋塞閥內(nèi)部流場(chǎng)分為兩種介質(zhì),一種為可壓縮氣體,另一種為不可壓縮液體。兩種不同材料都會(huì)在旋塞閥內(nèi)部出現(xiàn)復(fù)雜運(yùn)動(dòng),屬性的差異導(dǎo)致內(nèi)部流場(chǎng)運(yùn)動(dòng)又有不同。因此,不同的工況對(duì)整個(gè)旋塞閥的安全運(yùn)作有著至關(guān)重要的影響。為了使旋塞閥安全、可靠地運(yùn)作,基于CFD理論,對(duì)旋塞閥內(nèi)部流場(chǎng)數(shù)值模擬,重點(diǎn)研究了旋塞閥在不同開(kāi)度下的流道內(nèi)部靜壓分布、速度矢量圖與壓差情況,這能有效改善的可靠性、安全性、使用壽命以及減少生產(chǎn)試驗(yàn)樣機(jī)的成本。本文通過(guò)對(duì)旋塞閥內(nèi)部流場(chǎng)的數(shù)值模擬仿真以及對(duì)兩種使用材料的對(duì)比,研究了理想氣體和液體水對(duì)旋塞閥的不同影響,探索了可壓縮氣體和不可壓縮液體在閥內(nèi)的各物理量關(guān)系曲線。本論文主要內(nèi)容如下:(1)基于Solid Works對(duì)旋塞閥三大主要過(guò)流部件進(jìn)行三維建模;基于ANSYS DM對(duì)流場(chǎng)進(jìn)行二維簡(jiǎn)化建模;基于ICEM CFD對(duì)模型劃分網(wǎng)格。(2)采用ANSYS Workbench平臺(tái)的FLUENT模塊,基于標(biāo)準(zhǔn)k??湍流方程對(duì)旋塞閥內(nèi)部流體在不同旋轉(zhuǎn)角度下進(jìn)行了二維定常湍流數(shù)值模擬,得到了流體靜壓分布,速度矢量圖、相關(guān)物理量曲線圖,研究了旋轉(zhuǎn)角度下對(duì)旋塞閥的影響,為旋塞閥結(jié)構(gòu)特性研究提供了理論依據(jù)。
[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.
【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH134

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