本文選題：截止閥 + 閥芯　； 參考：《浙江理工大學(xué)》2012年碩士論文

【摘要】：截止閥是流體傳動與控制中的重要基礎(chǔ)元件，在實(shí)際工作中，，截止閥閥芯在啟閉過程中的內(nèi)部流場特性對截止閥的工作性能有著重大影響。因此，掌握流體在閥體內(nèi)部的流動機(jī)理，對設(shè)計(jì)合理的截止閥閥芯結(jié)構(gòu)及其節(jié)能減耗有著重要的意義。而CFD技術(shù)的快速發(fā)展為深入研究截止閥內(nèi)部復(fù)雜流場提供了強(qiáng)有力的手段。因此，論文以截止閥為研究對象，采用數(shù)值模擬與試驗(yàn)研究相結(jié)合的方法，分別對截止閥閥芯改進(jìn)前后兩種結(jié)構(gòu)，及閥芯靜止和閥芯運(yùn)動兩種狀態(tài)下，對截止閥內(nèi)部流場進(jìn)行了數(shù)值計(jì)算研究，并對閥門的外特性進(jìn)行了試驗(yàn)研究。具體內(nèi)容如下： 1.對截止閥閥芯結(jié)構(gòu)進(jìn)行了優(yōu)化設(shè)計(jì)，得到了一種具有多密封及分流減壓結(jié)構(gòu)的截止閥閥芯結(jié)構(gòu)。依據(jù)截止閥的尺寸結(jié)構(gòu)，利用三維實(shí)體建模軟件Pro/E，對截止閥包括閥體、閥蓋、閥芯及其連接部件進(jìn)行了三維實(shí)體建模�；贑FD多塊網(wǎng)格技術(shù)，采用對復(fù)雜結(jié)構(gòu)適應(yīng)性強(qiáng)的非結(jié)構(gòu)化網(wǎng)格對閥體流道的計(jì)算域進(jìn)行離散，并運(yùn)用前處理軟件Gambit進(jìn)行網(wǎng)格生成。 2.基于三維雷諾時(shí)均N-S控制方程及標(biāo)準(zhǔn)湍流模型，在閥芯不同固定開度下，對截止閥內(nèi)的流動狀態(tài)進(jìn)行了定常的全三維數(shù)值研究。分析了不同流量工況下閥體內(nèi)部的壓力、速度和流線分布規(guī)律；對比分析了截止閥閥芯改進(jìn)前后的閥體內(nèi)部壓力場和速度場的分布規(guī)律；同時(shí)也分析了閥芯改進(jìn)前后閥門密封部位的速度和壓力的分布規(guī)律。 3.對瞬態(tài)工況下截止閥內(nèi)部流場特性進(jìn)行了數(shù)值模擬研究�；趧泳W(wǎng)格技術(shù)，采用Fluent的UDF功能，定義了閥芯啟閉過程的運(yùn)動速度。對比分析了改進(jìn)前后的截止閥閥芯在運(yùn)動狀態(tài)下閥體內(nèi)的壓力、速度和流線分布規(guī)律，揭示了閥芯在啟閉過程中受到的流體擠壓效應(yīng)是影響截止閥性能的主要原因，對今后截止閥閥芯結(jié)構(gòu)和內(nèi)部流道設(shè)計(jì)有著重要的意義。 4.對截止閥進(jìn)行了外特性試驗(yàn)研究，得到了截止閥不同開度、不同工況下外特性性能曲線，并與數(shù)值模擬結(jié)果進(jìn)行了對比分析。
[Abstract]:The globe valve is an important basic component in fluid transmission and control. In practice, the internal flow field characteristics of the valve core in the process of opening and closing have a significant impact on the performance of the valve. Therefore, mastering the flow mechanism of fluid in the valve body is of great significance to the reasonable design of valve core structure and energy saving and consumption reduction. The rapid development of CFD technology provides a powerful means to study the complex flow field inside the globe valve. Therefore, the thesis takes the globe valve as the research object, adopts the method of numerical simulation and experimental study, improves the valve core before and after the two kinds of structure, and the valve core static and the valve core movement two kinds of states respectively. The internal flow field of the globe valve is numerically calculated and the external characteristics of the valve are experimentally studied. The details are as follows: 1. The valve core structure was optimized and a valve core structure with multi-seal and split pressure relief was obtained. According to the size structure of the globe valve, the three-dimensional solid modeling software Prop / E was used to model the valve including the valve body, the valve cover, the valve core and its connecting parts. Based on CFD multi-block grid technology, unstructured grids with strong adaptability to complex structures are used to discretize the computational domain of valve body flow channels, and the pre-processing software Gambit is used to generate grids. 2. Based on the three-dimension Reynolds time-averaged N-S governing equation and standard turbulence model, the flow state in the valve was studied with different fixed opening of valve core. The distribution law of pressure, velocity and streamline inside the valve body under different flow conditions is analyzed, and the distribution of pressure field and velocity field inside the valve body before and after the improvement of the valve core is compared and analyzed. At the same time, the distribution law of the speed and pressure of the valve seal before and after the improvement of the valve core is also analyzed. 3. The internal flow field characteristics of the globe valve under transient conditions are numerically simulated. Based on the technology of moving grid and UDF function of Fluent, the moving speed of the valve core during the process of opening and closing is defined. The distribution laws of pressure, velocity and streamline in the valve body under the moving state of the valve core before and after the improvement are compared and analyzed. It is revealed that the fluid extrusion effect of the valve core in the process of opening and closing is the main reason that affects the performance of the valve. It is of great significance for the design of valve core and internal runner in the future. 4. In this paper, the external characteristic curve of the globe valve under different opening and working conditions is obtained, and the results are compared with the numerical simulation results.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH134

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