本文選題：截止閥 + 閥芯　； 參考：《浙江理工大學》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元件，在實際工作中，，截止閥閥芯在啟閉過程中的內部流場特性對截止閥的工作性能有著重大影響。因此，掌握流體在閥體內部的流動機理，對設計合理的截止閥閥芯結構及其節(jié)能減耗有著重要的意義。而CFD技術的快速發(fā)展為深入研究截止閥內部復雜流場提供了強有力的手段。因此，論文以截止閥為研究對象，采用數值模擬與試驗研究相結合的方法，分別對截止閥閥芯改進前后兩種結構，及閥芯靜止和閥芯運動兩種狀態(tài)下，對截止閥內部流場進行了數值計算研究，并對閥門的外特性進行了試驗研究。具體內容如下： 1.對截止閥閥芯結構進行了優(yōu)化設計，得到了一種具有多密封及分流減壓結構的截止閥閥芯結構。依據截止閥的尺寸結構，利用三維實體建模軟件Pro/E，對截止閥包括閥體、閥蓋、閥芯及其連接部件進行了三維實體建模�；贑FD多塊網格技術，采用對復雜結構適應性強的非結構化網格對閥體流道的計算域進行離散，并運用前處理軟件Gambit進行網格生成。 2.基于三維雷諾時均N-S控制方程及標準湍流模型，在閥芯不同固定開度下，對截止閥內的流動狀態(tài)進行了定常的全三維數值研究。分析了不同流量工況下閥體內部的壓力、速度和流線分布規(guī)律；對比分析了截止閥閥芯改進前后的閥體內部壓力場和速度場的分布規(guī)律；同時也分析了閥芯改進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)工況下截止閥內部流場特性進行了數值模擬研究�；趧泳W格技術，采用Fluent的UDF功能，定義了閥芯啟閉過程的運動速度。對比分析了改進前后的截止閥閥芯在運動狀態(tài)下閥體內的壓力、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是影響截止閥性能的主要原因，對今后截止閥閥芯結構和內部流道設計有著重要的意義。 4.對截止閥進行了外特性試驗研究，得到了截止閥不同開度、不同工況下外特性性能曲線，并與數值模擬結果進行了對比分析。
[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.
【學位授予單位】：浙江理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH134

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