本文關鍵詞：球閥啟閉動態(tài)特性的數(shù)值模擬和實驗研究　出處：《浙江理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 球閥 啟閉時間 動態(tài)特性 數(shù)值模擬 實驗研究

【摘要】：球閥具有流通能力大、密封性能好、結構緊湊等優(yōu)點，被廣泛地應用在石油煉制、化工、制藥行業(yè)。通常球閥最適宜直接做開閉使用，但是近年來隨著球閥使用越來越廣泛，球閥也逐漸用于節(jié)流和調節(jié)流量的作用。而在調節(jié)過程中，球閥的動態(tài)過程會使球閥及其周圍管路產生漩渦或水擊等，甚至會影響和閥門相連的管路系統(tǒng)。因此，本文對球閥啟閉動態(tài)過程進行數(shù)值模擬和實驗研究，分析球閥啟閉動態(tài)過程對球閥性能曲線及內部流場的影響，為球閥的設計與使用提供參考和依據。主要內容如下： （1）運用三維造型軟件UG對球閥及其內部流場進行三維實體建模，，并利用GAMBIT對內部流道的三維模型進行網格劃分。基于球閥啟閉過程的外特性實驗測試，獲得四種不同開啟和關閉時間（18s、23s、34s和70s）及穩(wěn)態(tài)工況（認為穩(wěn)態(tài)工況是啟閉時間接近無窮大的工況）下流量和閥門進出口壓力隨時間的變化曲線，作為數(shù)值模擬的進出口邊界條件。采用滑動網格技術對球閥啟閉過程進行數(shù)值模擬。 （2）分析實驗獲得的不同啟閉時間下的流量和進出口壓力變化，得到了不同啟閉時間對球閥流量及進出口壓力的影響。并對比分析四種不同開啟和關閉時間及穩(wěn)態(tài)工況下閥門壓差和流阻系數(shù)的實驗與數(shù)值模擬結果。揭示球閥開啟和關閉過程的壓差與流阻特性隨開啟和關閉時間的變化規(guī)律以及球閥開啟和關閉過程的差異性。 （3）對啟閉過程中20%、40%和70%時球閥內部流場進行研究，分析了球閥在20%、40%、70%開度下的壓力和速度場，得到了啟閉時間對啟閉過程內部流場的影響。同時，對34s開啟和關閉工況下，球閥開啟和關閉過程的壓力及速度場進行對比，揭示了球閥開啟和關閉過程內部流動的差異性。
[Abstract]:Ball valve is widely used in petroleum refining, chemical industry and pharmaceutical industry because of its advantages such as large circulation capacity, good sealing performance and compact structure. Usually ball valve is the most suitable for direct opening and closing. But in recent years, with the more and more extensive use of ball valves, ball valves are gradually used to throttle and adjust the flow rate. In the process of adjustment, the dynamic process of ball valves will make the ball valve and its surrounding pipeline produce whirlpool or water hammer. Therefore, numerical simulation and experimental study on the dynamic process of the ball valve opening and closing are carried out to analyze the influence of the dynamic process of the ball valve on the performance curve and internal flow field of the ball valve. To provide reference and basis for the design and use of ball valves. The main contents are as follows: 1) 3D modeling software UG is used to model the ball valve and its internal flow field. GAMBIT is used to mesh the three-dimensional model of the internal flow channel. Based on the experimental test of the external characteristics of the opening and closing process of the ball valve, four different opening and closing times of 18s ~ (23 s) are obtained. Flow and valve inlet and outlet pressure curves under 34 s and 70 s) and steady state conditions (which are considered to be close to infinite opening and closing time). As the inlet and outlet boundary condition of numerical simulation, the sliding grid technique is used to simulate the opening and closing process of ball valve. 2) analyzing the flow rate and the pressure change of inlet and outlet under different opening and closing time. The effects of different opening and closing time on the flow rate and inlet and outlet pressure of ball valve are obtained. The experimental and numerical simulation results of pressure difference and flow resistance coefficient of valve under four different opening and closing times and steady condition are compared and analyzed. The variation of the pressure difference and the flow resistance characteristics with the opening and closing time and the difference of the opening and closing process of the ball valve. The internal flow field of the ball valve at 20% and 70% during the opening and closing process is studied, and the pressure and velocity fields of the ball valve under the opening degree of 20% and 70% are analyzed. The influence of the opening and closing time on the internal flow field of the opening and closing process is obtained. At the same time, the pressure and velocity fields of the opening and closing process of the ball valve under 34s open and close conditions are compared. The difference of internal flow between the opening and closing process of ball valve is revealed.
【學位授予單位】：浙江理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TH134

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