發(fā)布時(shí)間：2018-01-13 14:18

  本文關(guān)鍵詞：球閥啟閉動(dòng)態(tài)特性的數(shù)值模擬和實(shí)驗(yàn)研究　出處：《浙江理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 球閥 啟閉時(shí)間 動(dòng)態(tài)特性 數(shù)值模擬 實(shí)驗(yàn)研究

【摘要】：球閥具有流通能力大、密封性能好、結(jié)構(gòu)緊湊等優(yōu)點(diǎn)，被廣泛地應(yīng)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(lái)隨著球閥使用越來(lái)越廣泛，球閥也逐漸用于節(jié)流和調(diào)節(jié)流量的作用。而在調(diào)節(jié)過(guò)程中，球閥的動(dòng)態(tài)過(guò)程會(huì)使球閥及其周圍管路產(chǎn)生漩渦或水擊等，甚至?xí)绊懞烷y門相連的管路系統(tǒng)。因此，本文對(duì)球閥啟閉動(dòng)態(tài)過(guò)程進(jìn)行數(shù)值模擬和實(shí)驗(yàn)研究，分析球閥啟閉動(dòng)態(tài)過(guò)程對(duì)球閥性能曲線及內(nèi)部流場(chǎng)的影響，為球閥的設(shè)計(jì)與使用提供參考和依據(jù)。主要內(nèi)容如下： （1）運(yùn)用三維造型軟件UG對(duì)球閥及其內(nèi)部流場(chǎng)進(jìn)行三維實(shí)體建模，，并利用GAMBIT對(duì)內(nèi)部流道的三維模型進(jìn)行網(wǎng)格劃分。基于球閥啟閉過(guò)程的外特性實(shí)驗(yàn)測(cè)試，獲得四種不同開啟和關(guān)閉時(shí)間（18s、23s、34s和70s）及穩(wěn)態(tài)工況（認(rèn)為穩(wěn)態(tài)工況是啟閉時(shí)間接近無(wú)窮大的工況）下流量和閥門進(jìn)出口壓力隨時(shí)間的變化曲線，作為數(shù)值模擬的進(jìn)出口邊界條件。采用滑動(dòng)網(wǎng)格技術(shù)對(duì)球閥啟閉過(guò)程進(jìn)行數(shù)值模擬。 （2）分析實(shí)驗(yàn)獲得的不同啟閉時(shí)間下的流量和進(jìn)出口壓力變化，得到了不同啟閉時(shí)間對(duì)球閥流量及進(jìn)出口壓力的影響。并對(duì)比分析四種不同開啟和關(guān)閉時(shí)間及穩(wěn)態(tài)工況下閥門壓差和流阻系數(shù)的實(shí)驗(yàn)與數(shù)值模擬結(jié)果。揭示球閥開啟和關(guān)閉過(guò)程的壓差與流阻特性隨開啟和關(guān)閉時(shí)間的變化規(guī)律以及球閥開啟和關(guān)閉過(guò)程的差異性。 （3）對(duì)啟閉過(guò)程中20%、40%和70%時(shí)球閥內(nèi)部流場(chǎng)進(jìn)行研究，分析了球閥在20%、40%、70%開度下的壓力和速度場(chǎng)，得到了啟閉時(shí)間對(duì)啟閉過(guò)程內(nèi)部流場(chǎng)的影響。同時(shí)，對(duì)34s開啟和關(guān)閉工況下，球閥開啟和關(guān)閉過(guò)程的壓力及速度場(chǎng)進(jìn)行對(duì)比，揭示了球閥開啟和關(guān)閉過(guò)程內(nèi)部流動(dòng)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(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH134

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 趙瑩;周進(jìn);;球閥流場(chǎng)的數(shù)值模擬與可視化研究[J];導(dǎo)彈與航天運(yùn)載技術(shù);2007年06期

2 劉剛,方金春,雍歧衛(wèi);調(diào)節(jié)閥動(dòng)態(tài)特性的數(shù)值模擬[J];閥門;2004年04期

3 吳石,張文平;閥門流場(chǎng)的數(shù)值模擬及流噪聲的實(shí)驗(yàn)研究[J];閥門;2005年01期

4 鄭建光,劉長(zhǎng)海;電動(dòng)球閥流量特性實(shí)驗(yàn)研究[J];閥門;2005年01期

5 何忠華;袁一星;邱微;;給水管網(wǎng)球閥局部阻力系數(shù)計(jì)算研究[J];供水技術(shù);2012年04期

6 李廣軍;王彥枝;;偏心半球閥流場(chǎng)數(shù)值模擬與分析[J];閥門;2013年02期

7 伍悅濱,曲世琳,張維佳,趙洪賓;給水管網(wǎng)中閥門阻力實(shí)驗(yàn)研究[J];哈爾濱工業(yè)大學(xué)學(xué)報(bào);2003年11期

8 韓斐;宋筆鋒;喻天翔;崔衛(wèi)民;;閥門可靠性技術(shù)研究現(xiàn)狀和展望[J];機(jī)床與液壓;2008年09期

9 沈新榮;潘康;單力鈞;徐煒芳;;調(diào)節(jié)型球閥流量特性的數(shù)值分析與實(shí)驗(yàn)研究[J];流體傳動(dòng)與控制;2008年01期

10 張穎;戴光;王兵;劉鵬;;基于Lighthill方程的球閥氣體內(nèi)漏噴流聲場(chǎng)數(shù)值模擬[J];流體機(jī)械;2008年07期

本文編號(hào)：1419199