本文關鍵詞：基于先導控制的新型截止閥動力特性研究　出處：《浙江大學》2011年碩士論文　論文類型：學位論文

  更多相關文章： 截止閥 先導閥 UDF編程 動力特性 結構設計 高效 節(jié)能

【摘要】：通用截止閥驅動往往需要龐大的執(zhí)行機構,特別是應用于高壓大口徑的管路系統(tǒng)中時,普遍存在著啟閉動作緩慢、驅動能耗高等問題。為此,本課題組研究開發(fā)了一種利用閥門內部流體流動產生的壓差作為閥門開啟動力源的新型先導式截止閥,可滿足工業(yè)高效、環(huán)保、節(jié)能的要求,具有很高的工程應用價值。但由于內部流場的復雜性和內部壓差的不確定性,新型先導式截止閥動力不確定,從而導致其結構的設計存在盲目性。本文結合Fluent的UDF技術,對新型先導式截止閥進行數值模擬,總結出此閥門的動力特性并進行實驗驗證。主要研究內容和研究成果如下： (1)針對新型先導式截止閥結構設計盲目性的問題,分析了此閥門通用部分與專用部分設計過程,找出其中存在的人為假設因素,指出解決問題的切入點在于活塞式閥芯底部上下表面間的壓差。 (2)簡化并建立了新型先導式截止閥三維模型,運用RNG k-ε紊流模型進行了數值模擬,指出閥芯底部上下表面的壓差產生的壓差力為閥門開啟的唯一動力源。同時找出了影響壓差大小的因素,為閥門動力特性的研究指明了方向。 (3)數值分析結果顯示,產生壓差力的兩個面上,壓力分布不均,編制了UDF程序分別循環(huán)提取面上每一個單元的壓強,求其平均值并輸出,得到活塞式閥芯底部上下表面的壓差值并進行網格無關性驗證,得到了壓差的網格無關解。 (4)對不同因素組合的先導式截止閥進行了數值分析與實驗研究。得到了壓差隨各因素變化情況,并結合流體力學局部阻力損失理論,擬合得到了局部阻力損失系數的工程估算公式以及動力的工程估算公式；按正交試驗方法進行實驗研究,利用位移傳感器測量閥門達到穩(wěn)定的開啟狀態(tài)時的開度,計算對應的活塞式閥芯底部上下表面壓差的實驗值,將實驗值與相應開度模型下壓差的模擬值進行對比,從而驗證了本文的模型簡化方法與數值計算方法的有效性。 本文研究成果對于新型先導式截止閥的優(yōu)化設計和工程應用具有重要的學術和應用價值。
[Abstract]:The drive of universal globe valve usually needs a huge actuator, especially when it is used in high pressure and large caliber pipeline system, there are many problems such as slow opening and closing, high driving energy consumption and so on. A new type of pilot valve is developed, which uses the pressure difference produced by the fluid flow inside the valve as the power source of valve opening. It can meet the requirements of industrial efficiency, environmental protection and energy saving. But because of the complexity of internal flow field and the uncertainty of internal pressure difference, the dynamics of the new pilot globe valve is uncertain. Therefore, the design of its structure is blind. In this paper, combined with the UDF technology of Fluent, the numerical simulation of a new type of pilot globe valve is carried out. The dynamic characteristics of the valve are summarized and verified by experiments. The main research contents and results are as follows: In order to solve the problem of blindness in the structural design of the new pilot globe valve, the design process of the universal and special parts of the valve is analyzed, and the artificial hypothetical factors are found out. It is pointed out that the key to solve the problem lies in the pressure difference between the upper and lower surfaces of the piston spool. The three-dimensional model of a new pilot valve is simplified and established, and the numerical simulation is carried out by using the RNG k- 蔚 turbulence model. It is pointed out that the pressure differential force caused by the pressure difference between the upper and lower surfaces of the bottom of the valve core is the only power source for the valve to open, and the factors influencing the pressure difference are found out, which points out the direction for the study of the dynamic characteristics of the valve. The results of numerical analysis show that the pressure distribution is uneven on the two planes where the pressure difference force is generated. The UDF program is compiled to separate cycles to extract the pressure of each unit on the surface and to find the average value and output. The pressure difference between upper and lower surface of the piston valve core is obtained and the mesh independence is verified and the mesh independent solution of the pressure difference is obtained. 4) numerical analysis and experimental study of pilot valve with different combination of factors are carried out. The pressure difference varies with each factor, and combined with the theory of local resistance loss in fluid mechanics. The engineering estimation formula of local resistance loss coefficient and the engineering estimation formula of dynamic force are obtained by fitting. According to the orthogonal test method, the displacement sensor is used to measure the opening of the valve to reach a stable opening state, and to calculate the corresponding experimental value of the pressure difference between the bottom of the piston valve core and the upper and lower surface. The experimental results are compared with the simulated values of the pressure difference under the corresponding opening model, which verifies the effectiveness of the simplified model and the numerical calculation method in this paper. The research results in this paper have important academic and applied value for the optimization design and engineering application of the new pilot globe valve.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH134

【參考文獻】

相關期刊論文 前10條

1 王禁非;黃曉云;;先導式高壓清水截止閥的設計[J];閥門;2006年02期

2 李軍業(yè);;閥門的流量試驗與分析[J];閥門;2010年02期

3 趙京雷;張曉偉;;200MW汽輪機閥門特性曲線優(yōu)化[J];華北電力技術;2008年05期

4 伍悅濱;曲世琳;張維佳;趙洪賓;;給水管網中閥門阻力實驗研究[J];哈爾濱工業(yè)大學學報;2003年11期

5 李卓;俞堅;馬重芳;;小通道單相流體突擴和突縮局部阻力特性[J];化工學報;2007年05期

6 薛永飛;車福亮;王迎輝;陳愛東;;有壓管路中閥門關閉特性的數值研究[J];河南工程學院學報(自然科學版);2009年03期

7 宋銀立;;中國閥門行業(yè)發(fā)展概述[J];機械工業(yè)標準化與質量;2009年09期

8 王樹杰;趙龍武;李冬;;基于動網格技術帆板搖帆空氣動力特性分析[J];空氣動力學學報;2009年04期

9 常玉連;李振海;高勝;肖易平;劉啟蒙;詹冠杰;;彈簧勁度系數對單向閥開啟過程的影響仿真研究[J];科學技術與工程;2010年14期

10 曲世琳,伍悅濱,趙洪賓;閥門在給水管網系統(tǒng)中流量調節(jié)特性的研究[J];流體機械;2003年11期

，

本文編號：1428549