本文選題：先導(dǎo)式截止閥 + 啟閉流場(chǎng)特性　； 參考：《浙江大學(xué)》2011年碩士論文

【摘要】：基于先導(dǎo)控制的截止閥是一種利用介質(zhì)壓差實(shí)現(xiàn)啟閉的新型閥門,具有結(jié)構(gòu)簡(jiǎn)單、驅(qū)動(dòng)能耗低、啟閉快速等特點(diǎn)。但目前尚缺乏系統(tǒng)的理論研究、數(shù)值分析和試驗(yàn)驗(yàn)證,尤其在啟閉特性方面缺少相關(guān)研究,而啟閉特性的優(yōu)劣關(guān)系直接影響閥門整體性能的體現(xiàn),甚至影響整個(gè)管路系統(tǒng)的穩(wěn)定性和安全性。為此本文采用數(shù)值模擬和實(shí)驗(yàn)研究相結(jié)合的方法,對(duì)先導(dǎo)式截止閥的流場(chǎng)特性、閥芯受力和運(yùn)動(dòng)特性以及彈簧選型等進(jìn)行研究。主要研究?jī)?nèi)容和研究成果如下： 1、通過先導(dǎo)式截止閥的穩(wěn)態(tài)研究,初步驗(yàn)證了利用壓差啟閉原理的可行性和閥門結(jié)構(gòu)的合理性；研究了不同條件對(duì)穩(wěn)態(tài)流場(chǎng)的影響；分析了穩(wěn)態(tài)壓差液動(dòng)力,為動(dòng)態(tài)模擬奠定了基礎(chǔ)。 2、建立了閥芯受力方程和運(yùn)動(dòng)方程,并以此為依據(jù)編寫了UDF程序,使新型先導(dǎo)式截止閥的動(dòng)態(tài)模擬成為可能,為此類閥門的數(shù)值模擬奠定了基礎(chǔ)。 3、描述了先導(dǎo)式截止閥動(dòng)態(tài)啟閉過程,通過分析啟閉時(shí)閥門流場(chǎng)和閥芯受力、位移及速度隨時(shí)間的變化,對(duì)閥門的動(dòng)態(tài)啟閉過程有了更加全面和清晰的認(rèn)識(shí)；研究了不同條件對(duì)動(dòng)態(tài)啟閉流場(chǎng)特性的影響,分別總結(jié)了開啟和關(guān)閉時(shí),不同入口壓力、彈簧剛度和先導(dǎo)時(shí)間對(duì)閥門內(nèi)部流場(chǎng)變化所產(chǎn)生的規(guī)律,為先導(dǎo)式截止閥的應(yīng)用和設(shè)計(jì)具有指導(dǎo)作用；揭示了不同條件對(duì)閥芯運(yùn)動(dòng)特性的影響,分別總結(jié)了開啟和關(guān)閉時(shí),不同入口壓力、彈簧剛度和先導(dǎo)時(shí)間對(duì)閥芯運(yùn)動(dòng)過程、閥芯穩(wěn)定位移和閥芯啟閉時(shí)間的規(guī)律,為先導(dǎo)式截止閥啟閉過程的進(jìn)一步優(yōu)化奠定了基礎(chǔ)。 4、歸納了彈簧初步選型公式,并針對(duì)此公式進(jìn)行實(shí)驗(yàn)研究。一方面通過實(shí)驗(yàn)數(shù)據(jù)得到規(guī)律,驗(yàn)證了數(shù)值模擬定性分析的正確性；另一方面對(duì)比實(shí)驗(yàn)數(shù)據(jù)與模擬數(shù)據(jù),也證明了數(shù)值模擬定量分析的合理性。修正后的選型公式減少了設(shè)計(jì)時(shí)的盲目性,提高了設(shè)計(jì)的效率。 本文研究成果對(duì)基于先導(dǎo)控制的新型截止閥的優(yōu)化、設(shè)計(jì)以及工程應(yīng)用具有重要的學(xué)術(shù)意義和工程應(yīng)用價(jià)值。
[Abstract]:The globe valve based on pilot control is a new type of valve which uses the medium pressure difference to realize the opening and closing. It has the characteristics of simple structure, low driving energy consumption and fast opening and closing. However, there is a lack of systematic theoretical research, numerical analysis and experimental verification, especially in the aspects of the opening and closing characteristics, and the relationship between the opening and closing characteristics directly affects the performance of the valve as a whole. It even affects the stability and safety of the whole pipeline system. In this paper, numerical simulation and experimental study are used to study the flow field characteristics, the force and motion characteristics of the spool and the spring selection of the pilot globe valve. The main research contents and results are as follows: 1. Through the steady-state research of pilot globe valve, the feasibility of using the principle of differential pressure opening and closing and the rationality of valve structure are preliminarily verified, the influence of different conditions on steady flow field is studied, and the steady state pressure differential fluid dynamics is analyzed. It lays a foundation for dynamic simulation. 2. The stress equation and motion equation of the valve core are established, and the UDF program is compiled on the basis of which the dynamic simulation of a new type of pilot globe valve is possible, which lays a foundation for the numerical simulation of this kind of valve. 3. The dynamic opening and closing process of pilot globe valve is described. By analyzing the change of valve flow field and valve core force, displacement and speed with time, the dynamic opening and closing process of valve has a more comprehensive and clear understanding. The effects of different conditions on the flow field characteristics of dynamic opening and closing are studied, and the rules of different inlet pressure, spring stiffness and lead time on the change of flow field in valve are summarized, respectively. It can guide the application and design of pilot globe valve, reveal the influence of different conditions on the movement characteristics of valve core, summarize the different inlet pressure, spring stiffness and lead time on the movement process of valve core when opening and closing, respectively. The steady displacement of the valve core and the opening and closing time of the valve core lay a foundation for the further optimization of the opening and closing process of the pilot globe valve. 4. The formula of spring selection is summarized, and the experimental study is carried out. On the one hand, the regularity of numerical simulation qualitative analysis is verified by experimental data; on the other hand, the rationality of numerical simulation quantitative analysis is proved by comparing experimental data with simulation data. The modified formula reduces the blindness and improves the efficiency of design. The research results of this paper have important academic significance and engineering application value for optimization, design and engineering application of new type of globe valve based on pilot control.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH134

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