本文選題：蝶閥 + 變徑安裝　； 參考：《浙江大學(xué)》2011年碩士論文

【摘要】：在工業(yè)領(lǐng)域和民用設(shè)施中,我們到處都能看到流體管路水循環(huán)系統(tǒng)的應(yīng)用。在工業(yè)領(lǐng)域如鋼鐵、煤礦、石油、化工、電力等都離不開(kāi)水循環(huán)系統(tǒng)；而民用領(lǐng)域如樓宇中央空調(diào)系統(tǒng)、小區(qū)集中供熱等更是典型的水循環(huán)系統(tǒng)。面向流體管網(wǎng)輸配節(jié)能的研究,其中閥門(mén)是最關(guān)鍵的控制部件。因此控制閥的設(shè)計(jì)開(kāi)發(fā)具有十分重大的意義。 本文主要針對(duì)蝶閥在流體管路水循環(huán)系統(tǒng)中的工程應(yīng)用展開(kāi)研究,內(nèi)容主要包括變徑安裝對(duì)蝶閥流量系數(shù)的影響、蝶閥的相似性準(zhǔn)則設(shè)計(jì)兩個(gè)方面,并采取理論分析、數(shù)值計(jì)算和實(shí)驗(yàn)研究相結(jié)合的方法,結(jié)果表明文章所提出的方法可行。 第一部分：變徑安裝對(duì)蝶閥流量系數(shù)的影響研究。在實(shí)際工程應(yīng)用中,閥門(mén)經(jīng)常被變徑安裝,而伴隨變徑安裝往往會(huì)出現(xiàn)閥門(mén)實(shí)際通流能力低于閥門(mén)標(biāo)稱(chēng)通流能力的現(xiàn)象。本文應(yīng)用CFD方法中的SIMPLE算法,對(duì)DN125蝶閥的四種不同管徑的安裝方式進(jìn)行了數(shù)值計(jì)算,求得各自的Kvs值。并以計(jì)算結(jié)果為樣本,提出了變徑安裝的二次修正函數(shù)方法。 第二部分：蝶閥的相似性準(zhǔn)則設(shè)計(jì)開(kāi)發(fā)。針對(duì)大口徑控制蝶閥缺少設(shè)計(jì)方法的現(xiàn)狀,利用流體機(jī)械的相似性原理創(chuàng)新提出相似設(shè)計(jì)方法,闡述了相似準(zhǔn)則并確定相似準(zhǔn)則在閥門(mén)設(shè)計(jì)中的可行性,確定了歐拉相似為保證動(dòng)力相似的決定性條件。本文首先設(shè)計(jì)出具有線性流量特性的DN40蝶閥模型,并用SIMPLE算法對(duì)模型在不同開(kāi)度狀態(tài)的流量系數(shù)進(jìn)行了數(shù)值計(jì)算,得到其流量特性。根據(jù)歐拉相似準(zhǔn)則設(shè)計(jì)出原型DN200蝶閥,同樣利用CFD方法中的SIMPLE算法,對(duì)原型在不同開(kāi)度下?tīng)顟B(tài)進(jìn)行數(shù)值計(jì)算,得出其流量特性,以原型流量特性的線性度來(lái)考察相似設(shè)計(jì)方法的可行性。計(jì)算結(jié)果表明：原型流量特性有較好的線性度,設(shè)計(jì)方法可行。文章設(shè)計(jì)了專(zhuān)門(mén)實(shí)驗(yàn)測(cè)試平臺(tái)對(duì)計(jì)算結(jié)果進(jìn)行了實(shí)驗(yàn)驗(yàn)證,實(shí)驗(yàn)結(jié)果表明DN200蝶閥具有理想的線性流量特性,相似性準(zhǔn)則設(shè)計(jì)方法可靠。
[Abstract]:In the industrial field and in civil facilities, we can see the application of water circulation system of fluid pipeline everywhere. In the industrial fields such as iron and steel, coal, petroleum, chemical, electric power and so on are inseparable from the water circulation system; but the civil field such as the building central air conditioning system, the district central heating and so on is the typical water circulation system. The valve is the most important control component in the research of energy saving in fluid pipeline network. Therefore, the design and development of the control valve is of great significance. This paper mainly focuses on the engineering application of butterfly valve in the water circulation system of fluid pipeline, including the influence of variable diameter installation on the flow coefficient of butterfly valve, the design of similarity criterion of butterfly valve, and the theoretical analysis. The results show that the proposed method is feasible. The first part: the influence of variable diameter installation on the flow coefficient of butterfly valve. In the practical engineering application, the valve is often installed with variable diameter, and the phenomenon that the actual flow capacity of valve is lower than the nominal capacity of valve is often appeared with variable diameter installation. In this paper, the simple algorithm of CFD method is used to calculate the installation modes of four different pipe diameters of DN125 butterfly valve, and their respective Kvs values are obtained. Based on the calculation results, a quadratic correction function method for variable diameter installation is proposed. The second part: design and development of the similarity criterion of butterfly valve. In view of the lack of design method for large caliber control butterfly valve, the similarity design method is innovated by using the similarity principle of fluid machinery, and the similarity criterion is expounded and the feasibility of similarity criterion in valve design is determined. Euler similarity is determined as the decisive condition to ensure dynamic similarity. In this paper, a DN40 butterfly valve model with linear flow characteristics is designed, and the flow coefficient of the model in different opening states is numerically calculated by simple algorithm, and the flow characteristics of the model are obtained. The prototype DN200 butterfly valve is designed according to the Euler similarity criterion, and the flow characteristics of the prototype are obtained by using simple algorithm of CFD method. The feasibility of the similar design method is investigated by the linearity of the flow characteristics of the prototype. The calculation results show that the prototype flow characteristic has good linearity and the design method is feasible. A special experimental test platform is designed to verify the calculation results. The experimental results show that the DN200 butterfly valve has ideal linear flow characteristics and the design method of similarity criterion is reliable.
【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(lèi)號(hào)】：TH134

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