蝶阀变径与相似性研究

发布时间：2018-07-07 20:59

本文选题：蝶阀 + 变径安装　；参考：《浙江大学》2011年硕士论文

【摘要】：在工业领域和民用设施中,我们到处都能看到流体管路水循环系统的应用。在工业领域如钢铁、煤矿、石油、化工、电力等都离不开水循环系统；而民用领域如楼宇中央空调系统、小区集中供热等更是典型的水循环系统。面向流体管网输配节能的研究,其中阀门是最关键的控制部件。因此控制阀的设计开发具有十分重大的意义。本文主要针对蝶阀在流体管路水循环系统中的工程应用展开研究,内容主要包括变径安装对蝶阀流量系数的影响、蝶阀的相似性准则设计两个方面,并采取理论分析、数值计算和实验研究相结合的方法,结果表明文章所提出的方法可行。第一部分：变径安装对蝶阀流量系数的影响研究。在实际工程应用中,阀门经常被变径安装,而伴随变径安装往往会出现阀门实际通流能力低于阀门标称通流能力的现象。本文应用CFD方法中的SIMPLE算法,对DN125蝶阀的四种不同管径的安装方式进行了数值计算,求得各自的Kvs值。并以计算结果为样本,提出了变径安装的二次修正函数方法。第二部分：蝶阀的相似性准则设计开发。针对大口径控制蝶阀缺少设计方法的现状,利用流体机械的相似性原理创新提出相似设计方法,阐述了相似准则并确定相似准则在阀门设计中的可行性,确定了欧拉相似为保证动力相似的决定性条件。本文首先设计出具有线性流量特性的DN40蝶阀模型,并用SIMPLE算法对模型在不同开度状态的流量系数进行了数值计算,得到其流量特性。根据欧拉相似准则设计出原型DN200蝶阀,同样利用CFD方法中的SIMPLE算法,对原型在不同开度下状态进行数值计算,得出其流量特性,以原型流量特性的线性度来考察相似设计方法的可行性。计算结果表明：原型流量特性有较好的线性度,设计方法可行。文章设计了专门实验测试平台对计算结果进行了实验验证,实验结果表明DN200蝶阀具有理想的线性流量特性,相似性准则设计方法可靠。
[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.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134

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