基于CFD的蝶阀结构优化与多场耦合分析

发布时间：2018-12-29 20:35

【摘要】：阀门作为工业发展中一个不可缺少的部分,已经成为衡量一个国家生产水平的标志,阀门产业的发展逐渐向着大容量、高参数、高要求、多效用以及自动化方向发展。传统的阀门设计方法已经不能促进阀门产业的快速发展,计算机辅助设计将成为阀门设计发展的必然。本文主要通过CFD相关理论,由介质对阀门的影响出发,使用流体分析软件Fluent、有限元分析软件ANSYS进行阀门的结构、强度等一系列分析,实现阀门设计的智能化。 (1)首先通过已有阀门实验数据与仿真数据的对比,确定了一套适合连杆蝶阀分析的仿真模型,为本文后续分析提供了依据。 (2)利用验证模型对该连杆蝶阀进行结构、强度和流态分析,获得大部分阀门的实验数据以及所需要的参数,根据所得的数据结果,提出了结构优化的方案,并提出阀门操作存在的弊端。 (3)对阀门进行结构优化,建立优化后的连杆蝶阀模型,通过改进前后对比,发现改进后的蝶阀无论在功能上,还是在结构上都比原蝶阀要好,证明了通过流体分析对蝶阀进行的优化是合理的。 (4)对连杆蝶阀进行多场耦合分析,提出了蝶阀研究的新方法,验证了改进后蝶阀在受到介质压力时变形量远远小于改进前模型。 (5)对阀门的失效形式——汽蚀进行了深入研究,从产生根源,到发展过程,最终到其所造成的破坏等,都进行了详尽的分析,其中使用了数学模型、流体仿真等多种方法,给出了避免汽蚀的方法。本文从CFD入手,通过多种方法对阀门进行刚度、强度、流阻、流态等多方面的分析,解决了阀门实验的巨大耗资问题,并且深入研究了阀门的失效形式,使阀门设计从传统的经验设计过渡到现代的智能设计。
[Abstract]:As an indispensable part of industrial development, valve has become a symbol to measure the production level of a country. The development of valve industry is gradually towards the direction of large capacity, high parameters, high requirements, multi-utility and automation. Traditional valve design method can not promote the rapid development of valve industry, computer aided design will become the inevitable development of valve design. Based on the theory of CFD and the influence of the medium on the valve, this paper uses the fluid analysis software Fluent, finite element analysis software ANSYS to analyze the structure and strength of the valve, so as to realize the intelligent design of the valve. The main contents are as follows: (1) by comparing the existing valve experimental data with the simulation data, a set of simulation model suitable for the analysis of the connecting rod butterfly valve is established, which provides the basis for the subsequent analysis of this paper. (2) the structure, strength and flow state of the connecting rod butterfly valve are analyzed by using the verification model. The experimental data of most valves and the required parameters are obtained. According to the obtained data, the scheme of structure optimization is proposed. The disadvantages of valve operation are also put forward. (3) optimize the structure of valve, establish the model of optimized connecting rod butterfly valve, and find that the improved butterfly valve is better than the original butterfly valve in function and structure by comparing before and after improvement. It is proved that the optimization of butterfly valve by fluid analysis is reasonable. (4) Multi-field coupling analysis of connecting rod butterfly valve is carried out, and a new method of butterfly valve research is put forward, which verifies that the modified butterfly valve is much smaller than the modified model when it is subjected to medium pressure. (5) the failure form of valve, cavitation, has been deeply studied, from the origin, to the development process, and finally to the damage caused by the valve, the mathematical model, fluid simulation and many other methods have been used. The method of avoiding cavitation is given. Starting with CFD, this paper analyzes the stiffness, strength, flow resistance and flow state of the valve by a variety of methods, solves the huge cost problem of the valve experiment, and deeply studies the failure form of the valve. Make valve design transition from traditional experience design to modern intelligent design.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134

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