轴流式止回阀阀芯线型优化分析

发布时间：2018-07-04 23:24

本文选题：轴流式止回阀 + 等强度线源与直线均匀流　；参考：《兰州理工大学》2013年硕士论文

【摘要】：自上世纪国外发明了轴流式止回阀以来,轴流式止回阀以其运行平稳、流体阻力小、水击压力小、低噪声、快速关闭、密封性能好等众多优点,在石油天然气长输管线、大型乙烯装置中的压缩机和大型泵等出口处被广泛地使用。目前国内针对轴流式止回阀阀芯与阀体流道型线的设计优化方法的相关研究较少,本课题以圆盘型轴流式止回阀为研究对象,进行流道和阀芯的流线型分析和结构优化,为轴流式止回阀的性能进一步提高提供一些参考。 (1)简要介绍了几种回转体线型的设计方法、轴流式止回阀的总体结构与工作原理以及功能,论述了阀芯型线设计原则。 (2)为了达到轴流式止回阀流体阻力小、振动与噪声小这一特点,阀瓣的型线采用等强度线源与直线均匀流叠加法设计,导流罩的型线采用精确数学表达式法来进行设计,根据这一方法对某型号的轴流式止回阀的阀芯与流道型线进行分析和优化设计,利用Pro/E5.0对原型的流道和优化计算得到的流道进行建模,应用Fluent流体分析软件对流道内的流动进行数值模拟分析。将优化前后流道内的速度、速度矢量和速度等值线在中轴面上的分布进行对比分析,结果表明：优化前的流道出现速度分布不均匀、回流、流体壅塞等现象,优化后流道内的上述现象消失了 (3)为了验证数值模拟得到的流阻系数与线型设计方法的合理性,本文对原型轴流式止回阀进行了流阻系数试验测试,将试验得到的数据与原型的数值模拟数据进行了对比分析,证明了数值模拟的正确性性。同时,将优化前和优化后的数值模拟流阻系数进行对比分析,结果表明优化后的流阻系数为1.65,与优化前的数据相比流阻系数降低了52.8%,证明了优化方法的可行性与正确性,可为设计人员提供参考。
[Abstract]:Since the invention of axial flow check valve abroad in the last century, axial flow check valve has many advantages such as smooth operation, low fluid resistance, low water hammer pressure, low noise, fast closing, good sealing performance and so on. Compressors and large pumps in large-scale ethylene plants are widely used at outlet points. At present, there are few researches on the design and optimization methods of axial flow check valve spool and valve body runner profile. This paper takes the disc type axial flow check valve as the research object, carries on the streamline analysis and the structure optimization of the flow channel and the valve core. Some references are provided for the further improvement of the performance of axial flow check valve. (1) the design methods of several kinds of rotary body line, the general structure, working principle and function of axial flow check valve are introduced briefly. The design principle of spool profile is discussed. (2) in order to achieve the characteristics of low fluid resistance and low vibration and noise of axial flow check valve, the shape line of disc is designed by equal intensity line source and linear uniform flow superposition method. The profile of the flow guide cover is designed by using the accurate mathematical expression method. According to this method, the valve core and the flow channel profile of a certain type of axial flow check valve are analyzed and optimized. Prop / E5.0 was used to model the flow channel of the prototype and the optimized flow channel, and the fluent fluid analysis software was used to simulate the flow in the channel. The distribution of velocity, velocity vector and velocity isoline in the channel before and after optimization are compared and analyzed. The results show that the velocity distribution is uneven, the flow back flow is not uniform, and the fluid is choked before the optimization. In order to verify the rationality of the flow resistance coefficient and the linear design method obtained by numerical simulation, the flow resistance coefficient of the prototype axial flow check valve is tested in this paper. The correctness of the numerical simulation is proved by comparing the experimental data with the numerical simulation data of the prototype. At the same time, the numerical simulation flow resistance coefficients before and after optimization are compared and analyzed. The results show that the optimized flow resistance coefficient is 1.65, compared with the data before optimization, the flow resistance coefficient is reduced by 52.8 percent, which proves the feasibility and correctness of the optimization method. It can provide reference for designers.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH134

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