基于Fluent的KT-400油扩散泵设计及优化
发布时间：2018-11-28 12:21
【摘要】：油扩散泵是目前用来获得高真空的工具之一,其应用领域较为广泛。它具有成本低,结构简单、制造容易、无机械传动、无振动、无噪声、操作方便、便于维护、寿命长等特点。油扩散泵的抽气速率和返油率是反应油扩散泵工作性能的重要指标,而如何提高油扩散泵的抽气速率和降低返油率一直是相关研究单位关注的重点。一般来说,在结构上影响扩散泵抽速的因素主要是喷嘴直径、喷嘴喉部间隙、各级间距、腔体形状等。本文通过对KT-400油扩散泵的设计计算初步确定了油扩散泵的结构尺寸,利用Solidworks进行三维建模并使用计算流体力学的软件Fluent对喷嘴结构、张角角度、喉部间隙和各级的级间间距进行数值模拟并加以优化,同时也对挡油帽、挡油环和凸腔腔体对蒸汽射流的影响做了数值模拟。通过数值模拟结果得出,喷嘴的结构可以影响被喷出的蒸汽射流的速度;喷嘴张角越大蒸汽射流速度越大;喉部间隙越小蒸汽射流速度越大;各级间间距是存在最优值的;各级间间距越大,从一级喷嘴喷射出的蒸汽射流速度越小;级间间距过小,各级喷出的蒸汽射流将会相互干扰;挡油帽和挡油环可以有效的阻止蒸汽的返流;凸腔泵的返油率要低于直腔泵。
[Abstract]:Oil diffuser pump is one of the tools used to obtain high vacuum, and it is widely used in many fields. It has the advantages of low cost, simple structure, easy manufacture, no mechanical transmission, no vibration, no noise, convenient operation, easy maintenance and long life. The pumping rate and the oil return rate of the oil diffuser pump are the important indexes of the performance of the reaction oil diffusion pump, and how to improve the pumping rate and reduce the oil return rate of the oil diffusion pump has been the focus of the relevant research units. Generally speaking, the main factors affecting the pumping speed of the diffuser pump are nozzle diameter, nozzle throat clearance, space between different levels, cavity shape and so on. Based on the design and calculation of KT-400 oil diffuser pump, the structure dimension of oil diffuser pump is preliminarily determined. The three-dimensional modeling is carried out by using Solidworks, and the nozzle structure and angle are obtained by using the computational fluid dynamics software Fluent. At the same time, the effects of cap, ring and cavity on the steam jet are simulated numerically and optimized. The results of numerical simulation show that the structure of the nozzle can affect the velocity of the steam jet, the larger the nozzle angle, the greater the velocity of steam jet, the smaller the throat clearance, the greater the velocity of steam jet. The larger the distance between the different levels, the smaller the velocity of steam jet ejected from the first stage nozzle, the smaller the interval between stages, the interference between the steam jet of each stage, the effective prevention of steam reflux by the cap and ring; The oil return rate of convex cavity pump is lower than that of straight cavity pump.
【学位授予单位】：哈尔滨商业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB752.42
本文编号：2362803
[Abstract]:Oil diffuser pump is one of the tools used to obtain high vacuum, and it is widely used in many fields. It has the advantages of low cost, simple structure, easy manufacture, no mechanical transmission, no vibration, no noise, convenient operation, easy maintenance and long life. The pumping rate and the oil return rate of the oil diffuser pump are the important indexes of the performance of the reaction oil diffusion pump, and how to improve the pumping rate and reduce the oil return rate of the oil diffusion pump has been the focus of the relevant research units. Generally speaking, the main factors affecting the pumping speed of the diffuser pump are nozzle diameter, nozzle throat clearance, space between different levels, cavity shape and so on. Based on the design and calculation of KT-400 oil diffuser pump, the structure dimension of oil diffuser pump is preliminarily determined. The three-dimensional modeling is carried out by using Solidworks, and the nozzle structure and angle are obtained by using the computational fluid dynamics software Fluent. At the same time, the effects of cap, ring and cavity on the steam jet are simulated numerically and optimized. The results of numerical simulation show that the structure of the nozzle can affect the velocity of the steam jet, the larger the nozzle angle, the greater the velocity of steam jet, the smaller the throat clearance, the greater the velocity of steam jet. The larger the distance between the different levels, the smaller the velocity of steam jet ejected from the first stage nozzle, the smaller the interval between stages, the interference between the steam jet of each stage, the effective prevention of steam reflux by the cap and ring; The oil return rate of convex cavity pump is lower than that of straight cavity pump.
【学位授予单位】：哈尔滨商业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB752.42
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