考虑填料密封的螺旋密封数值模拟

发布时间：2018-09-13 06:05

【摘要】：螺旋密封在工业生产和日常生活中被广泛的应用，在使用时往往需要和填料密封一起配合使用，研究两者之间相互关系对工程实际应用具有重要的指导意义。本文通过利用多孔介质概念来类比填料密封泄漏的机理，建立相应的计算模型，对填料密封和螺旋密封共同作用下的气体密封问题做了计算流体力学数值模拟，并研究了两者之间的关系。详细工作分以下六部分展开：第一章，阐述了该课题的研究背景和意义，综述了螺旋密封和多孔介质研究现状，提出了本文的研究方法，同时概括了本文的主要研究内容。第二章，详细介绍了密封种类和多孔介质，并讨论了螺旋密封和多孔介质相关理论。第三章，介绍了网格的基本类型及网格生成方法和网格生成过程，分析了近壁面网格处理。叙述了螺旋密封配合填料密封的工况和各个几何尺寸，针对螺旋密封的不同位置，，进行了不同类型的网格生成，对螺旋槽采用近似处理建立了高质量的六面体网格，间隙处生成混合网格，最后建立了高质量的全流道网格。第四章，介绍了CFD数值模拟的基本过程。叙述了基本的流体控制方程、湍流模型和多孔介质模型，采用SST模型对螺旋密封配合填料密封进行了数值计算，分析了流道的速度场和压力场。通过对比阐述了螺旋密封正反转的重要性。计算分析了填料密封渗透率对密封性能的影响。第五章，对不同结构的螺旋密封配合填料密封进行了计算，分别研究了螺旋密封的螺旋角、槽深间隙比和间隙对填料密封渗透率取值的影响。计算了不同压强及不同轴转速下填料密封渗透率的取值，并分析了两者之间的关系。第六章，对本文的工作进行了总结，指出本文工作中的不足和创新之处。
[Abstract]:Spiral seal is widely used in industrial production and daily life, and it is often used in conjunction with packing seal. It is of great significance to study the relationship between them in practical application. By using the concept of porous medium to simulate the leakage mechanism of packing seal, the corresponding calculation model is established, and the numerical simulation of gas seal under the joint action of packing seal and spiral seal is made. The relationship between them is studied. The detailed work is divided into the following six parts: the first chapter describes the research background and significance of the subject, summarizes the research status of spiral seal and porous media, and puts forward the research methods of this paper. At the same time, the main research contents of this paper are summarized. In the second chapter, the types of sealing and porous media are introduced in detail, and the theory of spiral seal and porous media is discussed. In the third chapter, the basic types of grid, the method of grid generation and the process of grid generation are introduced, and the processing of near wall mesh is analyzed. The working conditions and geometric dimensions of spiral seal with packing seal are described. According to the different positions of spiral seal, different types of mesh are generated, and a high quality hexahedron mesh is established by approximate treatment of spiral groove. A hybrid mesh is generated at the gap, and a high quality full channel mesh is established. In chapter 4, the basic process of CFD numerical simulation is introduced. The basic fluid control equation, turbulence model and porous media model are described. The SST model is used to numerically calculate the screw seal with packing seal, and the velocity field and pressure field of the flow channel are analyzed. The importance of positive and reverse rotation of spiral seal is expounded by comparison. The effect of packing seal permeability on sealing performance was calculated and analyzed. In the fifth chapter, the helical angle, the ratio of groove depth to clearance and the effect of clearance on the permeability of packing seal are studied. The permeability of packing seal under different pressure and axial speed is calculated and the relationship between them is analyzed. The sixth chapter summarizes the work of this paper, points out the shortcomings and innovations in this work.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB42

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