基于FLUENT的液压破碎锤泄漏量计算

机械设计制造及其自动化论文，论文编号:JX1182  论文字数:19062.页数:41

摘    要
 液压破碎锤是一种由液压能转化为机械冲击能的破碎机具，以液体压力驱动活塞往复运动做功，对外输出能量进行工作。广泛应用于国防施工、公路和铁路建设、市政工程等行业。本文主要研究液压破碎锤中的迷宫密封流量场。
 研究的主要内容是建立迷宫密封三维CFD数学模型，应用当前国内流通的CFD软件Fluent模拟分析以及计算液压破碎锤迷宫密封流场以，计算不同情况下液体的泄漏量。分析出了迷宫密封几何尺寸、齿尖形状、转速、偏心等因素对泄漏量的影响规律，对密封结构进行优化，改善了迷宫密封的密封性能。
 第一章，首先介绍了液压破碎锤的应用和概况，及目前迷宫密封课题研究的意义和迷宫密封模拟及数值计算的研究现状国内外文献综述，及本课题所进行工作和内容。
 第二章，简要介绍了计算流体力学与fluent软件，及其在仿真流体流动情况方面的广泛应用。
 第三章，主要介绍本文研究所应用的模型建立方法和过程。首先是介绍湍流模型和SIMPLE算法。然后以图文对照的方式具体地描述了用gambit软件从点线面体逐步建立研究对象模型的过程，以及计算过程中的边界条件及其他条件的设置。
 第四章，对模型建立后获得的结果进行分析和比较。从截面速度、压力等方面的分析出模型的优劣。并通过对迷宫密封形状、尺寸、转速等因数对泄漏量的影响，对密封结构进行优化，改善了迷宫密封的密封性能。
 第五章，对全文内容进行了总结概括和对研究本课题方法的展望。
关键词：  破碎锤 迷宫密封 FLUENT 泄漏量     
Abstract

 Hydraulic breaking hammer is a hydraulic pressure to mechanical impact energy into the broken equipment to the liquid pressure acting reciprocating piston-driven, external work output energy. Widely used in national defense construction, road and railway construction, municipal engineering and other industries. In this paper, research hydraulic breaking hammer of the labyrinth seal flow field.    The main contents of the study is to establish three-dimensional labyrinth seal CFD mathematical model, the application of the domestic circulation of the current CFD software Fluent simulation analysis and calculation of hydraulic breaking hammer labyrinth seal to the flow field, under different volume of liquid leakage. Analysis of the geometry of the labyrinth seal teeth tip shape, speed, eccentricity and other factors on the effects of leakage, to optimize the structure of the seal, a labyrinth seal to improve sealing performance.    The first chapter introduces the application of hydraulic breaking hammer and profile and the current research labyrinth seal and labyrinth seal of the significance of numerical simulation and the research literature at home and abroad, and the subject of the work and content.     The second chapter briefly introduced and the fluent computational fluid dynamics software, and its application in the actual simulation of fluid flow of a wide range of applications     The third chapter introduces the Institute for the application of this article and the process of model building. First of all, is to introduce the turbulence model and the SIMPLE algorithm. Graphic control and then the way to describe the use of specific software gambit lines to cover the body from the point of the study model of the gradual establishment of the process, as well as the calculation of the boundary conditions and other conditions set.     Chapter IV, on the model results was analyzed and compared. From the cross-section rate, pressure and so the analysis of the merits and demerits of the model. Through the labyrinth seal of the shape, size, speed and other factors affect the amount of leakage, to optimize the structure of the seal, a labyrinth seal to improve sealing performance.     Chapter V of the full text of the speech summed up the content and methods to study the issues ahead.

Keywords：hydraulic breaking hammer；Labyrinth seal ；FLUENT； Leakage
 
目   录
摘    要 i
Abstract ii
目   录 iv
第一章  绪 论 1
1.1 液压破碎锤的发展概况 1
1.2  迷宫密封简介 2
1.3 迷宫密封流场特性研究现状 3
1.3.1 迷宫密封实验研究概况 4
1.3.2迷宫密封数值研究进展 5
1.4  课题研究的内容及意义 6
第二章 计算流体力学与FLUENT软件介绍 7
2.1计算流体力学简介 7
2.2 FLUENT软件简介 8
第三章  流量场计算模型 10
3.1  计算流体力学理论与方法 10
3.11  湍流模型简介 10
3.12   SIMPLE算法 11
3.2  模型建立及网格划分 11
3.2.1  初步建模 12
3.2.2 网格划分 18
3.2.3 计算 20
第四章  FLUENT仿真及分析 25
4.1  轴向截面速度和压力分析 25
4.2  轴向截面速度分布 26
4.3  轴向截面温度的分析 27
4.4  流体泄漏量的分析 28
第五章  总结与展望 33
致  谢 36