液压缸间隙密封流场下支承环的流固耦合分析(一)

1、液压缸间隙密封流场下支承环的流固耦合分析摘要在结晶器液压振动系统中,结晶器振动伺服液压缸的工作性能对整个连铸线的高效生产起着至关重要的作用。而影响振动液压缸工作性能最主要的因素便是液压缸中活塞及活塞杆上的密封组合。由于结晶器振动液压缸要求高频率、大负载,因此传统的橡胶密封圈组合在此工况下容易造成剧烈磨损而失效。韶关液压件厂针对此种情况,在活塞上开多条平衡槽,采用新型的非接触密封方式间隙密封,有效地避免了传统密封的缺点,使缸的质量得到了较大的提升。但是在活塞杆上导向套处,由于导向套仍采用旧有的橡胶圈密封,在高频、大负载工况下,容易磨擦发热,灼伤活塞杆镀铬层,造成严重泄漏。本文针对此种情况,设计了

2、一种新型的采用间隙密封的浮动支承环来代替原有的导向套,并应用流固耦合分析法对其进行研究分析与定型。首先,应用Gambit,Pro/E分别对间隙密封流场和支承环结构进行建模,并运用相应的网格划分工具对其进行网格划分。其次,在Workbench平台下,先运用Fluent对流场进行分析,然后将分析的结果数据导入ANSYS静力分析模块,对支承环进行结构变形分析。最后,对不同工作压力下不同厚度支承环的变形数据进行对比分析,得出最佳的间隙密封的间隙厚度及支承环厚度。本文将流固耦合分析技术引入对间隙密封流场下支承环的分析,得到了不同压力下最佳的间隙密封的间隙厚度及支承环厚度,对今后间隙密封的应用与发展及结晶

3、器振动伺服液压缸生产质量的提高有着重要的作用。关键词:液压缸,间隙密封,支承环,流固耦合,建模与仿真AbstractIn the mould hydraulic oscillation system,the working performance of the mould oscillation servo hydraulic cylinder had important influence on the highly efficient production of the continuous casting line.For the working performance,the main

4、 factors were the sealing combination on the piston and the piston rod.Because the hydraulic cylinder often works in the high frequency and big load working environment,traditional rubber sealing ring combination would cause severe wear and failure in this conditions.To address this situation,Shaogu

5、an Hydraulic Components Factory opened balanced-pressure grooves on the piston to use a new non-contact seal way-clearance seal.This method could effectively avoid the disadvantages of traditional seal,so that the quality of the cylinder got bigger promotion.But on the piston rod, the guide sleeve s

6、till used traditional rubber sealing ring.In the harsh conditions,this could cause severe friction and a lot of fever,which could burn the piston rod plating chromic layer and cause serious leakage.Based on the situation,this paper designed a new type of back-up ring with clearance seal,instead of t

7、he guide sleeve,and applied fluid-solid interaction analysis method to research it and finalize the design.Firstly,using Pro/E and Gambit to establish the model of back-up ring and flow field of gap seal.Using relevant software to mesh the model.Secondly,based on Workbench,using Fluent to analysis t

8、he flow field,then importing the results into ANSYS Mechanical APDL and using it to research the back-up ring(fluid-solid interaction analysis.Finally,compared simulation results data,this paper got the best clearance sealed clearance thickness and supporting ring thickness.The paper introduced a ne

9、w simulation method of fluid-solid interaction analysis into Hydraulic field to study the clearance seal and the solid ring,which was very important to the research of clearance seal and its application in the futureKey words:Hydraulic cylinder;Clearance seal;back-up ring;Fluid-solid interaction;Mod

10、eling and simulation目录摘要.I Abstract.II 目录.III 第一章绪论 (11.1选题背景 (11.2间隙密封的研究现状及在液压领域中的应用 (21.2.1间隙密封的国内外研究现状 (21.2.2间隙密封技术在液压领域的应用 (31.3课题的研究意义和内容 (5第二章流固耦合分析基础 (72.1流固耦合的基本定义 (72.2计算流体力学的基本方程 (72.3计算固体力学的基本方程 (82.4流固耦合方程 (92.5流固耦合的分类 (92.6流固耦合的数值模拟实现及软件介绍 (102.7ANSYS Workbench12下单向流固耦合模块组合方式 (11第三章流场

11、域的建模分析 (143.1引言 (143.2流场域的前处理 (143.2.1几何模型的建立及其网格划分 (153.2.2网格质量检查 (163.2.3边界条件类型的定义 (173.3基于fluent仿真的流场域求解 (173.3.1仿真参数设置 (173.3.2仿真计算收敛性分析 (193.4泄漏量分析 (203.4.1缝隙流动的泄漏量的理论分析 (203.4.2基于Workbench下Fluent的仿真泄漏量分析 (233.4.3基于Workbench下Fluent仿真的流场域耦合面压力分析 (243.5本章小结 (25第四章固体域耦合目标的建模分析 (264.1引言 (264.2基于Workbench ANYSY的支承环变形仿真分析 (274.2.1前处理及求解设置 (274.2.2后处理变形及应力分析 (304.3本章小结 (31第五章多种压力下不同支