基于动网格技术的端面造型机械密封性能  

Sealing performance of mechanical seals with various end faces using dynamic mesh technique

作　　者：陈汇龙[1] 李雯瑜[1] 吴荣珍[1] 林清龙[1] 黄建平[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《排灌机械工程学报》2012年第1期107-111,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省自然科学基金资助项目(BK2007095);江苏高校优势学科建设工程资助项目(苏财教[2011]8号)

摘　　要：利用Fluent软件中的动网格技术,将其应用于机械密封间隙内流场数值模拟中,以有效解决模拟过程中液膜厚度无法预知的问题,获得更加贴近实际的内流场特性,并在此基础上对普通机械密封、微孔端面机械密封、孔槽耦合端面机械密封进行内流场模拟研究,得到3种方案下压力分布、剪切应力分布和泄漏量,对模拟结果进行比较分析.结果表明:动网格技术在机械密封内流场模拟中的应用是可行的,能得到更好的效果;微孔和螺旋泵送槽都能够产生动压效应,其中由于微孔的动压效应产生的高压区出现在渐缩截面处,槽的动压效应产生的高压区主要出现在槽末端台阶处;与普通机械密封相比,微孔端面机械密封能够产生动压效应,减轻密封件的摩擦磨损,但防泄漏性能不佳;孔槽耦合端面机械密封运行时不仅剪切应力小,而且能有效抵抗压差流、降低泄漏量,具备优异的密封润滑性能,是获得零泄漏非接触高性能的可行途径.Dynamic mesh technique in Fluent is used to simulate the film flow between two rings of mechanical seal.By this method the unknown thickness of film flow can be obtained so that the flow field in the film more resembles to that in the real situation.Then,the pressure,wall shear stress and leakage rate were estimated and compared among the mechanical seals with usual flat,micro-pore and micro-pore-spiral groove end faces,respectively.The results turned out that both the micro-pore and spiral groove can produce dynamic pressure effect.The high pressure region appears in the tapered section of the micro-pore end face,for the spiral groove face,the high pressure region locates at the step behind the groove trailing edge instead.Compared with the usual mechanical seal,the micro-pore mechanical seal can generate sufficient dynamic pressure and be subject to less frictional wear,but a relative larger leakage rate.However,the micro-pore-spiral groove mechanical seal not only has less frictional wear but smaller leakage and an excellent lubrication characteristic.As a result,the micro-pore-spiral groove mechanical seal maybe provide a feasible way to get a high sealing and non-contacting performance with zero leakage.

关 键 词：机械密封性能 动网格模型 端面 内流场 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] TH136[农业科学—农业工程]