气体热黏效应对干气密封性能影响的数值分析  

Numerical Analysis of Gas Thermal Viscosity Effect on Performance of a Spiral-Groove Gas Face Seal

作　　者：许静[1] 彭旭东[1,2] 白少先[1,2] 孟祥铠[1,2] 李纪云[1,2] 

机构地区：[1]浙江工业大学机械工程学院,杭州310032 [2]浙江工业大学过程装备及其再制造教育部工程研究中心,杭州310032

出　　处：《上海交通大学学报》2012年第5期722-728,共7页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(50805130;51175470);教育部高等学校博士学科点专项科研基金(20103317110002);浙江省自然科学杰出青年基金(R1090833);浙江省自然科学基金(Y1090620)资助项目

摘　　要：基于气体多变过程理论和气体润滑理论,通过对雷诺方程的多变指数进行修正,建立了分析螺旋槽干气密封热黏效应的数学模型.采用有限元法对黏度对于干气密封性能的影响进行数值分析.结果表明多变指数和黏度越大、压力和温度越高,则干气密封的端面气膜承载能力越强;在高速或中、高压工况下,需考虑气体热黏效应对干气密封性能的影响;当端面平均气膜厚度大于2μm时,气体热黏效应对干气密封性能参数与气膜厚度关系的影响可以忽略不计.The modified Reynolds equation was presented based on the theories of both gas polytrophic process and gas lubrication so as to study the thermal viscosity effect of gas on seal performance of a spiral- grooved dry gas seal （S-DGS）. The finite element method was used to solve the governing equations and analyze the influence of thermal-viscosity on the dry gas seal sealing performance. The results show that due to the high polytrophic exponent, the greater the values of gas film pressure, gas film temperature and gas film viscosity, the stronger the loading capacity of gas film. When an S DGS is operating at high speed or at medial or high pressures of sealed gas, the thermal viscosity effect should be considered to get more accurate simulation values of seal performance. The variations of seal performance with film thickness would not be affected by thermal-viscosity effect when film thickness is greater than two micrometer.

关 键 词：螺旋槽干气密封 多变指数 热黏效应 有限元法 

分 类 号：TH138[机械工程—机械制造及自动化]