基于CFD的T形槽气膜密封网格无关性分析  

Grid Independence Analysis of Model T-Groove Gas Film Seal Based on CFD

作　　者：王衍[1] 王达 胡琼 周宇杰 郑小清 WANG Yan;WANG Da;HU Qiong;ZHOU Yujie;ZHENG Xiaoqing(School of Mechanical Engineering,Huaihai Institute of Technology,Liangyungang Jiangsu 222005,China;Nanjing Tianyi Aviation Technology Company,Nanjing Jiangsu 210012,China)

机构地区：[1]淮海工学院机械工程学院,江苏连云港222005 [2]南京天一航空科技有限公司,江苏南京210012

出　　处：《润滑与密封》2018年第11期70-73,113,共5页Lubrication Engineering

基　　金：国家自然科学基金项目(51741504; 51805199)

摘　　要：CFD是目前研究气膜密封在多工况变参数下相关性能的高效计算方法,其中网格划分方式和数量是影响计和0. 4时的开启性能和泄漏值出现较大不合理波动,得到的密封性能参数不符合实际变化规律,在低于0. 3或高于0. 5时的结果合理、趋势稳定;网格层数变化对开启力影响较小,层数在1～5区间变化时对泄漏量影响较大,网格划分超过5层后泄漏量变化趋于稳定;基于檿檿檿檿檿檿檿算精度和效率的关键因素。以T形槽气膜密封为研究对象,建立UG三维分析模型,通过Gambit进行网格划分方式和数量的渐次变化,最终以Fluent计算结果为依据进行气膜密封网格无关性分析。结果表明:网格划分中的size参数、层数及其变化后相应的网格数量对密封性能具有较大影响; size参数取值0. 3较小的size值及5层以上的层数时,网格数量大于50万时计算得出的开启力和泄漏值变化趋势稳定。CFD is a highly efficient method for studying the correlation properties of gas film seals in multi-mode parameters.The meshing method and element number are key factors to affect the calculation accuracy and efficiency. With T-groove gas film seal as the research object, the three-dimensional model was established by UC. Meshed by gradually varying the meshing method and element number with Gambit, the results was finally solved by Fluent and which were used to analyze the grid independence.The results show that the size parameter,the layer number and its corresponding element number have a great influence on the sealing performance ; Unreasonable opening performance and leakage values appear at the size of 0.3 and 0.4,while reasonable results are obtained at the size of less than 0.3 or larger than 0.5 ;The variation of grid layer number has a little influence on the opening force, however significant on the leakage at the range of 1-5,but steady over 5 ;With smaller sizes and over 5 layers, the opening force and leakage tend to be stable when the number of grid quantity is greater than 500,000.

关 键 词：气膜密封 数值模拟 网格 无关性 

分 类 号：TH117[机械工程—机械设计及理论]