基于CFD的T形槽气膜密封网格无关性分析
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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 UG. 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.
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 UG. 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.
引文
[1]MILLER B A,GREEN I.Semi-analytical dynamic analysis of spiral groove mechanical gas face seals[J].Tribology International,2003,125:404-413.
[2]ALEXANDR K,VLADIMIR D.Experimental investigation dry gas dynamic seals used for gas compressor unit[J].Procedia Engineering,2012,39:379-386.
[3]王玉明,刘伟,刘莹.非接触式机械密封基础研究现状与展望[J].液压气动与密封,2011,31(2):29-33.WANG Y M,LIU W,LIU Y.Current research and developing trends on non-contacting mechanical seals[J].Hydraulics Pneumatics&Seals,2011,31(2):29-33.
[4]宋鹏云,张帅.滑移流影响螺旋槽干气密封性能的解析法[J].排灌机械工程学报,2014,32(10):877-882.SONG P Y,ZHANG S.An approximately analytical method of characteristics of spiral groove dry gas seals under slip flow conditions[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(10):877-882.
[5]唐丽.螺旋槽干气密封气膜稳态特性有限元分析[D].乌鲁木齐:新疆大学,2012.
[6]BLASIAK S.An analytical approach to heat transfer and thermal distortions in non-contacting face seals[J].International Journal of Heat and Mass Transfer,2015,81:90-102.
[7]王衍,孙见君,马晨波,等.改良T型槽干气密封多参数CFD数值分析[J].中南大学学报(自然科学版),2014,45(6):1834-1840.WANG Y,SUN J J,MA C B,et al.Multiparameter CFD numerical analysis of improved T-groove dry gas seal[J].Journal of Central South University(Science and Technology),2014,45(6):1834-1840.
[8]王衍,孙见君,陶凯,等.T形槽干气密封数值分析及槽型优化[J].摩擦学学报,2014,34(4):420-427.WANG Y,SUN J J,TAO K,et al.Numerical analysis of T-groove dry gas seal and groove optimization[J].Tribology,2014,34(4):420-427.
[9]丁雪兴,张鹏高,黄义仿,等.螺旋槽干气密封微间隙流场的CFD数值模拟[J].化工机械,2008,36(5):287-290.DING X X,ZHANG P G,HUANG Y F,et al.Numerical simulation of computational fluid dynamics(CFD)of the micro-scale flow field in the spiral groove dry gas seals[J].Chemical Engineering&Machinery,2008,36(5):287-290.
[10]宋鹏云,胡晓鹏,许恒杰.实际气体对T槽干气密封动态特性的影响[J].化工学报,2014,65(4):1344-1352.SONG P Y,HU X P,XU H J.Effect of real gas on dynamic performance of T-groove dry gas seal[J].CIESC Journal,2014,65(4):1344-1352.
[11]胡文绩,陈秀琴,余向东.T型槽干气密封端面流场的数值模拟[J].润滑与密封,2008,33(11):20-23.HU W J,CHEN X Q,YU X D.Numerical simulation of face flow field on T-shape groove dry gas seal[J].Lubrication Engineering,2008,33(11):20-23.
[12]SHAHIN I,GADALA M,ALQARADAWI M,et al.Three dimensional computational study for spiral dry gas seal with constant groove depth and different tapered grooves[J].Procedia Engineering,2013,68:205-212.
[13]吴波,陈志,李建明,等.基于CFD正交试验的螺旋槽干气密封性能仿真研究[J].流体机械,2014,24(1):11-16.WU B,CHEN Z,LI J M,et al.Numerical simulation research on the sealing performance of spiral groove dry gas seal by orthogonal experiments based on CFD method[J].Fluid Machinery,2014,24(1):11-16.
[14]简元霞,朱维兵,王建.基于ANSYS workbench的T型槽干气密封流场分析[J].润滑与密封,2015,40(4):79-81.JIAN Y X,ZHU W B,WANG J.Analysis on T-groove dry gas seal flow field based on ANSYS workbench[J].Lubrication Engineering,2015,40(4):79-81.
[2]ALEXANDR K,VLADIMIR D.Experimental investigation dry gas dynamic seals used for gas compressor unit[J].Procedia Engineering,2012,39:379-386.
[3]王玉明,刘伟,刘莹.非接触式机械密封基础研究现状与展望[J].液压气动与密封,2011,31(2):29-33.WANG Y M,LIU W,LIU Y.Current research and developing trends on non-contacting mechanical seals[J].Hydraulics Pneumatics&Seals,2011,31(2):29-33.
[4]宋鹏云,张帅.滑移流影响螺旋槽干气密封性能的解析法[J].排灌机械工程学报,2014,32(10):877-882.SONG P Y,ZHANG S.An approximately analytical method of characteristics of spiral groove dry gas seals under slip flow conditions[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(10):877-882.
[5]唐丽.螺旋槽干气密封气膜稳态特性有限元分析[D].乌鲁木齐:新疆大学,2012.
[6]BLASIAK S.An analytical approach to heat transfer and thermal distortions in non-contacting face seals[J].International Journal of Heat and Mass Transfer,2015,81:90-102.
[7]王衍,孙见君,马晨波,等.改良T型槽干气密封多参数CFD数值分析[J].中南大学学报(自然科学版),2014,45(6):1834-1840.WANG Y,SUN J J,MA C B,et al.Multiparameter CFD numerical analysis of improved T-groove dry gas seal[J].Journal of Central South University(Science and Technology),2014,45(6):1834-1840.
[8]王衍,孙见君,陶凯,等.T形槽干气密封数值分析及槽型优化[J].摩擦学学报,2014,34(4):420-427.WANG Y,SUN J J,TAO K,et al.Numerical analysis of T-groove dry gas seal and groove optimization[J].Tribology,2014,34(4):420-427.
[9]丁雪兴,张鹏高,黄义仿,等.螺旋槽干气密封微间隙流场的CFD数值模拟[J].化工机械,2008,36(5):287-290.DING X X,ZHANG P G,HUANG Y F,et al.Numerical simulation of computational fluid dynamics(CFD)of the micro-scale flow field in the spiral groove dry gas seals[J].Chemical Engineering&Machinery,2008,36(5):287-290.
[10]宋鹏云,胡晓鹏,许恒杰.实际气体对T槽干气密封动态特性的影响[J].化工学报,2014,65(4):1344-1352.SONG P Y,HU X P,XU H J.Effect of real gas on dynamic performance of T-groove dry gas seal[J].CIESC Journal,2014,65(4):1344-1352.
[11]胡文绩,陈秀琴,余向东.T型槽干气密封端面流场的数值模拟[J].润滑与密封,2008,33(11):20-23.HU W J,CHEN X Q,YU X D.Numerical simulation of face flow field on T-shape groove dry gas seal[J].Lubrication Engineering,2008,33(11):20-23.
[12]SHAHIN I,GADALA M,ALQARADAWI M,et al.Three dimensional computational study for spiral dry gas seal with constant groove depth and different tapered grooves[J].Procedia Engineering,2013,68:205-212.
[13]吴波,陈志,李建明,等.基于CFD正交试验的螺旋槽干气密封性能仿真研究[J].流体机械,2014,24(1):11-16.WU B,CHEN Z,LI J M,et al.Numerical simulation research on the sealing performance of spiral groove dry gas seal by orthogonal experiments based on CFD method[J].Fluid Machinery,2014,24(1):11-16.
[14]简元霞,朱维兵,王建.基于ANSYS workbench的T型槽干气密封流场分析[J].润滑与密封,2015,40(4):79-81.JIAN Y X,ZHU W B,WANG J.Analysis on T-groove dry gas seal flow field based on ANSYS workbench[J].Lubrication Engineering,2015,40(4):79-81.