不同引流槽对T型槽干式密封性能影响的对比
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摘要
该文采用有限差分法求解气体流动的雷诺方程,建立引流槽为收敛型、直口型和发散型三种不同形式的T型槽干式密封(CTDGS、ST-DGS和DT-DGS)的数学模型。研究转速和压力变化对三种T型槽密封性能的影响规律。为了确保密封性能的可对比性,使三种T型槽的引流槽弧长、槽深、槽数和动压槽相同。结果表明:在中低压工况下,DT-DGS、ST-DGS相比于CT-DGS具有较好的动压效应,且DT-DGS的开启力最好。在此工况下,引流槽选用发散型、直口型或近直口型的收敛结构具有较好的开启力。在高压工况下,CT-DGS的泄漏量和轴向气膜刚度要优于DT-DGS、ST-DGS。在该工况下,选用结构为收敛型的引流槽可获得较小的泄漏量和较大的轴向气膜刚度。
The finite difference method was used to solve the Reynolds equation for the gas flow. In order to study the influence rule of the seal performance of CT-DGS,ST-DGS and DT-DGS in different rotating speeds or sealing pressures,developed the mathematical models of CT-DGS,ST-DGS and DT-DGS. The equal arc length of inlet groove,the depth of the groove,the number of the groove and dynamic pressure groove can be well correlated with the seal performance of different grooves. DT-DGS and ST-DGS of the dynamic pressure effect were better than CT-DGS under Mid & Low pressure. The opening force of DT-DGS was best. On this condition,the divergent grooves,the straight grooves and the convergent grooves which were similar to the straight groove were selected as the inlet grooves,in consequence the structure can obtain perfect opening force. The leakage and the gas film stiffness of CT-DGS were superior to DT-DGS and ST-DGS. On this condition,the convergent grooves were selected as inlet grooves,which can obtain low leakage and perfect gas film stiffness.
The finite difference method was used to solve the Reynolds equation for the gas flow. In order to study the influence rule of the seal performance of CT-DGS,ST-DGS and DT-DGS in different rotating speeds or sealing pressures,developed the mathematical models of CT-DGS,ST-DGS and DT-DGS. The equal arc length of inlet groove,the depth of the groove,the number of the groove and dynamic pressure groove can be well correlated with the seal performance of different grooves. DT-DGS and ST-DGS of the dynamic pressure effect were better than CT-DGS under Mid & Low pressure. The opening force of DT-DGS was best. On this condition,the divergent grooves,the straight grooves and the convergent grooves which were similar to the straight groove were selected as the inlet grooves,in consequence the structure can obtain perfect opening force. The leakage and the gas film stiffness of CT-DGS were superior to DT-DGS and ST-DGS. On this condition,the convergent grooves were selected as inlet grooves,which can obtain low leakage and perfect gas film stiffness.
引文
[1]朱立新,王汝美.实用机械密封技术问答[M].北京:中国石化出版社,2014:266-267.
[2]M.Gruenewald,W.Wagner.Recent Progress in Compressor Sealing[J].Sealing Technology,2005,(8):6-8.
[3]彭旭东,张岳林,白少先,等.转速压力对T型槽干气密封槽型几何结构参数优选值的影响[J].化工学报,2012,63(2):551-559.
[4]王衍,孙见君,陶凯,等.T型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.
[5]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):1835-1840.
[6]Chunhong Ma,Shaoxian Bai,Xudong Peng.Thermoelastohydrodynamic characteristics of T-grooves gas face seals[J].International Journal of Heat and Mass Transfer,2016,102:277-286.
[7]张岳林,白少先,孟祥铠,等.直线变深T型槽干气密封性能研究[J].润滑与密封,2011,36(9):19-23.
[8]张轩,宋鹏云.T槽干气密封低速运转特性的理论研究[J].润滑与密封,2010,35(10):49-54.
[9]彭旭东,江锦波,白少先,等.中低压干气密封螺旋槽结构参数优化[J].化工学报,2014,65(11):4536-4542].
[10]刘杰,李鲲,吴兆山,等.镶嵌式直线深槽流体动压型机械密封性能研究[J].流体机械,2013,41(12):16-26.
[11]彭旭东,张风云,白少先,等.中低速下干气密封型槽的仿生改进研究[J].摩擦学学报,2014,34(1):43-50.
[12]沈宗沼,李香,杨博峰,等.风机用干气密封的设计与试验研究[J].液压气动与密封,2015,(3):67-69.
[13]Pecht G G,Netzel J P.Design and Application of Non-contacting Gas Lubricated Seals for Slow Speed Services[J].Lubrication Engineering,199,55(7):20-25.
[2]M.Gruenewald,W.Wagner.Recent Progress in Compressor Sealing[J].Sealing Technology,2005,(8):6-8.
[3]彭旭东,张岳林,白少先,等.转速压力对T型槽干气密封槽型几何结构参数优选值的影响[J].化工学报,2012,63(2):551-559.
[4]王衍,孙见君,陶凯,等.T型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.
[5]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):1835-1840.
[6]Chunhong Ma,Shaoxian Bai,Xudong Peng.Thermoelastohydrodynamic characteristics of T-grooves gas face seals[J].International Journal of Heat and Mass Transfer,2016,102:277-286.
[7]张岳林,白少先,孟祥铠,等.直线变深T型槽干气密封性能研究[J].润滑与密封,2011,36(9):19-23.
[8]张轩,宋鹏云.T槽干气密封低速运转特性的理论研究[J].润滑与密封,2010,35(10):49-54.
[9]彭旭东,江锦波,白少先,等.中低压干气密封螺旋槽结构参数优化[J].化工学报,2014,65(11):4536-4542].
[10]刘杰,李鲲,吴兆山,等.镶嵌式直线深槽流体动压型机械密封性能研究[J].流体机械,2013,41(12):16-26.
[11]彭旭东,张风云,白少先,等.中低速下干气密封型槽的仿生改进研究[J].摩擦学学报,2014,34(1):43-50.
[12]沈宗沼,李香,杨博峰,等.风机用干气密封的设计与试验研究[J].液压气动与密封,2015,(3):67-69.
[13]Pecht G G,Netzel J P.Design and Application of Non-contacting Gas Lubricated Seals for Slow Speed Services[J].Lubrication Engineering,199,55(7):20-25.