Anisotropic heat transfer model of finger seal based on porous media
-
摘要: 在指尖密封多孔介质流动模型的基础上,将指尖密封片之间的接触传热附加于固体导热之中,之后通过对密封固体结构与结构内流体的耦合各向异性传热进行理论分析,建立了指尖密封各向异性传热数学模型;基于商业软件Fluent中的用户自定义标量(UDS)方程功能,开发了多孔介质各向异性传热数值计算模块,并数值模拟了指尖密封结构内的流动与传热特性。结果表明:指梁与指尖靴区域的各向异性有效导热系数张量与孔隙率、径向和周向位置以及轴向接触热阻等因素相关;指尖密封最高温度出现在指尖靴与转子接触面的略下游处;与各向同性传热模型相比,采用各向异性传热模型时,指梁下部和指尖靴区域沿径向和轴向存在较大温度梯度,但温度沿周向的变化两者均很小;泄漏量随着压差的增加逐渐增大,随着转子转速的增加基本不变;指尖密封最高温度值随着压差的增加逐渐减小,随着转子转速的增加逐渐增大。
-
关键词:
- 指尖密封 /
- 自定义标量(UDS) /
- 多孔介质 /
- 各向异性传热 /
- 温度场
Abstract: An anisotropic heat transfer model was built by theoretically analyzing the contact and anisotropic heat transfer characteristics coupled finger seal and fluid flow within the structure on the basis of porous model. Then, an anisotropic heat transfer numerical calculation model was developed on the basis of userdefined scalar (UDS) function of commercial software Fluent, and the heat transfer and flow characteristics of finger seal were simulated. Results showed that the effective thermal conductivity tenser of finger beam and finger foot was related to the factors of porosity, radial and circumferential position, and axial contact resistance. The highest temperature of finger seal appeared slightly downstream the contact surface between finger foot and rotor. Besides, compared with isotropic heat transfer model, the temperature decreased greatly at radial and axial directions in finger foot and lower part of finger beam zones while using anisotropic heat transfer model, however, it remained unchanged in circumference both of them. Seal leakage increased with the increasing pressure differential but kept stable with the increasing rotation speed. The height temperature decreased with the increasing pressure differential but increased with the increasing rotation speed.-
Key words:
- finger seal /
- userdefined scalar(UDS) /
- porous media /
- anisotropic heat transfer /
- temperature field
-
[1] ARORA G K,PROCTOR M P,STEINETZ B M,et al.Pressure balanced,low hysteresis,seal test results[R].Cleveland,USA:NASA Glenn Research Center,1999. [2] PROCTOR M P,KUMAR A,DELGADO I R.Highspeed,hightemperature finger seal test results[J].Journal of Propulsion and Power,2004,20(2):312-318. [3] PROCTOR M P,DELGADO I R.Preliminary test results of a noncontacting finger seal on a herringbonegrooved rotor[R].AIAA-2008-4506,2008. [4] 申晓龙,陈国定,苏华.结构及工况对人字型指尖气浮密封的性能影响[J].航空动力学报,2011,26(2):416-421.SHEN Xiaolong,CHEN Guoding,SU Hua.Sealing performances analysis for a herringbonegrooved finger gas seal structure and working parameter[J].Journal of Aerospace Power,2011,26(2):416-421.(in Chinese) [5] 郎达学,苏华.表面织构靴底流体动压指尖密封的性能分析[J].航空学报,2012,33(8):1540-1546.LANG Daxue,SU Hua.Performance analysis of surface texture padded finger seal[J].Acta Aeronautica et Astronautica Sinica,2012,33(8):1540-1546.(in Chinese) [6] ZHANG H,ZHENG Q,YUE G,et al.Unsteady numerical analysis of a whole ring of finger seal with grooves on finger pads[R].ASME Paper GT2013-94514,2013. [7] FLEMING D P.Approximate solution for choked flow in gas seal pads[R].Cleveland,USA:NASA Glenn Research Center,2004. [8] CIOC S,FLEMING D P,KEITH T G,et al.Numerical investigation of choked flow in padded finger seals[R].World Tribology Congress,WTC-2005-64006,2005. [9] BRAUN M J,KUDRIAVTSEV V V,STEINETZ B M,et al.Two and threedimensional numerical experiments representing two limiting cases of an inline pair of finger seal components[J].International Journal of Rotating Machinery,2003,9(3):171-179. [10] BRAUN M J,LI H.An integrated numerical fluidsolid interaction model for finger seals with a padded lowpressure laminate[R].San Diego,California USA:ASME/STLE International Joint Tribology Conference,2007. [11] 李国见,李建华,陈国定,等.动压型指尖密封泄漏特性的分析[J].科学技术与工程,2007,7(13):3157-3159.LI Guojian,LI Jianhua,CHEN Guoding,et al.Analysis to the leakage patterns of hydrodynamic pressure finger seals[J].Science Technology and Engineering,2007,7(13):3157-3159.(in Chinese) [12] YUE G,ZHENG Q,ZHU R.Numerical simulation of a padded finger seal[R].ASME Paper GT2008-50997,2008. [13] ZHANG H,ZHENG Q,YUE G.Study on the leakage and deformation characteristics of the finger seals by using numerical simulation[R].ASME Paper GT20101-23194,2010. [14] 王旭,张文平,来亮,等.指尖密封泄漏流动的数值仿真分析[J].航空动力学报,2005,20(4):590-594.WANG Xu,ZHANG Wenping,LAI Liang,et al.Numerical simulation and analysis of a finger seal leakage flow[J].Journal of Aerospace Power,2005,20(4):590-594.(in Chinese) [15] BRAUN M J,PIERSON H M,DENG D.Thermofluids considerations and the dynamic behavior a finger seal assembly[J].Tribology Transactions,2005,48(4):531-547. [16] 苏华,陈国定.指尖密封的温度场及热结构耦合分析[J].航空动力学报,2009,24(1):196-203.SU Hua,CHEN Guoding.Analysis of temperature field and coupled thermal and structure for finger seal[J].Journal of Aerospace Power,2009,24(1):196-203.(in Chinese) [17] BRAUN M J,HENDRICKS R C,CANACCI V A.Nonintrusive qualitative and quantitative flow characterization and bulk flow model for brush seals[R].Nagoya,Japan:International Tribology Conference,1990. [18] HENDRICKS R C,SCHLUMBERGER J,BRAUN M J.A bulk flow model of a brush seal system[R].Orlando,USA:International Gas Turbine and Aeroengine Congress and Exposition,1991. [19] 白花蕾.指式封严泄漏特性的实验研究和数值模拟[D].南京:南京航空航天大学,2008.BAI Hualei.Experimental and numerical study on leakage characteristics of finger seal[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2008.(in Chinese) [20] 曹静,吉洪湖,金峰,等.指式封严结构中气流流动与传热特性分析[J].航空发动机,2011,37(4):33-36.CAO Jing,JI Honghu,JIN Feng,et al.Analysis of air flow and heat transfer characteristics in finger seal structure[J].Aeroengine,2011,37(4):33-36.(in Chinese) [21] 林瑞泰.多孔介质传热传质引论[M].北京:科学出版社,1995. [22] 张洪济.热传导[M].北京:高等教育出版社,1992. [23] COOPER M G,MIKIC B B,YOVANOVICH M M.Thermal contact conductance[J].International Journal of Heat and Mass Transfer,1969,12(3):279-300. [24] MILANEZ F H,YOVANOVICH M M,CULHAM J R.Effect of surface asperity truncation on thermal contact conductance[J].IEEE Transactions on Components and Packaging Technologies,2003,26(1):48-54. [25] 王峰,陈国定,余承涛.基于粗糙接触的指尖密封热分析[J].机械科学与技术,2007,26(7):893-896.WANGFeng,CHEN Guoding,YU Chengtao.Thermal analysis of the finger seal system with rough contact[J].Mechanical Science and Technology for Aerospace Engineering,2007,26(7):893-896.(in Chinese)
点击查看大图
计量
- 文章访问数: 944
- HTML浏览量: 7
- PDF量: 684
- 被引次数: 0