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研究生： 阮志強
Cuong, Nguyen Chi
論文名稱： 微系統中螺旋溝槽空氣軸封分析
Analysis of Spiral-Grooved Mechanical Face Seals in Microsystems
指導教授： 李旺龍
Li, Wang-Long
學位類別： 碩士
Master
系所名稱： 工學院 - 奈米科技暨微系統工程研究所
Institute of Nanotechnology and Microsystems Engineering
論文出版年： 2012
畢業學年度： 100
語文別： 英文
論文頁數： 113
外文關鍵詞： Gas face seal, micro-scale effect, spiral groove, modified molecular gas lubrication, Knudsen number, tangential momentum accommodation coefficient
相關次數： 點閱：66  下載：2 
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    • The gas film face seal (GFFS) is widely used in applications of high speed turbomachinery. The improved spiral-grooved gas film face seal (SGGFFS) possesses a high pressure of gas film in maintained non-contacting face seal, reduces the leakage efficiently. In this research, the performance of SGGFFS is firstly discussed in micro systems. The gas rarefaction effects are significantly considered on sealing performance with two important parameters as the Knudsen number, and accommodation coefficients, (ACs). The small variation in gas film thickness and pressure are substituted into the modified molecular gas lubrication (MMGL) equation for linearized analysis. The Poiseuille and Couette flow rate correctors are added in the MMGL equation to expand the lubrication theory with the arbitrary and ACs parameters. Then the linearized MMGL equation is solved by finite element method, load capacity and dynamic coefficients are obtained by integration the dynamic pressure over the sealing interfaces. Finally, the numerical results predict the influence of geometric and operational conditions on the seal performance and the load capacity and dynamic coefficients of micro-gas film seal are investigated under the influence of gas rarefaction effect with basic operation conditions.

    ACKNOWLEDGEMENTS I ABSTRACT II MOTIVATION III TABLE OF CONTENTS IV LIST OF TABLES VII LIST OF FIGURES VIII LIST OF NOMENCLATURE XV CHAPTER ONE INTRODUCTION 1 Research Background 1 Active and Objective 4 1.1 Introduction about Mechanical Face Seals 4 1.1.1 The Factor effect on the Sealing performance 5 1.1.2 The Operation Principle of Mechanical Gas Face Seals 6 1.1.3 The distribution of spiral groove gas film face seal 7 1.2 Mechanics of Gas Sealing in Microsystem 10 1.3 The rarefaction effect and modified molecular gas lubrication equation 12 1.3.1 Rarefaction effect consider on the Knudsen number and Accommodation Coefficient AC 12 1.3.2 Rarefaction effect is applied in the modified molecular gas lubrication equation. 14 CHAPTER TWO THEORETICAL MODEL 18 2.1 Consider the factor effect on sealing performance 18 2.2 Solution for Fluid Pressure Distribution 19 2.2.1 Principle of mass conservation and continuity equation 19 2.2.2 NAVIER-STOKES equations 21 2.2.3 Mean Free Path and the Knudsen Number 23 2.3 The governing equation with compressible Reynolds equation 25 2.3.1 The contribution of Tangential Momentum Accommodation Coefficient 31 2.3.2 Full Database for the Couette flow rate and Poiseuille flow 34 2.4 The application of MMGL equation to SGGFFS 35 2.4.1 Considering on the complexity geometry of the spiral-groove Face Seal 35 2.4.2 The expansion the MMGL equation with film thickness and gas pressure variation. 38 2.4.3 The expansion MMGL with the zero and first-order equation 39 2.4.4 Taking with the Laplace Transformation 41 2.5 Modeling for load capacity and dynamic coefficients of gas film face seal 47 CHAPTER THREE NUMERICAL METHOD 51 3.1 Introduction for numerical method in analysis SGGFFS 51 3.2 The characteristic of spiral groove gas film face seal in COMSOL 53 CHAPTER FOUR RESULTS AND DISCUSSION 56 4.1 The investigation effect of operation conditions 57 4.1.1 The Effect of Bearing Number 57 4.1.2 Effect of the inverse Knudsen Number D0 62 4.2 The investigation effect of geometric conditions 72 4.2.1 Effect of groove depth ratio with various bearing number 72 4.2.2 Effect of groove depth ratio with various the tilt angles 80 4.2.3 The optimal groove depth ratio investigation 84 4.3 Effect of gas rarefaction on the load capacity of SGGFFS 90 4.4 Effect of gas rarefaction on the dynamic coefficients of SGGFFS 96 CHAPTER FIVE CONCLUSION AND SUGGESTIONS 108 REFERENCES 110

    1.S. Bai, X. Peng, Y. Li and S. Sheng, 2010, "A Hydrodynamic Laser Surface-Textured Gas Mechanical Face Seal", Tribology Letters. Vol. 38, pp. 187-194.
    2.M. Fangbo, S. Pengyun and G. Jie, 2012, "Numerical Analysis of Radial Groove Gas-Lubricated Face Seals at Slow Speed Condition", Advanced Materials Research. Vol. 468-471, pp. 2304-2309.
    3.M. T. C. Faria and W. Mendes Miranda, 2012, "Pressure dam influence on the performance of gas face seals", Tribology International. Vol. 47, pp. 134-141.
    4.J. Zhou, B. Gu and Y. Chen, 2007, "An Improved Design of Spiral Groove Mechanical Seal", Chinese Journal of Chemical Engineering. Vol. 15, pp. 499-506.
    5.S. Leefe, 1994, "Modeling of Plain Face Gas Seal Dynamics", 14th International Conference on Fluid Sealing, BHR Group Conference Series,. Vol. 9, pp. 397–424.
    6.Y. Liu, X. Shen and W. Xu, 2002, " Numerical analysis of dynamic coefficients for gas film face seals", Journal of tribology. Vol. 124, pp. 743-754.
    7.D. Bonneau, J. Huitric and B. Tournerie, 1993, "Finite element analysis of grooved gas thrust bearings and grooved gas face seals", Journal of Tribology. Vol. 115, pp. 348-354.
    8.M. H. Oladeinde and J. A. Akpobi, 2010, "Control Volume Method Applied To Simulation Of Hydrodynamic Lubrication Problem ", periodical Control Volume Method Applied To Simulation Of Hydrodynamic Lubrication Problem San Francisco, USA

    9.M. B. A and I. Green, 2003, "Semi-Analytical Dynamic Analysis of Spiral-Grooved Mechanical Gas Face Seals", 125, pp. 403-413.
    10.M. T. C. FARIA, 2001, "Some Performance Characteristics of High Speed Gas Lubricated Herringbone Groove Journal Bearings", JSME Int J Tribol. Vol. 44(3), pp. 775-781.
    11.G. Meng, W.-M. Zhang, H. Huang, H.-G. Li and D. Chen, 2009, "Micro-rotor dynamics for micro-electro-mechanical systems (MEMS)", Chaos, Solitons & Fractals. Vol. 40, pp. 538-562.
    12.A. H. Epstein, S. D. Senturia, G. Anathasuresh, A. Ayon, K. Breuer, K. S. Chen, F. Ehrich, G. Gauba, R. Ghodssi, C. Groshenry et al, 1997, "Power MEMS and microengines", Vol. 2, pp. 753-756.
    13.E. B. Arkilic, 1997, "Measurement of the mass flow and tangential momentum accomodation coefficient in silicon micromachined channels", Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics,
    14.B. Wang and H. Zhang, 2011, "Numerical Analysis of a Spiral groove Dry gas Seal Considering Microscale Effects ", Chinese Journal of Mechanical Engineering. Vol. 24, pp. 146-153.
    15.A. A. Polycarpou and I. Etsion, 1998, "Static Sealing Performance of Gas Mechanical Seals Including Surface Roughness and Rarefaction Effects", Tribology Transactions. Vol. 41, pp. 531-536.
    16.B. A. Miller and I. Green, 2001, "Numerical Formulation for the Dynamic Analysis of Spiral-Grooved Gas Face Seals", Journal of Tribology. Vol. 123, pp. 396.
    17.N. S. Lee, D. H. Choi, Y. B. Lee, T. H. Kim and C. H. Kim, 2002, "The Influence of the Slip Flow on Steady-State Load Capacity, Stiffness and Damping Coefficients of Elastically Supported Gas Foil Bearings", Tribology Transactions. Vol. 45, pp. 478-484.
    18.Y.-B. Lee, H.-D. Kwak, C.-H. Kim and N.-S. Lee, 2005, "Numerical prediction of slip flow effect on gas-lubricated journal bearings for MEMS/MST-based micro-rotating machinery", Tribology International. Vol. 38, pp. 89-96.
    19. H. Huang, G. Meng and J. Chen, 2007, "Investigations of Slip Effect on the Performance of Micro Gas Bearings and Stability of Micro Rotor-Bearing Systems", Sensors. Vol. 7, pp. 1399-1414.
    20.C.-C. Hwang, R.-F. Fung, R.-F. Yang, C.-I. Weng and W.-L. Li, 1996 "A New Modified Reynolds Equation for Ultra Thin Film Gas Lubrication", IEEE Transactions on Magnetics. Vol. 32 (2), pp. 344-347.
    21.T. Veijola, H. Kuisma and J. Lahdenperä, 1998, "The influence of gas-surface interaction on gas-film damping in a silicon accelerometer", Sensors and Actuators A: Physical. Vol. 66, pp. 83-92.
    22.S. Fukui and R. Kaneko, 1990, "A Database for Interpolation of Poiseuille Flow Rates for High Knudsen Number Lubrication Problems", Journal of tribology Vol. 112, pp. 78-83.
    23.W. L. Li, 2003, "A database for interpolation of poiseuille flow rate for arbitrary Knudsen number lubrication problems", Journal of the Chinese Institute of Engineers. Vol. 26, pp. 455-466.
    24.W. L. Li, 2002, "A database for Couette flow rate considering the effects of non-symmetric molecular interactions", Journal of tribology. Vol. 124, pp. 869-873.
    25.A. O. Lebeck, 1991, "Principles and design of mechanical face seals", New York.
    26.H. Lubbinge and Enschede, 1999, "On The Lubrication Of Mechanical Face Seals ", University of Twente.
    27.Y. Wang, H. Yang, J. Wang, Y. Liu, H. Wang and X. Feng, 2009, "Theoretical Analyses and Field Applications of Gas-Film Lubricated Mechanical Face Seals with Herringbone Spiral Grooves", Tribology Transactions. Vol. 52, pp. 800-806.
    28.K. Breuer, F. Ehrich, L. Fréchette, S. Jacobson, C.-C. Lin, D. J. Orr, E. Piekos, N. Savoulides and C.-W. Wong, 2000, "Challenges for lubrication in high-speed MEMS".
    29.G. Ramanaiah, 1969, "Influence of molecular mean free path in gas-lubricated thrust bearings", Wear. Vol. 14, pp. 193-198.
    30.B. Ruan, 2000, "Finite Element Analysis of the Spiral Groove Gas Face Seal at the Slow Speed and the Low Pressure Conditions — Slip Flow Consideration", Tribology Transactions. Vol. 43, pp. 411-418.
    31. B. Ruan, 2002 "Numerical Modeling of Dynamic Sealing Behaviors of Spiral Groove Gas Face Seals", Journal of Tribology. Vol. 124, pp. 186.
    32.N. Zirkelback and L. S. Andres, 1999, "Effect of Frequency Excitation on Force Coefficients of Spiral Groove Gas Seals ", Journal of Tribology Vol. 121, pp. 853.
    33.K. Czołczyński, 1996, "How to obtain stiffness and damping coefficients of gas bearings", Wear. Vol. 201, pp. 265-275.
    34.M. T. C. Faria, 2001, "An Efficient Finite Element Procedure for Analysis of High-Speed Spiral Groove Gas Face Seals", Journal of Tribology. Vol. 123, pp. 205.
    35.W. L. Li and R. W. Shen, 2009, "Linear Stability Analysis of the Herringbone Groove Journal Bearings in Microsystems: Consideration of Gas Rarefaction Effects", Journal of tribology. Vol. 131, pp. 014705.
    36.B. J. Hamrock, 2004, "Fundamentals of fluid film lubrication", In. 2nd ed edn, New York.
    37.X.-J. Rao, K.-M. Chang and W.-L. Li, 2011, "Characteristics of micro-gas journal bearings based on kinetic theory", Tribology International. Vol. 44, pp. 241-247.
    38.Q. Zhang and X. Shan, 2008, "Dynamic characteristics of micro air bearings for microsystems", Microsystem Technologies. Vol. 14, pp. 229-234.
    39.W. Huang and D. B. Bogy, 2000, "The Effect of the Accommodation Coefficient on Slider Air Bearing Simulation", Journal of Tribology. Vol. 122, pp.
    40.I. Green and I. Etsion, 1985, "Stability Threshold and Steady-State Response of Noncontacting Coned-Face Seals", A S L E Transactions. Vol. 28, pp. 449-460.
    41.N. Zirkelback, 2000, "Parametric Study of Spiral Groove Gas Face Seals", Tribology Transactions. Vol. 43, pp. 337-343.

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