Steady-State Characteristics of Spiral Groove Floating Ring Gas-film Seal Considering Temperature-Viscosity Effect

Document Type : Regular Article

Authors

College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China

Abstract

During the operation of the floating ring gas film seal, a certain amount of heat is generated inside the seal gap, giving rise to thermal deformation of the seal rings, and further leading to operation unstable and increased leakage rate. Based on the gas lubrication theory, the control equations of gas pressure and gas film thickness of the floating ring gas film seal are obtained. And the energy and temperature-viscosity equation are also introduced. The above equations were solved by the finite difference method and their correctness was verified by experiments. The variation of opening force, leakage rate, friction force, and gas film temperature rise with rotating speed, inlet pressure, and eccentricity were analyzed. The results reveal that, for leakage rate, the difference between the modeled and tested values is only 2.94% at high speeds, taking into account the influence of the temperature-viscosity effect. The experiment substantiates that the temperature-viscosity effect model is scientifically valid. Operation parameters also have different effects on sealing performance. Compared with isothermal flow, the pressure distribution in the gas film flow field will change significantly with increasing gas temperature, which means that the temperature-viscosity effect cannot be neglected in the flow field calculation. These results provide grounds for further study of the thermoelastic effect of air film seal of floating ring and have important engineering significance.

Keywords

References

Andrés, L. and Z. Ashton (2010). Comparison of leakage performance in three types of gas annular seals operating at a high temperature (300oC). Tribology Transactions 53(3), 463-471.##
Bai, S., X. Peng and Y. Meng (2012). Modeling of gas thermal effect based on energy equipartition principle. Tribology Transactions 55(6), 752-761.##
Ding, X. and J. Lu (2016). Theoretical analysis and experiment on gas film temperature in a spiral groove dry gas seal under high speed and pressure. International Journal of Heat and Mass Transfer 96, 438-450.##
Fu, J. and K. Yusa (2003). Measurement of force acting on a moving part of a pneumatic linear bearing. Review of Scientific Instruments 74(6), 3137-3141.##
Grigor’Ev, B. and A. Fedorov (2019). Thermohydrodynamic model of the tilting-pad journal bearing. Journal of Machinery Manufacture and Reliability 48(3), 236-242.##
Guo, H., S. Yang and S. Zhang (2019). Influence of temperature–viscosity effect on ring-journal speed ratio and stability for a hydrodynamic floating ring bearing. Industrial Lubrication & Tribology 71(4), 540-547.##
Hou, G., H. Su and G. Chen (2020). Performance analysis of compliant cylindrical intershaft seal. Science Progress 103(3), 003685042094195.##
Joachimmiak, D. (2020). Universal method for determination of leakage in labyrinth seal. Journal of Applied Fluid Mechanics 13(3), 935-943.##
Joachimmiak, D. and P. Krzyslak (2019). Analysis of the gas flow in a labyrinth seal of variable pitch. Journal of Applied Fluid Mechanics 12(3), 921-930.##
Li, G., Q. Zhang and E. Huang (2019). Leakage performance of floating ring seal in cold/hot state for aero-engine. Chinese Journal of Aeronautics 3(004), 11-23.##
Li, P., F. Zeng and S. Xiao (2021). Effects of texture bottom profile on static and dynamic characteristics of journal bearings. Shock and Vibration.##
Li, Z., Z. Fang and J. Li (2018). Numerical investigation on the leakage and rotordynamic characteristics for three types of annular gas seals in wet gas conditions. Turbomachinery Technical Conference and Exposition 141(3), 032504-1.##
Lu, J. (2020). Theoretical optimization and experiment on lubrication of floating microgroove cylindrical seal. Industrial Lubrication and Tribology 72(10), 1217-1226.##
Luis S. and H. Tae (2010). Thermohydrodynamic analysis of bump type gas foil bearings: a model anchored to test data. Journal of Engineering for Gas Turbines and Power: Transactions of the ASME 4, 042504-1-042504-10.##
Ma, C., S. Bai and X. Peng (2016a). Thermo-hydrodynamic characteristics of spiral groove gas face seals. operating at low pressure. Tribology International 95, 44-54.##
Ma, C., S. Bai and X. Peng (2016b). Thermoelastohydrodynamic characteristics of T-grooves gas face seals. International Journal of Heat and Mass Transfer 102, 277-286.##
Ma, G., Li, X., and Shen, X. (2011a). Multi-dimensional optimization of groove parameters in gas film seal. Advanced Materials Research 199-200, 1303-1307.##
Ma, G., W. Zhao and X. Shen (2011b). Analysis of parameters and performance for spiral grooved cylindrical gas film seal. Procedia Engineering 23, 115-119.##
Ma, P., B. Jiang and J. Zhang (1981). Critical assessment of viscosity and its correlation with temperature for gaseous substances under normal pressure. Journal of Chemical Industry and Engineering 32 (3), 193-205. (in Chinese).##
Dyk, Š., J. Rendl, M. Byrtus and L. Smolík (2018). Dynamic coefficients and stability analysis of finite-length journal bearings considering approximate analytical solutions of the Reynolds equation. Tribology International 130, 229-244.##
Shi, J., H. Cao and X. Chen (2019). Effect of angular misalignment on the static characteristics of rotating externally pressurized air journal bearing. Science China Technological Sciences 62(9), 1520-1533.##
Shi, J., H. Cao and X. Chen (2020). Effect of angular misalignment on the dynamic characteristics of externally pressurized air journal bearing. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234(2), 205-228.##
Su, H., R. Rahmani and H. Rahnejat (2016). Thermohydrodynamics of bidirectional groove dry gas seals with slip flow. International Journal of Thermal Sciences 110, 270-284.##
Sun, X., P. Song and X. Hu (2021). Cross-scale flow field analysis of sealing chamber and end face considering the CO2 real gas effect. Journal of Applied Fluid Mechanics 14(4), 979-991.##
Teixeira, J., A. Georgakis and C. Tibos (2017). Investigation of effective groove types for a film riding seal. Journal of Engineering for Gas Turbines and Power: Transactions of the ASME 139(7), 072503-1.##
Wang, Z., J. Zhu and N. Zhao (2021). A low dissipation finite difference nested multi-resolution WENO scheme for Euler/Navier-Stokes equations. Journal of Computational Physics 429, 110006.##
Xia, P., H. Chen and Z. Liu (2019). Analysis of whirling motion for the dynamic system of floating ring seal and rotor. ARCHIVE Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology 233(8), 135065011982937.##
Xia, P., G. Zhang and J. Zhao (2017). Investigations on rotordynamic characteristics of a floating ring seal considering structural elasticity. Turbomachinery Technical Conference & Exposition 50923, V07AT34A021.##
Xie, J., C. Ma and S. Bai (2020). Thermo-distortion characteristics of spiral groove gas face seal at high temperature. Numerical Heat Transfer Fundamentals 77(3), 242-256.##
Xu, R., Y. Hu and J. Yin (2018). A transient CFD research on the dynamic characteristics of liquid annular seals. Annals of Nuclear Energy 120, 528-533.##
Zhang, J. and J. Wang (2018). Numerical analysis for Navier-Stokes equations with time fractional derivatives. Applied Mathematics & Computation 336, 481-489.##
Zhang, Y., G. Chen and L. Wang (2019a). Effect of thermal and elastic deformations on lubricating properties of the textured journal bearing. Advances in Mechanical Engineering 11(10): 168781401988379.##
Zhang, Y., G. Chen and L. Wang (2019b). Thermoelastohydrodynamic analysis of misaligned bearings with texture on journal surface under high-speed and heavy-load conditions, Chinese Journal of Aeronautics S1000936118302681.##
Zhang, Y., S. Yu and C. Lu (2019c). An improved lumped parameter method for calculating static characteristics of multi-recess hydrostatic journal bearings. ARCHIVE Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology 234(2): 135065011985524.##
Zhong, L. and N. Xie (2017). The lubrication performance of water lubricated bearing with consideration of wall slip and inertial force. Journal of Hydrodynamics Ser B 29(1), 52-60.##

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History

  • Received: 15 July 2022
  • Revised: 03 November 2022
  • Accepted: 27 November 2022
  • Available online: 01 April 2023

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