Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
권호 표지
DOI QR코드

DOI QR Code

Thermohydrodynamic Analysis and Pad Temperature Measurement of a Tilting Pad Journal Bearing for a Turbine Simulator

터빈 시뮬레이터용 틸팅패드 저널베어링의 열윤활 해석 및 패드 온도 측정

  • Lee, Donghyun (Dept. of System Dynamics, Korea Institute of Machinery and Material) ;
  • Sun, Kyungho (Dept. of System Dynamics, Korea Institute of Machinery and Material)
  • 이동현 (한국기계연구원 시스템다이나믹스 연구실) ;
  • 선경호 (한국기계연구원 시스템다이나믹스 연구실)
  • Received : 2017.03.27
  • Accepted : 2017.05.17
  • Published : 2017.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Tilting pad journal bearings(TPJBs) are widely used for high speed rotating machinery owing to their rotordynamic stability and thermal management feature. With increase in the rotating speed of such machinery, an increasingly important aspect of TPJB design is the prediction of their thermal behaviors. Researchers have conducted detailed investigations in the last two decades, which provided design tools for the TPJBs. Based on these previous studies, this paper presents a thermohydrodynamic(THD) analysis model for TPJBs. To calculate pressure distribution, we solve the generalized Reynolds equation and to predict the lubricant temperature, we solve the 3D energy equation. We employ the oil mixing theory to calculate pad inlet temperature; further, to consider heat conduction via the pad, we solve the heat conduction equation for the pads. We assume the shaft temperature as the averaged oil film temperature and apply natural convection boundary conditions to the pad side and back surfaces. To validate the analysis model, we compare the predicted pad temperatures with those from previous research. The results show good agreement with previous research. In addition, we conduct parametric studies on a TPJB which was used in a gas turbine simulator system. The predicted results show that film temperature largely depends on the rotating speed and oil supply condition.

Keywords

References

  1. C. M. McC. Ettles, "The analysis and performance of pivoted pad journal bearings considering thermal and elastic effects", Journal of Lubrication Technology, Vol. 102, No. 2, pp. 182-191, 1980. https://doi.org/10.1115/1.3251465
  2. J. D. Knight, L. E. Barrett, "Analysis of tilting pad journal bearings with heat transfer effects", Journal of Tribology, Vol. 110, No. 1, pp. 128-133, 1988. https://doi.org/10.1115/1.3261550
  3. D. Sudheer Kumar Reddy, S. Swarnamani, B. S. Prabhu, "Thermoelastohydrodynamic analysis of tilting pad journal bearing-theory and experiments", Tribology Transactions, Vol. 43, No. 1, pp. 82-90, 2000. https://doi.org/10.1080/10402000008982316
  4. M. Fillon, J. Bligoud, J. Frene, "Experimental study of tilting-pad journal bearings-comparison with theoretical thermoelastohydrodynamic results", Journal of Tribology, Vol. 114, No. 3, pp. 579-587, 1992. https://doi.org/10.1115/1.2920920
  5. K. Brockwell, W. Dmochowski, S. Decamillo, "An investigation of the steady-state performance of a pivoted shoe journal bearing with ISO VG 32 and VG 68 oils", Tribology Transactions, Vol. 47, No. 1, pp. 480-488, 2004. https://doi.org/10.1080/05698190490493382
  6. K. Brockwell, S. Decamillo, W. Dmochowski, "Measured temperature characteristics of 152 mm diameter pivoted shoe journal bearings with flooded lubrication", Tribology Transactions, Vol. 44, No. 4, pp. 543-550, 2001. https://doi.org/10.1080/10402000108982493
  7. S. Taniguchi, T. Makino, K. Takeshita, T. Ichimura, "A thermohydrbdynamic analysis of large tilting-pad journal bearing in laminar and turbulent flow regimes with mixing", Journal of Tribology, Vol. 112, No. 3, pp. 542-548, 1990. https://doi.org/10.1115/1.2920291
  8. W. Dmochowski, K. Brockwell, S. Decamillo, A. Mikula, "A study of the thermal characteristics of the leading edge groove and conventional tilting pad journal bearings", Journal of Tribology, Vol. 115, No. 3, pp. 219-226, 1993. https://doi.org/10.1115/1.2920995
  9. D. Brugier, M. T. Pascal, "Influence of elastic deformations of turbo-generator tilting pad bearings on the static behavior and on the dynamic coefficients in different designs", Journal of Tribology, Vol. 111, No. 2, pp. 364-371, 1989. https://doi.org/10.1115/1.3261925
  10. K. D. Wygant, R. D. Flack, L. E. Barrett, "Measured performance of tilting-pad journal bearings over a range of preloads—part I: Static operating conditions", Tribology Transactions, Vol. 47, No. 4, pp. 576-584, 2004. https://doi.org/10.1080/05698190490504154
  11. Ha, H., Kim, K., "A study on the effects of temperature rise and turbulence on the performance of large tiling pad journal bearings", J. Korean Soc. Tribol. Lubr. Eng., Vol. 9, No. 1, pp. 22-31, 1993.
  12. Kim, S., Kang, J., Kim, K., "Effects of pad number on the static performances of large tiling pad journal bearings", J. Korean Soc. Tribol. Lubr. Eng., Vol. 20, No. 6, pp. 330-336, 2004.
  13. Kim, S., Influence of Pad-Pivot Friction on the Performance of Tilting Pad Journal Bearing, Doctoral Thesis, Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Korea, 2007.

Cited by

  1. 전술차량용 종감속기 마모패드 최적설계에 관한 연구 vol.18, pp.10, 2017, https://doi.org/10.14775/ksmpe.2019.18.10.054
  2. 열 경계 조건이 다른 틸팅패드저널베어링의 성능 vol.37, pp.1, 2017, https://doi.org/10.9725/kts.2021.37.1.14