Tribology and Lubricants

  • 제34권5호
  • /
  • Pages.183-190
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  • 2018
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  • 2713-8011(pISSN)
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  • 2713-802X(eISSN)
한국트라이볼로지학회 (Korean Tribology Society)
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씰 투스 간극이 틸팅 패드 저어널 베어링 손실과 온도에 미치는 영향

Effect on Seal Tooth Clearance on Power Loss and Temperature of Tilting Pad Journal Bearing

  • 방경보 (두산중공업 터빈발전기그룹) ;
  • 최용훈 (두산중공업 터빈발전기그룹) ;
  • 조용주 (부산대학교 기계공학과)
  • 투고 : 2018.06.25
  • 심사 : 2018.09.26
  • 발행 : 2018.10.31
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초록

Tilting pad journal bearing is widely used for steam turbines because of its excellent dynamic stability. As the turbine capacity increases, power loss in the bearings becomes a matter of concern. Power loss in tilting pad journal bearings can be reduced by increasing the bearing clearance and reducing the pad arc length. In this study, the tilting pad journal bearing is tested by changing the seal tooth clearance to verify the static characteristics of the bearing. Bearing power loss and bearing metal temperature are evaluated to compare the bearing's performance and reliability for several test cases. The test bearing is a tilting pad journal bearing with 300.62mm inner diameter and 120.00mm active length. The bearing power loss, its metal temperature, and oil film thickness are measured and evaluated based on the rotor's rotational speed, oil flow rate, and bearing load. Test results show that a tilting pad journal bearing with large seal tooth clearance has 40% lower power loss compared with a bearing with a small seal tooth clearance. As the seal tooth clearance is increased, the power loss of the tilting pad journal bearing decreases. However, with respect to the bearing metal temperatures, a detuning point is observed that makes the minimum bearing metal temperature. Moreover, as the seal tooth clearance is increased, the oil film thickness increases due to high viscosity.

키워드

참고문헌

  1. Bang, K.-B., Kim, C.-H., "Cooling effect of lubricants and dynamic characteristics of oil film of partial tilting pad bearing", Proceeding of ASME/STLE International Joint Tribology Conference, IJTC2007-44023, 2007.
  2. Kim, T. H., Choi, T. G., Kim, C. H., "Rotordynamic performance predictions of tilting pad journal bearing with rocker-back pivots and comparison with published test results", J. Korean Soc. Tribol. Lubr. Eng., Vol. 31, No. 6, pp. 294-301, 2015. https://doi.org/10.9725/kstle.2015.31.6.294
  3. Lee, D.-H., Sun, K.-H., Kim, B.-O., Kaing, D.-H., "Thermohydrodynamic analysis and pad temperature measurement of tilting pad journal bearing with worn Pad", J. Korean Soc. Tribol. Lubr. Eng., Vol. 33, No. 4, pp. 134-140, 2017.
  4. Zeidan, F. Y., Herbage, B. S., "Fluid film bearing fundamentals and failure analysis", Proceeding of the 20th turbomachinery symposium, pp. 161-186, 1991.
  5. Leopard, "Tilting pad bearings - Limits of operation", ASLE 30th annual meeting in Atlanta, Georgia, May 5-8, pp. 1-11, 1975.
  6. Fouad, Y. Zeidan, Donald J. Paquette, "Application of high speed and high performance fluid film bearing in rotating machinery", Proceeding of the 23th Turbomachinery Symposium, pp. 209-233, 1994.
  7. Herbage, B. S., "High speed journal and thrust bearing design", Proceeding of the 1st Turbomachinery Symposium, pp. 56-61, 1972.
  8. Nicholas, J. C., "Pad bearing assembly with fluid spray and blocker bar", US Patent No. 5738447, rotating machinery technology, Inc., Wellsville, New York, 1998.
  9. Nicholas, J. C., "Tilting pad bearing design", Proceeding of the 23th Turbomachinery Symposium, pp. 179-194, 1994.
  10. Tanaka, M., "Thermohydrodynamic performance of a tilting pad journal bearing with spot lubrication", ASME Journal of Tribology, Vol. 113, No. 3, pp. 615-619, 1991. https://doi.org/10.1115/1.2920668
  11. Nicholas, J. C., "Tilting pad bearing with spray-bar blockers and by-pass cooling for high speed, high load applications", Proceeding of the 32th Turbomachinery Symposium, pp. 27-37, 2003.
  12. Fouad, Y. Zeidan, Warwick, R. I., "Method and bearing construction for control of hot oil carryover and loss of lubricant", US Patent No. 5547287, KMC, Inc., 1996.
  13. Brockwell, K., Dmochowski, W., DeCamillo, S., "Analysis and testing of the leg tilting pad journal bearing-A new design for increasing load capacity, reducing operating temperatures and conserving energy", Proceeding of the 23th Turbomachinery Symposium, pp. 43-56, 1994.
  14. DeCamillo, S., Brockwell, K., "A study of parameters that affect pivoted shoe journal bearing performance in high-speed turbomachinery", Proceeding of the 30th Turbomachinery Symposium, pp. 9-22, 2001.
  15. Stephen, L. Edney, John K. Waite, Scan M. DeCamillo, "Profiled leading edge groove tilting pad journal bearing for light load operation", Proceeding of the 25th Turbomachinery Symposium, pp. 1-16, 2006.
  16. Dmochowski, W., Brockwell, K., DeCamillo, S., Mikula, A., "A Study of the thermal characteristics of the leading edge groove and conventional tilting pad journal bearings", Journal of Tribology, Vol. 115, pp. 219-226, April 1993. https://doi.org/10.1115/1.2920995
  17. Dmochowski, W. M., Blair, B., "Effect of oil evacuation on the static and dynamic properties of tilting pad journal bearings", Tribology Transactions, Vol. 49, pp. 536-544, 2006. https://doi.org/10.1080/10402000600885175