Development of a Water Droplet Erosion Model for Large Steam Turbine Blades

  • Lee, Byeong-Eun (Department of Aeronautical Engineering, Korea Aviation Polytechnic College) ;
  • Riu, Kap-Jong (School of Mechanical Engineering, College of Engineering, Kyungpook National University) ;
  • Shin, Se-Hyun (School of Mechanical Engineering, College of Engineering, Kyungpook National University) ;
  • Kwon, Soon-Bum (School of Mechanical Engineering, College of Engineering, Kyungpook National University)
  • Published : 2003.01.01

Abstract

Water droplet erosion is one of major concerns in the design of modern large fossil steam turbines because it causes serious operational problems such as performance degradation and reduction of service life. A new erosion model has been developed in the present study for the prediction of water droplet erosion of rotor blades operated in wet steam conditions. The major four erosion parameter : impact velocity, impacting droplet flow rate, droplet size and hardness of target are involved in the model so that it can also be used for engineering purpose at the design stage of rotor blades. Comparison of the predicted erosion rate with the measured data obtained from the practical steam turbine operated for more than 90,000 hours shows good agreement.

Keywords

References

  1. Adler, W. F., 1995, 'Particulate Impact Damage Predictions,' Wear, Vol. 186-187, pp. 35-44 https://doi.org/10.1016/0043-1648(95)07177-6
  2. Drahy, J., 1988, 'Water Droplet Erosion of Titanium Alloy Steam Turbine Blading,' Proc. of EPRI Workshop on Titanium Steam Turbine Blading, Palo Alto, CA., pp. 405-426
  3. Field, J. E., 1999, 'Liquid Impact : Theory, Experiment, Applications,' Wear, Vol. 233-235, pp. 1-12 https://doi.org/10.1016/S0043-1648(99)00189-1
  4. Gelfand, B. E., 1996, 'Droplet Breakup Phenomenon in Flows with Belocity Lag,' Prog. Energy Combust. Sci., Vol. 22, pp. 201-265 https://doi.org/10.1016/S0360-1285(96)00005-6
  5. Gerdes, C., Karimi, A. and Bieler, H. W., 1995, 'Water Droplet Erosion and Microstructure of Laser-Nitrided Ti-6AI-4V,' Wear, Vol. 186-187, pp. 368-674 https://doi.org/10.1016/0043-1648(95)07153-9
  6. Krzyzanowski, J., Kowalski, A. E. and Shubenko, A. L., 1994, 'Some Aspects of Erosion Prediction of Steam Turbine Blading,' ASME J. Engineering for Gas Trubines and Power, Vol. 116, pp. 442-451 https://doi.org/10.1115/1.2906841
  7. Krzyzanowski, J. and Szprengiel, Z., 1978, 'The Influence of Droplet Size on the Turbine Blading Erosion Hazard,' ASME J. Engineering for Power, Vol. 100, pp. 561-565 https://doi.org/10.1115/1.3446394
  8. Leyzerovich, A., 1997, 'Large Power Steam Turbine : Design and Operation,' PennWell Books
  9. Oeynhausen, H., Bergmann, D. and Termuehlen, H., 1993, 'Large Steam Turbines for Advanced Power Plants,' Proc. of American Power Conference, Chicago, Illinois, April 13-15, pp. 1-13
  10. Robinson, J. M. and Reed, R. C., 1995, 'Water Droplet Erosion of Laser Surface Treated Ti-6 Al-4V,' Wear, Vol. 186-187, pp. 360-367 https://doi.org/10.1016/0043-1648(95)07131-8
  11. Ruml, Z. and Straka, F., 1995, 'A New Model for Steam Trubine Blade Materials Erosion,' Wear, Vol. 186-187, pp. 421-424 https://doi.org/10.1016/0043-1648(95)07164-4
  12. Schofield, P., 1997, 'SteamTurbine Sustained Efficiency,' GER-3750C, Technical Report of GE Power Systems
  13. Stanisa, B. and Ivusic, V., 1995, 'Erosion Behaviour and Mechanisms for Steam Turbine Rotor Blades,' Wear, Vol. 186-187, pp. 395-400 https://doi.org/10.1016/0043-1648(95)07136-9
  14. Tsubouchi, K., Yasugahira, N., and Yoshida, S., 1990, 'An Evaluation of Water Droplet Erosion for Advanced Large Steam Turbine.' PWR-Vol 10, Advances in Steam Turbine Technology for Power Generation, Book No. G00518, pp. 245-251