Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
권호 표지
DOI QR코드

DOI QR Code

Characteristics of Blade Force by Nozzle Passing Steam

노즐 통과 증기에 의한 블레이드에 작용하는 힘 특성

  • Lee, Byounghak (Korea Hydro and Nuclear Power Co., LTD.) ;
  • Park, Jongho (Dept. of Mechanical Engineering Chungnam National University)
  • Received : 2013.07.17
  • Accepted : 2013.10.04
  • Published : 2013.10.20
Download PDF
⟨ Previous Next ⟩

Abstract

Last blades of LP turbine in nuclear power plant are the highly damaged part and suffered from nozzle steam impulses during the turbine operation. Nozzle impulse is known as a common cause of damage or failure in the turbine blade and results from steam flow distortions due to uneven steam flow patterns between the stationary blade vanes. If impulse force was continuously acting on the blade for a long time, crack or wear will occur in weak parts such as root. So, it is important to know variation of nozzle impulse during the blade moving. But there is no way to measure and estimate the magnitude and direction of nozzle impulse. Therefore, this study was performed to know the variation of nozzle impulse force according to the positions of the blade and to obtain blade equivalent force and torque. This results can be used for blade stress estimation.

Keywords

References

  1. Murari, S. and George, L., 2011, Blade Design & Analysis For Steam Turbine, McGraw-Hill Professional, New York.
  2. William, P. and Sanders, P., 1999, Turbine Steam Path Volume1 Maintenance & Repair, PennWell, Tulsa.
  3. Yang, K. H. and Song, O. S., 2009, Vibration of Dynamic Characteristics of a Low Pressure Turbine Blade with Crack Length, Transactions of the Korean Society for Noise and Vibrations Engineering, Vol. 19, No. 12, pp. 1281-1288. https://doi.org/10.5050/KSNVN.2009.19.12.1281
  4. Ha, H. C., Lee, D. J., Ryu, S. J. and Chung, H. C., 2000, Modification and Testing to Prevent the Resonance in a Finger-type Low Pressure Turbine Blade, Proceedings of the KSNVE Annual Autumn Conference pp. 612-617.
  5. Ha, H. C., Lee, D. J. and Ryu, S. J., 2001, An Experimental Study for Preventing the Resonance of Steam Turbine Blade, Transactions of the Korean Society for Noise and Vibrations Engineering, Vol. 11, No. 3, pp. 410-415.
  6. Petreski, Z. and Tasevski, G. M., 2009, Blade Group Resonant Stresses FEM Simulations.
  7. Grunsky, 2001, Guidelines for Reducing the Time and Cost of Turbine-generator Maintenance Overhauls and Inspections, Vol7 : Low-Pressure Blade/Disk Design Audits and Inspection Procedures, Final Report.
  8. Benner, M. W., Sjolander, S. A. and Moustaoha, S. H., 1997, Influence of Leading-edge Geometry on Profile Loss in Turbine as Off-design Incidence : Experimental Results and Improved Correlation, Journal of Turbomachinery Vol. 119, No. 2, pp. 193-200. https://doi.org/10.1115/1.2841101