DOI QR코드

DOI QR Code

Numerical Study About the Effect of the Low Reynolds Number on the Performance in an Axial Compressor

저 레이놀즈 수가 압축기 성능에 미치는 영향에 대한 수치적 연구

  • 최민석 (포항공과대학교 대학원 기계공학과) ;
  • 정희택 (경상대학교 기계항공공학부) ;
  • 오성환 (국방과학연구소) ;
  • 고한영 (국방과학연구소) ;
  • 백제현 (포항공과대학교 기계공학과)
  • Published : 2008.02.05

Abstract

A three-dimensional computation was conducted to understand effects of the low Reynolds number on the performance in a low-speed axial compressor at the design condition. The low Reynolds number can originates from the change of the air density because it decreases along the altitude in the troposphere. The performance of the axial compressor such as the static pressure rise was diminished by the separation on the suction surface with full span and the boundary layer on the hub, which were caused by the low Reynolds number. The total pressure loss at the low Reynolds number was found to be greater than that at the reference Reynolds number at the region from the hub to 85% span. Total pressure loss was scrutinized through three major loss categories in a subsonic axial compressor such as the profile loss, the tip leakage loss and the endwall loss using Denton#s loss model, and the effects of the low Reynolds number on the performance were analyzed in detail.

Keywords

References

  1. Weinberg, M. and Wyzykowski, J., 2001, 'Powering Unmanned Air Craft,' Aerospace Engineering, November 2001, pp. 23~26
  2. Castner, R., Chiappetta, S., Wyzykowski, J. and Adamczyk, J., 2002, 'An Engine Research Program Focused on Low Pressure Turbine Aerodynamic Performance,' ASME Paper, GT-2002-30004
  3. Schreiber, H.-A., Steinert, W. and Kusters, B., 2000, 'Effects of Reynolds Number and Free-Stream Turbulence on Boundary Layer Transition in a Compressor Cascade,' Journal of Turbomachinery, Vol. 124, pp. 1~9 https://doi.org/10.1115/1.1413471
  4. Van Treuren, K. W., Simon, T., Von Koller, M., Byerley, A. R., Baughn, J. W. and Rivir, R., 2002, 'Measurements in a Turbine Cascade Flow under Ultra Low Reynolds Number Conditions,' Journal of Turbomachinery, Vol. 124, pp. 100~106 https://doi.org/10.1115/1.1415736
  5. Matsunuma, T., 2006, 'Effects of Reynolds Number and Freestream Turbulence on Turbine Tip Clearance Flow,' Journal of Turbomachinery, Vol. 128, pp. 166~177 https://doi.org/10.1115/1.2103091
  6. Matsunuma, T. and Tsutsui, Y., 2005, 'Effects of Low Reynolds Number on Wake-Generated Unsteady Flow of an Axial-Flow Turbine Rotor,' Int. J. of Rotating Machinery, Vol.2005, No.1, pp. 1~15 https://doi.org/10.1155/IJRM.2005.1
  7. Denton, J. D., 1993, 'Loss Mechanisms in Turbomachines,' Journal of Turbomachinery, Vol. 115, pp. 621~656 https://doi.org/10.1115/1.2929299
  8. Wagner, J. H., Dring, R. P. and Joslyn, H. D., 1983, 'Axial Compressor Middle Stage Secondary Flow Study,' NASA CR-3701
  9. Choi, M., Park, J. Y. and Baek, J. H., 2005, 'Effects of the Inlet Boundary Layer Thickness on the Flow in an Axial Compressor . Part 1, 2,' Trans. of KSME(B), Vol. 29, No. 8, pp. 948~962
  10. Park, J. Y., Chung, H. T. and Baek, J. H., 2003, 'Effects of Shock-Wave on Flow Structure in Tip Region of Transonic Compressor Rotor,' Int. J. of Turbo & Jet Engines, Vol. 20, No. 1, pp. 41~62
  11. Park, J. Y., Choi, M. S. and Baek, J. H., 2003, 'Effects of Axial Gap on Unsteady Secondary Flow in One-stage Axial Turbine,' Int. J. of Turbo & Jet Engines, Vol. 20, No. 4, pp. 315~333
  12. Van Leer, 1982, 'Flux Vector Splitting for the Euler Equations,' Lecture Notes in Physics, Springer-Verrlag, New York, Vol. 170, pp. 507~512 https://doi.org/10.1007/3-540-11948-5_66
  13. Baldwin, B. S. and Lomax, H., 1978, 'Thin Layer Approximation and Algebraic Model for Separated Turbulent Flows,' AIAA Paper 78-257
  14. U. S. Standard Atmosphere, http://modelweb.gsfc. nasa. gov/atmos/us_standard.html
  15. Levy, Y., Degani, D. and Seginer, A., 1990, 'Graphical Visualization of Vortical Flows by Means of Helicity,' AIAA Journal, Vol. 28, No. 8, pp. 1347~1352 https://doi.org/10.2514/3.25224
  16. Denton, J. D. and Cumpsty, N. A., 1987, 'Loss Mechanisms in Turbomachines,' ImechE Paper No. C260/87