Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Optimization of sidewalls for a Double-Passage Cascade Experiment

2피치 유로 캐스케이드 실험을 위한 벽면 최적화에 관한 연구

  • 조종현 (경상대학교 항공공학과 대학원) ;
  • 안국영 (한국기계연구원, 환경기계연구부) ;
  • 조수용 (경상대 항공기부품기술연구센터)
  • Published : 2008.10.04
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Abstract

In a linear cascade experimental apparatus, when it adopts only few blades as well as satisfies the periodic condition between blades, it gives several advantages in experiment. In this study, wall design on a cascade experimental apparatus is conducted to obtain the periodic condition on two blades installed within a passage of which the width is double pitch. The Mach number difference on the blade surface obtained with the periodic and wall condition is chosen as an objective function, and twelve design variables which are related to the wall shape are selected. A wall shape is designed using a gradient-based optimization method. Adjustment of range and weighting function are applied to calculate the objective function to avoid unrealistic evaluation of the objective function. By applying these methods, the computed results show same flow structures obtained with the periodic condition.

선형 캐스케이드 실험장치에서 블레이드간에 주기조건을 만족하면서 적은 개수의 블레이드를 적용하는 것은 실험의 정확도 향상뿐만 아니라 실험수행에 여러 장점을 제공한다. 따라서 본 연구에서는 유로를 캐스케이드 피치의 두 배 넓이로 설정하고 두 개의 블레이드만을 설치하였을 때 주기조건이 얻어지도록 하는 벽면의 형상설계에 관한 연구를 수행하였다. 이를 위하여 주기조건에서 얻어진 블레이드 표면에서의 마하수와 동일한 결과가 얻어지도록 목적함수를 설정하였으며, 설계변수로는 벽면의 형상과 관련이 있는 12개의 변수를 선정하였다. 벽면의 설계를 위하여 기울기 기반의 최적화법을 사용하였으며, 목적함수에 민감한 변화를 나타내는 영역의 조정과 가중치를 사용하였다. 이러한 방식으로 얻어진 결과에서 주기조건과 동일한 유동특성이 얻어질 수 있음을 확인하였다.

Keywords

References

  1. Dornberger, R., Stoll, P., Buche, D. and Neu, A., 2000, 'Multidisciplinary Turbomachinery Blade Design Optimization', AIAA Paper No. 2000-0838
  2. Giess, P. A. and Kost, F., 1997, 'Detailed Experimental Survey of the Transonic Flow Field in a Rotating Turbine Cascade', 2nd European Conference on Turbomachinery-Fluid Dynamics and Thermodynamics, Antwerpen Belgium, March 3-7
  3. Lang, H., Morck, T., and Woisetschlager, J., 2002, 'Stereoscopic Particle Image Velocimetry in a Transonic Turbine Stage', Exp. Fluids, Vol. 32 pp. 700-709 https://doi.org/10.1007/s00348-002-0427-6
  4. Giel, P. W., Van Fossen, G. J., Boyle, R. J., Thurman, D. R., and Civinskas, K. C., 1999, 'Blade Heat Transfer Measurements and Predictions in a Transonic Turbine Cascade', NASA/TM-1999-209296
  5. Baughn, J. W., Butler, R. J., Byerley, A. R., and River, R. B., 1995, 'An Experimental Investigation of Heat Transfer, Transition and Separation on Turbine Blade at Low Reynolds Number and High Turbulence Intensity', ASME Paper No. 95-WA/HT-25
  6. Hollen, B. and Jacob, J., 2001, 'Experimental Investigation of Separation on Low Pressure Turbine Blades', AIAA Paper No. 2001-0447
  7. Erhard, J. and Gehrer, A., 2000, 'Design and Construction of a Transonic Test-Turbine Facility', ASME Paper No. 2000-GT-0480
  8. Sanz, W., Gehrer, A., Woisetschlager, J., Forstner, M., Artner, W., and Jericha, H., 1998, 'Numerical and Experimental Investigation of the Wake Flow Downstream of a Linear Turbine Cascade', ASME Paper No. 98-GT-246
  9. Buck, F. A. and Prakash, C., 1995, 'Design and Evaluation of a Single Passage Test Model to Obtain Turbine Airfoil Film Cooling Effectiveness Data', ASME Paper No. 95-GT-19
  10. Radomsky, R. W. and Thole, K. A., 2000, 'Flowfield Measurements for a Highly Turbulent Flow in a Stator Vane Passage', J. Turbomachinery. Vol. 122, pp. 252-262
  11. Kodzwa, P. M., Elkins, C. L. and Eaton, J. K., 2003, 'Measurements of Film Cooling Performance in a Transonic Single Stage Passage Model', 2nd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Zambia
  12. Ott, P., Norryd, M. and Bolcs, A., 1998, 'The Influence of Tailboards on Unsteady Measurements in a Linear Cascade', ASME Gas Turbine and Aeroengine Congress
  13. Laskowski, G. M., Vicharelli, A., Medic, G., Elkin, C. J., Eaton, J. K. and Durbin, P. A., 2005, 'Inverse Design and Experimental Measurements in a Double-Passage Transonic Turbine Cascade Model', J. Turbomachinery, Vol. 127, pp. 619-626 https://doi.org/10.1115/1.1929810
  14. 조종현, 조봉수, 김재실, 조수용, 2008, '2피치 유로의 캐스케이드 모델을 위한 벽면설계에 관한 연구', 한국항공우주학회지, Vol.36, No.8, pp. 797-806 https://doi.org/10.5139/JKSAS.2008.36.8.797
  15. Kiock, R., Lehthaus, F., Baines, N. C. and Sieverding, C. H., 1986, 'The Transonic Flow Through a Plane Turbine Cascade as Measured in Four European Wind Tunnels', J. Engineering for Gas Turbines and Power, Vol. 108, pp. 277-284 https://doi.org/10.1115/1.3239900
  16. Visual DOC Reference Manual Version 6.0, 2006, Vanderplaats R&D Inc.
  17. CFX-11, 2007, version 11