Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
권호 표지
DOI QR코드

DOI QR Code

Improvement of the Aerothermal Environment for a 90° Turning Duct by an Endwall Boundary Layer Fence

90° 곡관에서의 경계층 판을 이용한 열유동 환경 개선

  • 조종재 (부산대학교 대학원 항공우주공학과) ;
  • 김귀순 (부산대학교 항공우주공학과)
  • Received : 2011.07.19
  • Accepted : 2011.01.11
  • Published : 2012.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

An endwall boundary layer fence technique was adapted to improve the aerothermal environment of a gas turbine passage. The shape optimization of the fence was performed to maximize the improvement. The turbine passage was simulated by a $90^{\circ}$ turning duct (ReD=360,000). The main purpose of the present investigation was to focus on finding a endwall boundary layer fence with minimum total pressure loss in the passage and heat transfer coefficient on the endwall of the duct. Anothor objective function was to minimize the area on the endwall of the duct. An approximate optimization method was used for the investigation to secure the computational efficiency. Results indicated that a significant improvement in aerodynamic environment can be achieved through the application of the fence. Improvement of the thermal environment was smaller than that of the aerodynamic enviroment.

본 논문에서는 가스터빈 유로의 열유동 환경을 개선하기 위해 끝벽면 경계층 판을 이용한 방법을 적용하였으며, 이 방법에 의한 효과를 최대화하기 위해 경계층 판의 형상에 대한 최적화를 수행하였다. 터빈 유로를 모사하기 위해 $90^{\circ}$ 곡관을 이용하였다. 터빈 유로에서의 전압력 손실과 유로 끝벽면에서의 열전달 계수, 그리고 끝벽면 면적을 최소화하는 �微蛙� 판 형상 도출을 연구의 목적으로 하였으며, 최적화 과정의 효율성을 위해 근사 최적화 기법을 적용하였다. 연구결과를 통해, 최적화된 경계층 판에 의한 상당한 공력환경 개선을 확인할 수 있었으며, 열환경 개선 정도는 공력환경 개선정도에 비해 작게 나타났다.

Keywords

References

  1. Kawai, T., Shinoki, S. and Adachi, T., "Secondary Flow Control and Loss Reduction in a Turbine Cascade Using Endwall Fences," JSME International Journal, Series 11, Vol. 32, No. 3, 1989, pp.375-387
  2. Chung, J.T. and Simon, T.W., "Effectiveness of the Gas Turbine Endwall Fences in Secondary Flow Control at Elevated Freestream Turbulence Levels," 93-GT-51, International Gas Turbine and Aeroengine Congress and Exposition, Cincinnati, Ohio, 1993
  3. Moon, Y. J., Koh, S. R., "Counter-rotating streamwise vortex formation in the turbine cascade with endwall fence," Computers & Fluids, Vol. 30, Issue 4, 2001, pp.473-490 https://doi.org/10.1016/S0045-7930(00)00026-8
  4. Camci, C., Rizzo, D. H., "Secondary flow and forced convection heat transfer near endwall boundary layer fences in a $90^{\circ}$ turning duct," International Journal of Heat and Mass Transfer, Vol. 45, 2002, pp.831-843 https://doi.org/10.1016/S0017-9310(01)00181-8
  5. Ko, T. H., "A numerical study on entropy generation and optimization for laminar forced convection in a rectangular curved duct with longitudinal ribs," International Journal of Thermal Sciences, Vol. 45, 2006, pp.1113-1125 https://doi.org/10.1016/j.ijthermalsci.2006.03.003
  6. iSIGHT Designer's Guide, Version FD 3.1, Engineous Software, Inc., 2008
  7. Gambit I Modeling Guide, Fluent Inc., 2004
  8. Fluent User's Guide, Version 6.3, Fluent Inc., 2006
  9. Wiedner, B. G. and Camci, C., "Passage Flow Structure and its Influence on Endwall Heat Transfer in a 90° Turning Duct: Mean Flow and High Resolution Endwall Heat Transfer Experiments," Journal of Turbomachinery, Vol. 119, No. 1, 1997, pp.39-50 https://doi.org/10.1115/1.2841009
  10. van Leer, B., "Towards the Ultimate Conser- vative Difference Scheme, V. A Second Order Sequel to Godunov's Method," J. Com. Phys., Vol. 32, 1979, pp.101-136 https://doi.org/10.1016/0021-9991(79)90145-1
  11. Yakhot, V., Orszag, S., Thangman, S., Gatski, T. B. and Speziale, C. G., "Development of Turbulence Models for Shear Flows by a Double Expansion Technique," Physics of fluids. A, Fluid dynamics, Vol. 4, No. 7, 1992, pp.1510-1520 https://doi.org/10.1063/1.858424
  12. Zess, G. A., and Thole, K. A., "Computational Design and Experimental Evaluation of Using a Leading Edge Fillet on a Gas Turbine Vane," Journal of Turbomachinery, Vol. 124, 2002, pp.167-175 https://doi.org/10.1115/1.1460914
  13. Kim, S. E. and Choudhury, D. A., "Near-Wall Treatment Using Wall Functions Sensitized to Pressure Gradient," ASME FED, Vol. 217, 1995
  14. Iman, R. L., Davenport, J. M. and Zeigler, D. K., "Latin hypercube sampling (program user's guide)," OSTI 5571631., 1980
  15. Myers, R. H. and Montgomery, D. C., "Response Surface Methodology - Process and Product Optimization Using Designed Experiments," John Wiley & Sons, New York, 1995
  16. Taylor, A.M.K.P., Whitelaw, J.H. and Yianneskis, M., "Curved Ducts With Strong Secondary Motion: Velocity Measurements of Developing Laminar and Turbulent Flow," ASME Journal of Fluids Engineering, Vol. 104, 1982, pp.350-359 https://doi.org/10.1115/1.3241850