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계단형 슬롯출구의 높낮이 변화에 따른 2차원 막냉각 특성
2-Dimensional Film Cooling Characteristics with the Height Variation of a Stepped Slot Exit

손창호   (울산대학교 기계자동차공학부UU0001014  ); 김태묵   (울산대학교 대학원 기계자동차공학부UU0001014  ); 이근식   (울산대학교 기계자동차공학부UU0001014  );
  • 초록

    Film cooling characteristics has been examined numerically for the height variation of a stepped slot exit. In this study, the upstream wall height of the stepped slot exit varies from -2d (d = slot width) to 3d, blowing ratio ranges from 0.5 to 3, and injection angles are $15^{\circ},\;30^{\circ},\;and\;45^{\circ}$ . The results showed that film cooling performance was mainly subjected to the magnitude of recirculation region near the downstream-side slot exit as well as the magnitude and the distribution region of turbulent kinetic energy due to the local velocity and momentum differences between the coolant and the main flow near the slot exit. The up-1d type slot at higher blowing ratios over 2 and the flat type slot at lower blowing ratios below 1 have the best film cooling performances, in case of the injection angles of $30^{\circ},\;and\;45^{\circ}$ , respectively. Compared with the other injection angles, in case of the injection angles of $15^{\circ}$ , the best film cooling performances was shown in even a higher upstream wall (up-3d) at higher blowing ratio like 3 by the gradual reduction of the coolant velocity which minimizes the local velocity differences between the coolant and the main flow near the slot exit.


  • 주제어

    막냉각 .   계단형 슬롯출구 .   분사비 .   분사각 .   난류운동에너지.  

  • 참고문헌 (12)

    1. Goldstein, R. J., 1971, 'Film Cooling,' Advances in Heat Transfer, pp. 321-379 
    2. Cho, H. H., 2000, 'Flow and Heat Transfer Characteristics in Film Cooling,' KSME Spring Annual Meeting 2000 on Fluid Engineering, pp. 61-79 
    3. Lee, H.-W., Park, J. J. and Lee, J. S., 2000, 'Flow Visualization and Film Cooling Effectiveness Measurement Around Shaped Holes with Compound Angle,' Recent Advances in Transport Phenomena (12th ISTP), Elsevier, pp. 45-50 
    4. Son, C. H., Lee, G. S., Won, Y. H., Rho, S. M. and Lee, J. C., 2001, 'A Study on the Combination of Blowing Ratio and Injection Angle in 2-Dimensional Film Cooling,' Proc. KSME 2001 Spring Annual Meeting (D), Jeju, Korea, pp. 553-558 
    5. Rhee, D. H., Kim, B. and Cho, H. H., 1999, 'Characteristics of Heat/Mass Transfer Around a Shaped Film Cooling Hole,' Trans. of the KSME (B), Vol. 23, No.5, pp. 577-586 
    6. Kim, Y. B., Rhee, D. H., Lee, Y. S. and Cho, H. H., 2004, 'The Effects of Staggered Rows of Rectangular Shaped Holes on Film Cooling,' Trans. of the KSME (B), Vol. 28, No.3, pp. 304-314     
    7. Rho, S. M., Son, C. H. and Lee, G. S., 2001, 'Film Cooling Characteristics with Sunk or Lifted Upstream Wall,' Proc. KSME 2001 Spring Annual Meeting (D), Jeju, Korea, pp. 377-381 
    8. Shih, T.-H., Liou, W. W., Shabbir, A. and Zhu, J., 1995, 'A New $k-{\varepsilon}$ Eddy-Viscosity Model for High Reynolds Number Turbulent Flows - Model Development and Validation,' Computers Fluids, Vol. 24, No.3, pp. 227-238 
    9. Yang, H. C., Ryou, H. S. and Lim, J. H., 1997, 'A Study of Applicability of a RNG $k-{\varepsilon}$ Model,' Trans. of the KSME (B), Vol. 21, No. 21, pp. 1149-1164     
    10. Kim, J., Kline, S. J. and Johnston, J. P., 1980, 'Investigation of a Reattaching Turbulent Shear Layer : Flow over a 'Backward-Facing Step,' ASME J. of Fluids Engineering, Vol. 102, pp. 302-308, September 
    11. Mikhail, R., Chu, V. H. and Savage, S. B., 1975, 'The Reattachment of a Two-Dimensional Turbulent Jet in a Confined Cross Flow,' Pro. 16th IAHR Congress, Sao Paulo, Vol. 3, pp. 414-419 
    12. Rodi, W., 1984, Turbulence Models and Their Application in Hydraulics, pp. 66-67 
  • 이 논문을 인용한 문헌 (4)

    1. Lee, Jun ; Kim, Yoo 2009. "Capability of Turbulence Modeling Schemes on Estimating the Film Cooling at Parallel Wall Jet-Nozzle Configuration" 한국추진공학회지 = Journal of the Korean Society of Propulsion Engineers, 13(1): 10~18     
    2. Nguyen, Van Hap ; Lee, Geun Sik 2015. "Design and Analysis of a Radial Turbine for Ocean Thermal Energy Conversion" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 39(3): 207~214     
    3. Kim, Sang-Min 2016. "Numerical Study on the Effect of Injection Nozzle Shape on the Cooling Performance in Supersonic Film Cooling" 韓國航空宇宙學會誌 = Journal of the Korean society for aeronautical & space sciences, 44(8): 641~648     
    4. Kim, Manshik ; Lee, Dong Min 2017. "An Experimental Study of Film Cooling Characteristics at Supersonic Free Stream Conditions" 韓國航空宇宙學會誌 = Journal of the Korean society for aeronautical & space sciences, 45(4): 342~348     

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