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http://dx.doi.org/10.3795/KSME-B.2005.29.1.046

2-Dimensional Film Cooling Characteristics with the Height Variation of a Stepped Slot Exit  

Son, Chang-Ho (울산대학교 기계자동차공학부)
Kim, Tae-Mook (울산대학교 대학원 기계자동차공학부)
Lee, Geun-Sik (울산대학교 기계자동차공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.1, 2005 , pp. 46-54 More about this Journal
Abstract
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.
Keywords
Film Cooling; Stepped Slot Exit; Blowing Ratio; Injection Angle; Turbulent Kinetic Energy;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 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   DOI
2 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
3 Rodi, W., 1984, Turbulence Models and Their Application in Hydraulics, pp. 66-67
4 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
5 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   과학기술학회마을
6 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   DOI   ScienceOn
7 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
8 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
9 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
10 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   과학기술학회마을   DOI
11 Goldstein, R. J., 1971, 'Film Cooling,' Advances in Heat Transfer, pp. 321-379
12 Cho, H. H., 2000, 'Flow and Heat Transfer Characteristics in Film Cooling,' KSME Spring Annual Meeting 2000 on Fluid Engineering, pp. 61-79