Experimental Thermal Field Measurements of Film Cooling with Twisted Holes
An experimental study has been conducted to study the heat transfer characteristics within corrugation film cooling holes of different cross section area square, rectangular and circular. The experiments investigation for this paper have been performed using a thermal IR camera, and the flow field has been analyzed by numerical calculation using a commercial code (FLUENT) was utilized and the SST k- ω turbulence model. The effect of blowing ratio (0.5, 1.0, 1.5 and 2.0) and twisted film cooling holes angles (90°, 180°, 270° and 360°) were also considered. A duct flow enters into a twisted film cooling hole in a cross direction. For the corrugation film cooling hole, it is observed that the reattachment of separated flow and the vortices within the hole enhance considerably the heat/mass transfer around the holes entrance region. Results showed that the twisted film cooling holes performed better than the cylindrical hole. Also, the film cooling effectiveness and heat transfer coefficient for the corrugation holes were strongly affected by the angle of twisted film cooling holes of the corrugation hole. Results show the heat transfer enhancement range of (1.5-2.7) time of smooth film cooling holes. Experimental and numerical calculation of film cooling effectiveness is validated with pervious experimental results.
Copyright © 2015 Praise Worthy Prize - All rights reserved.
Bunker, R. S., A Review of Shaped Hole Turbine FilmCooling Technology. J. Heat Transfer, Vol. 127(Issue 4): 441-453, 2005.
R. J. Goldstein, R.J., Film Cooling, Advances in Heat Transfer. vol. 7: 321–379, 1971.
James D. Heidmann,. A Numerical Study of Anti-Vortex Film Cooling Designs at High Blowing Ratio. Turbo Expo 2008 Gas Turbine Technical Congress and Exposition sponsored by the American Society of Mechanical Engineers Berlin, Germany, NASA/TM—2008-215209, 2008.
Pedersen, D.R., Eckert, E.R.G., and Goldstein, R.J., Film Cooling With Large Density Differences Between the Mainstream and the Secondary Fluid Measured by the Heat-Mass Transfer Analogy. Journal of Heat Transfer, Vol. 99: 620–627, 1977.
Foster, N.W. and Lampard, D., The Flow and Film Cooling Effectiveness Following Injection Through a Row of Holes. Journal of Engineering for Power, Vol. 102: 584–588, 1980.
Pietrzyk, J.R., Bogard, D.G., and Crawford, M.E., Hydrodynamic Measurements of Jets in Crossflow for Gas Turbine Film Cooling Applications. Journal of Turbomachinery, Vol. 111: 139–145, 1989.
Pietrzyk, J.R., Bogard, D.G., and Crawford, M.E., Effects of Density Ratio on the Hydrodynamics of Film Cooling. Journal of Turbomachinery, Vol. 112: 437–443, 1990.
Sinha, A.K., Bogard, D.G., and Crawford, M.E., Film-Cooling Effectiveness Downstream of a Single Row of Holes with Variable Density Ratio. Journal of Turbomachinery, Vol. 113: 442–449, 1991.
Dhungel, S., Phillips, A., Ekkad, S.V., and Heidmann, J.D., Experimental Investigation of a Novel Anti-Vortex Film Cooling Hole Design. ASME Paper GT2007–27419, 2007.
Leylek, J.H., and Zerkle, R.D., Discrete-Jet Film Cooling: A Comparison of Computational Results With Experiments. Journal of Turbomachinery, Vol. 116: 358–368, 1994.
Haven, B.A., Yamagata, D.K., Kurosaka, M., Yamawaki, S., and Maya, T., Anti-Kidney Pair of Vortices in Shaped Holes and Their Influence on Film Cooling Effectiveness. ASME Paper 97– GT–45, 1997.
Lemmon, C.A., Kohli, A., and Thole, K.A., Formation of Counter-Rotating Vortices in Film-Cooling Flows. ASME Paper 99–GT–161, 1999.
Mostafa A. H., Tarek A. M., Samir S. A. and Karam M. E., An Investigation Of The Effect Of Anti-Vortex Film Cooling On A Flat Plate. Proceedings of ICFD 10:Tenth International Congress of Fluid Dynamics December 16-19, 2010, Stella Di Mare Sea Club Hotel, Ain Soukhna, Red Sea, Egypt,2010.
Menter, F. R., Zonal two-equation k-ω turbulence model for aerodynamic flows, AIAA Paper,1993.
Incropera, F. P. and DeWitt, D. P. Introduction to Heat Transfer, New York: John Wiley & Sons, 2002.
Kohli, A., and Bogard, D.G., Adiabatic Effectiveness, Thermal Fields, and Velocity Fields for Film Cooling with Large Angle Injection, ASME J. Turbomachinery, Vol.119, pp. 352-358, 1997.
Sinha, A.K., Bogard, D.G., Crawford, M.E., Film Cooling Effectiveness Downstream of a Single Row of Holes with Variable Density Ratio, ASME J. Turbomachinery, Vol. 113, pp. 442–449, 1991.
Please send any question about this web site to email@example.com
Copyright © 2005-2020 Praise Worthy Prize