Effect of Coolant Jet Direction on Film Cooling Behavior
Numerical investigations were done on a flat plate in order to predict the flow behavior, vortex type, and vortex generated at holes and holes downstream area, and the interaction between hot mainstream and coolant jet. Two type of singular coolant air jet were studied; the first jet hole inclined at 30º in the direction of hot air stream. The second holes are lying in the opposite direction at 30º. All simulation were conducted at blowing ratio of 0.5 and 1.5, the diameter of cooling hole is 4mm. The commercial CFD software FLUENT with standard turbulent models was applied. The results showed that there are two large vortices have been detected, large counter rotating vortex pair generated from the hole rims and horseshoe vortices, both vortices have major effects on cooling performance. The results also showed that the reverse flow from backward injection hole creates pair of vortex similar to the kidney vortex created from forward injection hole, but in a plane parallel to the main stream.
 Ahn, J., Jung, I.S., and Lee, J.S., “Film cooling from two rows of holes with opposite behavior and adiabatic film cooling effectiveness”, International Journal of Heat and Fluid Flow, Vol. 24, 2003, pp. 91-99.
 Dhungel, A., Phillips, A., Ekkad, S.V., and Heidmann, J.D., 2007, “Experimental Investigation of a Novel Anti-Vortex Film Cooling Hole Design”, ASME IGTI Turbo Expo, Montreal, Paper GT 2007-27419.
 Lu, Y.,Dhungel, A.,Ekkad, S.V., and Bunker, R.S., 2007, “Effect of Trench Width and Depth on Film Cooling from Cylindrical Holes Embedded in Trenches”, ASME Paper GT 2007-27388.
 Lu, Y., Dhungel, A., Ekkad, S.V., and Bunker, R.S., 2007, “Film Cooling Measurements for Cratered Cylindrical Inclined Holes”, ASME Paper GT 2007-27386.
 Dia, P. and Lin, F., 2011,“Numerical study on film cooling effectiveness from shaped and crescent holes”, Heat Mass Transfer, Vol. 47, PP. 147-154.
 Lee, K.D. and Kim, K.Y., 2011,“Surrogate based optimization of a laidback fan-shaped hole for film-cooling”, International Journal of Heat and Mass Transfer, Republic of Korea, Vol. 32, PP. 226-238.
 Alwan, M. Sh., 2012,” Experimental and Numerical Investigation of Film Cooling Thermal Performance for Staggered Rows of Circular Jet” PhD thesis, Mechanical Engineering Department , University of Technology.
 Holman, J.P. and Bhattacharyya, S., “Heat Transfer”, Ninth Edition, New Delhi, McGraw-Hill, 2008.
 Ekkad, S.V., Ou, S., and Rivir, R.V., “A Transient Infrared Thermography Method for Simultaneous Film Cooling Effectiveness and Heat Transfer Coefficient Measurements from a single test”, GT 2004-54236, Proceedings of ASME Turbo Expo 2004, Vienna, Austria.
 Ekkad, S.V., and Zapata, D., “Heat transfer coefficients Over a Flat Surface with Air and CO2 Injection Through Compound Angle Holes Using a Transient Liquid Crystal Image Method”, ASME Journal of Turbomachinery Vol. 119, No. 3, 1997, pp. 580-586.
 Albert, J.E., Cunha, F. and Bogard, D.G., 2004, “Adiabatic and Overall Effectiveness for a Film Cooling Blade”, ASME Paper GT2004-53998.
 Kline, S.J. and McClintock, F.A., 1953, “Describing uncertainties in single sample experimental”, Mechanical Engineering, Vol. 75, pp. 3-8.
 Versteeg, H.K. and Malalasekera, W., 1996, “An introduction to computational fluid dynamics the finite volume method”, Longman Group, London.
 Ozturk E., 2004, “CFD analysis of heat sinks for CPU cooling with FLUENT”, MSc thesis, graduate school of natural and applied sciences, Middle East Technical University.
 Jones, D.A. and Clarke, D.B., 2005, “Simulation of a wind-body junction experiment using the fluent code”, DSTD-TR-1731, Australia.
الحقوق الفكرية (c) 2022 Asst. Prof. Dr. Muwafaq Shyaa Alwan; Asst. Prof. Dr. Amer M. Al-Dabagh, Asst. Lect. Omar Hassan Hameed
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