Investigation of Effect Holes Twisted Angle and Compound Angle of Holes on Film Cooling Effectiveness
This paper investigates a new method of film cooling using swirling coolant flow through a rectangular twisted film cooling holes with spiral corrugated tube. Two different air flows with different temperatures were used in this study. Throughout the investigation, blowing ratio varied from 0.5 to 2.0 for several configurations of rectangular twisted angle of 0°, 90°, 180°, 270° and 360°. The results of cooling effectiveness obtained were compared against a standard untwisted tube. Results show that the overall thermal effectiveness improved significantly when the temperature difference between the air flows is at 25 degrees. Such improvement is supported by heat transfer enhancement that obtained from 19.7% to 57.4%. Based on these findings, the study concludes that using a specific geometry of film cooling holes with twisted configuration may result in an improve the convective heat transfer coefficient
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Foster, N. W., and Lampard, D., The flow and film cooling effectiveness following injection through a row of holes, Journal for Engineering for Power, Vol.102(3), pp.584-588, 1980.
Matthews, S., Shrouded plasma spray of Ni–20Cr coatings utilizing internal shroud film cooling, Surface and Coatings Technology, 249, 56-74, 2014.
Terzis, A., Kazakos, C., Kalfas, A., Zachos, P. K., Pilidis, P., and Papadopoulos, N., Effects of swirl velocities from fan assemblies mounted on lifting surfaces, Journal of Engineering for Gas Turbines and Power, Vol. 133(3), 031702, 2011.
Abdullah, K., Funazaki, K. I., Onodera, H., and Ideta, T., Experimental Investigations on Aero-Thermal Interaction of Film Cooling Airs Ejected from Multiple Holes: Shallow Hole Angle, In ASME Turbo: Turbine Technical Conference and Exposition, . American Society of Mechanical Engineers, pp. 1209-1222, 2012.
Li, X., and Wang, T., Effects of various modeling schemes on mist film cooling simulation, Journal of heat transfer, Vol.129(4), 472-482, 2007.
Jiang, Y., Zheng, Q., Yue, G., Dong, P., Gao, J., and Yu, F., Conjugate heat transfer simulation of turbine blade high efficiency cooling method with mist injection, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 0954406214522436, 2014.
Yu, Z., Xu, T., Li, J., Xu, T., and Yoshino, T., Computational analysis of droplet mass and size effect on mist/air impingement cooling performance, Advances in Mechanical Engineering, 2013.
Pamula, G., Ekkad, S. V., and Acharya, S., Influence of crossflow-induced swirl and impingement on heat transfer in a two-pass channel connected by two rows of holes, Journal of turbomachinery, Vol.123(2), pp. 281-287, 2001.
Sakai, E., Takahashi, T., and Agata, Y., Experimental Study on Effects of Internal Ribs and Rear Bumps on Film Cooling Effectiveness, Journal of Turbomachinery, Vol. 135(3), 031025, 2013.
Tao, Z., Li, G., Deng, H., Xiao, J., Xu, G., and Luo, X., Film Cooling Performance in a Low-Speed 1.5-Stage Turbine: Effects of Blowing Ratio and Rotation, Journal of Enhanced Heat Transfer, Vol. 18 (5),2011.
M.G. Ghorab, An experimental investigation of film cooling performance of louver scheme, ScienceDirect, International Journal of Heat and Mass Transfer, Vol. 54, pp.1387–1399, 2011.
Lavine, A. S., Incropera, F. P., & Dewitt, D. P., Introduction to heat transfer, John Wiley & Sons, Incorporated, 2011.
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 and Sons, 2002.
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