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Effect of protrusion shape on film cooling performance for the cylindrical hole embedded in a contoured crater

ABSTRACT
The cratered film-cooling hole is regarded as one of the potential applications with high cooling performance and low cost. This study focuses on the influence of the protrusion shape for the contoured crater embedded in the cylindrical hole. Four protrusion shapes, i.e., arc, rectangle, trapezoid, and triangle, are considered. The cooling effectiveness, flow structure, and aerodynamic loss for the cratered holes at blowing ratios of 0.5-2.5 are obtained using the numerical method with the Shear Stress turbulence model. The numerical results indicate that the arc and triangle protrusion models provide better lateral coolant coverage and higher area-averaged cooling effectiveness at higher blowing ratios, attributed to the ascendant anti-kidney-shaped vortex pair. The rectangle protrusion model provides the lowest area-averaged cooling effectiveness because the kidney-shaped vortex pair dominates the downstream flow field. For the aerodynamic loss, the largest total pressure loss coefficient occurs for the rectangle protrusion model and nearly equivalent values for the other three protrusion models. The contoured cratered holes with arc and triangle protrusions are generally recommended.
KEYWORDS
PAPER SUBMITTED: 2022-04-15
PAPER REVISED: 2022-07-02
PAPER ACCEPTED: 2022-08-01
PUBLISHED ONLINE: 2022-09-10
DOI REFERENCE: https://doi.org/10.2298/TSCI220415126W
REFERENCES
  1. Goldstein, R.J., Film Cooling, Adv. Heat Transf, (1971), 7, pp. 321-379
  2. Sinha, A.K., et al., Film-cooling effectiveness downstream of a single row of holes with variable density ratio, ASME J, Turbomach, 113 (1991), 3, pp. 442-449
  3. Goldstein, R.J., et al., Film cooling effectiveness and mass/heat transfer coefficient downstream of one row of discrete holes, ASME J. Turbomach, 121 (1999), 2, pp. 225-232
  4. Baldauf, S., et al., High-resolution measurements of local effectiveness from discrete hole film cooling, ASME J. Turbomach, 123 (2001), 4, pp. 758-765
  5. Abdelmohimen, M.A.H, et al., Numerical analysis of film cooling due to simple/compound angle hole combination, Arabian J. Sci. Eng, (2020), 45, pp. 8931-8944
  6. Wang, J., et al., Effect of spherical blockage configurations on film cooling, Therm. Sci., 22 (2018), 5, pp. 1933-1942
  7. Taheria, Y., et al., Multi-objective optimization of three rows of film cooling holes by genetic algorithm, Therm. Sci., 25(2021), 5, pp. 3531-3541
  8. Goldstein, R.J., et al., Effects of hole geometry and density on three-dimensional film cooling, Int. J. Heat Mass Transf, 17 (2015), 5, pp. 595-607
  9. Bunker, R.S., A review of shaped hole turbine film-cooling technology, ASME J. Heat Transf, 127 (2005), 4, pp. 441-453
  10. Ping, D., Feng, L., Numerical study on film cooling effectiveness from shaped and crescent holes, Numer. Heat Transf, 47 (2011), 2, pp. 147-154
  11. Lee, K.D., Kim, K.Y., Performance evaluation of a novel film-cooling hole, ASME J. Heat Transf, 134 (2012), 10, Article number. 101702
  12. Kusterer, K., et al., Highest-efficient film cooling by improved nekomimi film cooling holes - part 1: ambient air flow conditions, Proceedings, ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, San Antonio, Texas, USA, 2013, Vol. 3B, V03BT13A040
  13. Tian, K., et al., Effect of combined hole configuration on film cooling with and without mist injection, Therm. Sci., 22 (2018), 5, pp. 1923-1931
  14. Krishna A.V.G., Parammasivam K.M., Thermal barrier coated surface modifications for gas turbine film cooling: a review, J. Therm. Anal. Calorim, 146 (2021), 5, pp. 545-580
  15. Bunker, R.S., Film cooling effectiveness due to discrete holes within a transverse surface slot, Proceedings, ASME Turbo Expo 2002: Power for Land, Sea, and Air, Amsterdam, Netherlands, (2002), Vol. 3, pp. 129-138
  16. Fric, T.F., Campbell, R.P., Method for improving the cooling effectiveness of a gaseous coolant stream which flows through a substrate, and related articles of manufacture, U.S. Patent, (2002), No. 6383602
  17. Tran, N., et al., Prediction of adiabatic effectiveness of various cratered film hole configurations: sensitivity analysis for the rectangle shaped mask, arc.aiaa.org/doi/pdf/10.2514/6.2010-404
  18. Lu, Y., et al., Film cooling measurements for cratered cylindrical inclined holes, ASME J. Turbomach, 131 (2009), 1, pp. 43-54
  19. Khalatov, A., et al., Application of cylindrical, triangular and hemispherical dimples in the film cooling technology, J. Phys.: Conf. Ser, 891 (2017), 1, Article number. 012145
  20. Khalatov, A., et al., Film cooling evaluation of a single array of triangular craters, Int. J. Heat Mass Transf, 159 (2020), Article number. 120055
  21. Kalghatgi, P., Acharya, S., Improved film cooling effectiveness with a round film cooling hole embedded in contoured crater, ASME J. Turbomach, 137 (2015), 10, Article number. 101006
  22. Kalghatgi, P., Acharya, S., Flow dynamics of a film cooling jet issued from a round hole embedded in contoured crater, ASME J. Turbomach, 141 (2019), 8, Article number. 081006
  23. An, B.T., Film cooling effectiveness measurements of a near surface streamwise diffusion hole, Int. J. Heat Mass Transfer, 103 (2016), pp. 1-13
  24. Bai, L.C., Zhang, C., Flow mechanism of cooling effectiveness improvement for the cylindrical film cooling hole with contoured craters, IOP Conf. Ser.: Mater. Sci. Eng. 473 (2019), 1, Article number. 012033
  25. Fu, J.L., et al., Film cooling performance for cylindrical holes embedded in contoured craters: effect of the crater depth, J. Appl. Mech. Tech. Phys, 60 (2019), 6, pp. 1068-1076
  26. Bai, L.C., et al., Optimization of geometric parameters of cylindrical film cooling hole with contoured craters to enhance film-cooling effectiveness, Thermophys. Aeromech, 28 (2021), 6, pp. 835-848
  27. Zhang, C., et al., Discharge coefficients and aerodynamic losses for cylindrical and cratered film-cooling holes with various coolant crossflow orientations, J. Braz. Soc. Mech. Sci. Eng, 43 (2021), 3, Article number, 161
  28. Menter, F.R., Two-equation eddy-viscosity turbulence models for engineering applications, AIAA J, 32 (1994), 8, pp. 1598-1605
  29. Bai, L.C., Research on optimization design and thermal coupling analysis of the cratered hole, Master thesis, Tianjin University of Technology, Tianjin, CHINA, 2021
  30. Aga, V., et al., Aerothermal performance of streamwise and compound angled pulsating film cooling jets, J. Turbomach, 131(2009), 4, Article number, 041015