Abstract
A new type of film cooling hole with micro groove structure is presented in this paper. Based on the finite volume method and the Realizable k-ε model, the film cooling process of the hole in a flat plate structure is simulated. The surface temperature distribution and film cooling effect of different film cooling holes were analyzed. The effects of micro-groove structure on wall attachment and cooling efficiency of jet were discussed. The results show that under the same conditions, the transverse coverage width and overall protective area of the new micro-groove holes are larger than those of the ordinary cylindrical holes and special-shaped holes. Compared with ordinary holes, the new micro-groove holes can better form the film covering on the surface and enhance the overall film cooling efficiency of the wall. For example, when the blowing ratio M=1.5, the effective coverage ratio of micro-groove holes is 1.5 times the dustpan holes and is 8 times the traditional cylindrical holes. It provides reference data and experience rules for the optimization and selection of advanced cooling structure of high performance aero-gas engine hot-end components.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
Abbreviations
- A f :
-
effective film coverage ratio
- a f :
-
effective gas film coverage area/m2
- a h :
-
cross section area of channel/m2
- C p :
-
heat capacity at constant pressure/J·kg−1·K−1
- D :
-
inlet diameter of the jet hole/m
- H d :
-
height of main channel/m
- I :
-
unit tensor
- k :
-
heat conduction coefficient/W·m−1·K−1
- L :
-
length of jet channel/m
- L 1 :
-
length of the cylindrical part of jet channel/m
- L d :
-
length of main channel/m
- M :
-
blowing ratio M = ρcUc/ρ∞U∞
- P c :
-
pressure of jet flow/Pa
- P ∞ :
-
pressure of mainstream/Pa
- p :
-
pressure/Pa
- S t :
-
viscous dissipation term
- T :
-
temperature/K
- T aw :
-
temperature of adiabatic wall/K
- T c :
-
temperature of jet flow/K
- T ∞ :
-
temperature of mainstream/K
- t :
-
time/s
- U c :
-
velocity of jet flow/m·s−1
- U ∞ :
-
velocity of mainstream/m·s−1
- V :
-
velocity vector field/m·s−1
- \(\vec v\) :
-
velocity vectors in the x, y, z/m·s−1
- W d :
-
width of main channel/m
- W 1 :
-
width of part of micro-groove/m
- α :
-
injection angle/°
- δ :
-
lateral expansion angle/°
- η :
-
film-cooling effectiveness
- θ :
-
streamwise expansion angle/°
- μ :
-
viscosity coefficient/N-s-m−2
- ρ :
-
density/kg·m−3
- ρ c :
-
density of jet flow/kg·m−3
- ρ ∞ :
-
density of mainstream/kg·m−3
References
Goldstein R.J., Film cooling, advances in heat transfer. Academic Press, Salt Lake City, UT, USA, 1971, 7: 321–379.
Goldstein R.J., Eckert E.R.G., Burggraf F., Effects of hole-geometry and density on three-dimensional film cooling. International Journal of Heat & Mass Transfer, 1974, 17: 595–607.
Kruse H., Effects of hole geometry, wall curvature and pressure gradient on film cooling downstream of a single row. In AGARD Heat Transfer and Cooling in Gas Turbines 13 p (SEE N86-29823 21-07), 1985.
Haven B.A., Yamagata D.K., Kurosaka M., Yamawaki S., Maya T., Anti kidney pair of vortices in shaped holes and their influence on film cooling effectiveness. Proceedings of the ASME Turbo Expo 1997, Paper 97-GT-45.
Bunker R.S., A review of turbine shaped film cooling technology. Journal of Heat Transfer, 2005, 127: 441–453.
Lu Y., Dhungel A., Ekkad S.V., Bunker R.S., Effect of trench width and depth on film cooling from cylindrical holes embedded in trenches. ASME Journal Turbomach, 2009, 131: 011003.
Lee K.D., Kim K.Y., Optimization of a cylindrical film cooling hole using surrogate modeling. Numerical Heat Transfer Part A, 2009, 55 (4): 362–380.
Kim J.H., Kim K.Y., Film-cooling performance of converged-inlet hole shapes. International Journal of Thermal Science, 2018, 124: 196–211.
Davidson F.T., KistenMacher D.A., Bogard D.G., Film cooling with a thermal barrier coating: round holes craters, and trenches. ASME Journal Turbomachinery, 2014, 136: 041007.
Zhang Z.J., Zhu X., Huang Y., Wang C.H., Investigation on film cooling performance from a row of round-to-slot holes on flat plate. International Journal of Thermal Science, 2017, 118: 207–225.
Zhang B.L., Zhu H.R, Liu C.L, Yao C.Y., Fu Z.Y., Experimental and numerical research on heat transfer and flow characteristics in two-turn ribbed serpentine channel with lateral outflow. Experimental Thermal and Fluid Science, 2019, 104: 116–128.
Karsten K., Anas E., Dieter B., Takao S., Ryozo T., Masahide K., The nekomimi cooling technology: cooling holes with ears for high-efficient film cooling. Proceedings of ASME Turbo Expo 2011, Vancouver, Canada, Paper GT2011-45524.
Marc J.E., Jubran B.A., A numerical study on improving large angle film cooling performance through the use of sister holes. Numerical Heat Transfer, Part A, 2009, 55: 634–653.
Liu Z., Yang X., Feng Z.P., Study on heat transfer and cooling in gas turbine blade: Film cooling. Thermal Turbine, 2014, 43: 1–9.
Li S.H., Song D.H., Liu J.H., et al., Numerical simulations of flat plate film cooling using respectively different shaped jet holes. Proceedings of the Chinese Society for Electrical Engineering, 2006, 26: 112–116.
Zhang D.H., Ren B., Liu S., Discuss on evaluation of film cooling uniformity. Turbine Technology, 2013, 55: 171–174.
Zhou J.F., Wang X.J., Li J., Li Y.D., Effects of film cooling hole locations on flow and heat transfer characteristics of impingement/effusion cooling at turbine blade leading edge. International Journal of Heat & Mass Transfer, 2018, 126: 192–205.
Zhu X.D., Zhang J.Z., Tan X.M., Numerical assessment of round-to-slot film cooling performances on a turbine blade under engine representative conditions. International Communications in Heat and Mass Transfer, 2019, 100: 98–110.
Ye L., Liu C.L., Liu H.Y., Zhu H.R., Lu J.X., Experimental and numerical study on the effects of rib orientation angle on film cooling performance of compound angle holes. International Journal of Heat & Mass Transfer, 2018, 126: 1099–1112.
Tang X.Z., Li L.P., Huang Z.J., et al., Influence of hole spacing on the film cooling effectiveness of a gas turbine moving blade. Journal of Chinese Society of Power Engineering, 2018, 38: 105–113.
Lubman D M. Lasers and mass spectrometry. Oxford: Oxford University Press, 1990.
Acknowledgement
This work was supported by Key Deployment Projects of the Chinese Academy of Sciences (ZDRW-CN-2019-01), National Defense Basic Scientific Research Program (JCKY2016130B203), National Natural Science Foundation of China (U1609208).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Guo, C., Wang, B., Kang, Z. et al. Numerical Simulation Study on Cooling Characteristics of a New Type of Film Hole. J. Therm. Sci. 30, 210–219 (2021). https://doi.org/10.1007/s11630-020-1288-0
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11630-020-1288-0