THERMAL SCIENCE

International Scientific Journal

EFFECT OF SPHERICAL BLOCKAGE CONFIGURATIONS ON FILM COOLING

ABSTRACT
With increasing inlet temperature of gas turbines, turbine blades need to be effectively protected by using cooling technologies. However, the deposition from the fuel impurities and dust particles in the air is often found inside film holes, which results in partial hole blockage. In this paper, the deposition geometry is simplified as a rectangular channel, and the effect of three blockage ratios is investigated by using the computational fluid dynamics. In addition, water droplets are also released from the coolant inlet to provide a comparison of the results with and without mist injection. It is found that the lateral film cooling effectiveness is reduced with increasing blockage ratio. For all the cases with the blowing ratio 0.6, 1% mist injection provides an improvement of the cooling performance by approximately 10%.
KEYWORDS
PAPER SUBMITTED: 2017-12-29
PAPER REVISED: 2018-02-27
PAPER ACCEPTED: 2018-02-28
PUBLISHED ONLINE: 2018-09-23
DOI REFERENCE: https://doi.org/10.2298/TSCI171229257W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE 5, PAGES [1933 - 1942]
REFERENCES
  1. Kumar, M., et al., Conjugated Heat Transfer Analysis of Gas Turbine Vanes Using MacCormackʼs Technique, Thermal Science, 12 (2008), 3, pp. 65-73
  2. Liu, X., Zheng, H., Influence of Deflection Hole Angle on Effusion Cooling in a Real Combustion Chamber Condition, Thermal Science, 19 (2015), 2, pp. 645-656
  3. Xie, Y. H., et al., Numerical Study on Film Cooling and Convective Heat Transfer Characteristics in the Cutback Region of Turbine Blade Trailing Edge, Thermal Science, 20 (2016), Suppl. 3, pp. 643-649
  4. Koc, I., et al., Numerical Investigation of Film Cooling Effectiveness on the Curved Surface, Energy Conversion and Management, 47 (2006), 9, pp. 1231-1246
  5. Asghar, F. H., Hyder, M. J., Computational Study of Film Cooling From Single and Two Staggered Rows of Novel Semi-Circular Cooling Holes Including Coolant Plenum, Energy Conversion and Management, 52 (2011), 1, pp. 329-334
  6. Bayraktar, S., Yılmaz, T., Three-dimensional Analysis of Temperature Field for Various Parameters Affect the Film Cooling Effectiveness, Energy Conversion and Management, 52 (2011), 4, pp. 1914-1929
  7. Shine, S. R., et al., Internal Wall-jet Film Cooling with Compound Angle Cylindrical Holes, Energy Conversion and Management, 68 (2013), 3, pp. 54-62
  8. Du, K., Li, J., Numerical Study on the Effects of Slot Injection Configuration and Endwall Alignment Mode on the Film Cooling Performance of Vane Endwall, International Journal of Heat and Mass Transfer, 98 (2016), July, pp. 768-777
  9. Sheng, L., Hao, Y. L., Particle Deposition Characteristics in Entrained Flow Coal Gasifier, Thermal Science, 16 (2012), 5, pp. 1544-1548
  10. Chung, H. Y., et al., Trailing Edge Cooling of a Gas Turbine Blade with Perforated Blockages with Inclined Holes, International Journal of Heat and Mass Transfer, 73 (2014), 3, pp. 9-20
  11. Davidson, F. T., et al., A Study of Deposition on a Turbine Vane with a Thermal Barrier Coating and Various Film Cooling Geometries, ASME Journal of Turbomachinery, 136 (2013), 4, pp. 1769-1780
  12. Kistenmacher, D. A., et al., Realistic Trench Film Cooling with a Thermal Barrier Coating and Deposition, ASME Journal of Turbomachinery, 136 (2014), 9, pp. 091002
  13. Li, X. C., Wang, T., Simulation of Film Cooling Enhancement with Mist Injection, ASME Journal of Heat Transfer, 128 (2006), 6, pp. 509-519
  14. Wang, J., et al., Effects of Deposition Locations on Film Cooling with and without a Mist Injection, Numerical Heat Transfer Part A- Applications, 70 (2016), 10, pp. 1072-1086
  15. Wang, J., et al., Effects of Surface Deposition and Droplet Injection on Film Cooling, Energy Conversion and Management, 125 (2016), Oct., pp. 51-58
  16. Wang, J., et al., Effects of Deposition Height and Width on Film Cooling, Numerical Heat Transfer Part A- Applications, 70 (2016), 6, pp. 673-687
  17. Pan, C. X., et al., Numerical Investigation of Partial Blockage Effect on Film Cooling Effectiveness, Mathematical Problems in Engineering, 2014 (2014), Article ID 167193, p. 13
  18. Yang, C. F., Zhang, J. Z., Experimental Investigation on Film Cooling Characteristics from a Row of Holes with Ridge-shaped Tabs, Experimental Thermal and Fluid Science, 37 (2012), 3, pp. 113-120
  19. Huang, K. N., et al., Effect of Partial Blockage Inside Film Hole on Film Cooling Characteristics, Journal of Aerospace Power, 29 (2014), 6, pp. 1330-1338
  20. Wilcox, D. C., Turbulence Modeling for CFD, DCW Industries Inc., La Canada, California, United States of America, 2006
  21. Versteeg, H. K., Malalasekera, W., An Introduction to Computational Fluid Dynamics ‒ The Finite Volume Method, Longman, London, United Kingdom, 2007

© 2018 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence