Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Heat Transfer Characteristics on the Tip Surface of a High-Turning Turbine Rotor Blade

고선회 터빈 동익 팁 표면에서의 열전달 특성

  • 이상우 (금오공과대학교 기계공학부) ;
  • 문현석 (금오공과대학교 대학원 기계공학과)
  • Published : 2008.03.01
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Abstract

The heat/mass transfer characteristics on the plane tip surface of a high-turning first-stage turbine rotor blade has been investigated by employing the naphthalene sublimation technique. At the Reynolds number of $2.09{\times}10^5$, heat/mass transfer coefficients are measured for the tip gap height-to-chord ratio, h/c, of 2.0% at turbulence levels of Tu = 0.3 and 14.7%. A tip-surface flow visualization is also performed for h/c = 2.0% at Tu = 0.3%. The results show that there exists a strong flow separation/re-attachment process, which results in severe local thermal load along the pressure-side corner, and a pair of vortices named "tip gap vortices" in this study is identified along the pressure and suction-side tip corners near the leading edge. The loci and subsequent development of the pressure- and suction-side tip gap vortices are discussed in detail. The combustor-level high inlet turbulence, which increases the tip-surface heat/mass transfer, provides more uniform thermal-load distribution.

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References

  1. Mayle, R. E. and Metzger, D. E., 1982,'Heat Transfer at the Tip of an Unshrouded Turbine Blade,' Proceedings of 7th International Heat Transfer Conference, Vol. 3, pp. 87-92
  2. Chyu, M. K., Moon, H. K. and Metzger, D. E., 1989,'Heat Transfer in the Tip Region of Grooved Turbine Blades,' ASME Journal of Turbomachinery, Vol. 111, pp. 131-138 https://doi.org/10.1115/1.3262247
  3. Metzger, D. E., Dunn, M. G. and Hah, C., 1992,'Turbine Tip and Shroud Heat Transfer,' ASME Journal of Turbomachinery, Vol. 113, pp. 502-507 https://doi.org/10.1115/1.2927902
  4. Moore, J., Moore, J. R, Henry, G. S. and Chaudhry, U., 1989,'Flow and Heat Transfer in Turbine Tip Gaps,' ASME Journal of Turbomachinery, Vol. 111, pp. 301-309 https://doi.org/10.1115/1.3262269
  5. Ameri, A. A., Steinthorsson, E. and Rigby, D. L., 1999,'Effect of Tip Clearance and Casing Recess on Heat Transfer and Stage Efficiency in Axial Turbines,' ASME Journal of Turbomachinery, Vol. 121, pp. 683-693 https://doi.org/10.1115/1.2836720
  6. Azad, Gm. S., Han, J.-C., Teng, S. and Boyle, R. J., 2000,'Heat Transfer and Pressure Distributions on a Gas Turbine Blade Tip,' ASME Journal of Turbomachinery, Vol. 122, pp. 717-724 https://doi.org/10.1115/1.1308567
  7. Azad, Gm. S., Han, J.-C. and Boyle, R. J., 2000,'Heat Transfer and Pressure Distributions on the Squealer Tip of a Gas Turbine Blade,' ASME Journal of Turbomachinery, Vol. 122, pp. 725-732 https://doi.org/10.1115/1.1311284
  8. Bunker, R. S., Bailey, J. C. and Ameri, A. A., 2000,'Heat Transfer and Flow on the First-Stage Blade Tip of a Power Generation Gas Turbine: Part 1-Experimental Results,' ASME Journal of Turbomachinery, Vol. 122, pp. 263-271 https://doi.org/10.1115/1.555443
  9. Ameri, A. A. and Bunker, R. S., 2000,'Heat Transfer and Flow on the First-Stage Blade Tip of a Power Generation Gas Turbine: Part 2-Simulation Results,' ASME Journal of Turbomachinery, Vol. 122, pp. 272-277 https://doi.org/10.1115/1.555444
  10. Ameri, A. A., 2001,'Heat Transfer and Flow on the Blade Tip of a Gas Turbine Equipped With a Mean-Camberline Strip,' ASME Journal of Turbomachinery, Vol. 123, pp. 704-708 https://doi.org/10.1115/1.1400114
  11. Kwak, J. S., Ahn, J. Han, J-C, Lee, C. P., Bunker, R. S., Boyl, R. and Gaugler, R., 2003,'Heat Transfer Coefficients on the Squealer Tip and Near-Tip Regions of a Gas Turbine Blade With Single or Double Squealer,' ASME Journal of Turbomachinery, Vol. 125, pp. 778-787 https://doi.org/10.1115/1.1626684
  12. Saxena, V., Nasir, H., and Ekkad, S. V., 2004,'Effect of Blade Tip Geometry on Tip Flow and Heat Transfer for a Blade in a Low-Speed Cascade,' ASME Journal of Turbomachinery, Vol. 126, pp. 130-138 https://doi.org/10.1115/1.1643385
  13. Nasir, H., Ekkad, S. V., Kontrovitz, D, M., Bunker, R. S. and Prakash, C., 2004,'Effect of Tip Gap and Squealer Geometry on Detailed Heat Transfer Measurements Over a High Pressure Turbine Rotor Blade Tip,' ASME Journal of Turbomachinery, Vol. 126, pp. 221-228 https://doi.org/10.1115/1.1731416
  14. Newton, P. J., Lock, G. D., Krishnababu, S. K., Hodson, H. P., Dawes, W. N., Hannis, J. and Whitney C., 2006,'Heat Transfer and Aerodynamics of Turbine Blade Tips in a Linear Cascade,' ASME Journal of Turbomachinery, Vol. 128, pp. 300-309 https://doi.org/10.1115/1.2137745
  15. Goldstein, R. J. and Cho, H. H., 1995,'A Review of Mass Transfer Measurements Using Naphthalene Sublimation,' Experimental Thermal and Fluid Science, Vol. 10, pp. 416-434 https://doi.org/10.1016/0894-1777(94)00071-F
  16. Ambrose, D., Lawrenson, I. J. and Sprake, C. H. S., 1975,'The Vapour Pressure of Naphthalene,' J. Chem. Thermodynamics, Vol. 7, pp. 1173-1176 https://doi.org/10.1016/0021-9614(75)90038-5
  17. Lee, S. W., Jun, S. B., Park, B. K. and Lee, J. S., 2004,'Effects of Combustor-Level High Inlet Turbulence on the Endwall Flow and Heat/Mass Transfer of a High-Turning Rotor Cascade,' KSME Int. J., Vol. 18, pp. 1435-1450
  18. Jun, S. B., 2000, Measurements of Endwall Heat (Mass) Transfer Coefficient in a Linear Turbine Cascade Using Naphthalene Sublimation Technique, MS thesis, Kumoh National Institute of Technology
  19. Abernethy, R. B., Benedict, R. P. and Dowdell, R. B., 1985,'ASME Measurement Uncertainty,' ASME Journal of Fluids Engineering, Vol. 107, pp. 161-164 https://doi.org/10.1115/1.3242450
  20. Kwon, H. G. and Lee, S. W., 2007,'Heat/ Mass Transfer Characteristics in the Near-Tip Region on a Turbine Blade Surface Under Combustor-Level High Inlet Turbulence,' Journal of Mechanical Science and Technology, Vol. 21, pp. 486-494 https://doi.org/10.1007/BF02916310

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