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

  • 제30권5호
  • /
  • Pages.446-456
  • /
  • 2006
  • /
  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지
DOI QR코드

DOI QR Code

고정된 터빈 블레이드의 베인에 대한 상대위치 변화가 끝단면 및 슈라우드의 열/물질전달 특성에 미치는 영향

Effect of Vane/Blade Relative Position on Heat/Mass Transfer Characteristics on the Tip and Shroud for Stationary Turbine Blade

  • 발행 : 2006.05.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The effect of relative position of the stationary turbine blade for the fixed vane has been investigated on blade tip and shroud heat transfer. The local mass transfer coefficients were measured on the tip and shroud fur the blade fixed at six different positions within a pitch. A low speed stationary annular cascade with a single turbine stage was used. The chord length of the tested blade is 150 mm and the mean tip clearance of the blade having flat tip is 2.5% of the blade chord. A naphthalene sublimation technique was used for the detailed mass transfer measurements on the tip and the shroud. The inlet flow Reynolds number based on chord length and incoming flow velocity is fixed to $1.5{\times}10^5$. The results show that the incoming flow condition and heat transfer characteristics significantly change when the relative position of the blade changes. On the tip, the size of high heat/mass transfer region along the pressure side varies in the axial direction and the difference of heat transfer coefficient is up to 40% in the upstream region of the tip because the position of flow reattachment changes. On shroud, the effect of tip leakage vortex on the shroud as well as tip gap entering flow changes as the blade position changes. Thus, significantly different heat transfer patterns are observed with various blade positions and the periodic variation of heat transfer is expected with the blade rotation.

키워드

참고문헌

  1. Metzger, D. E., Dunn, M. G and Hah, C., 1991, 'Turbine Tip and Shroud Heat Transfer,' ASME J. of Turbomachinery, Vol. 113, pp. 502-507 https://doi.org/10.1115/1.2927902
  2. 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 J. of Turbomachinery, Vol. 122, pp. 263-271 https://doi.org/10.1115/1.555443
  3. Azad, Gm S., Han, Je-Chin, Teng, S. and Boyle, R. J., 2000, 'Heat Transfer and Pressure Distributions on a Gas Turbine Blade Tip,' ASME J. of Turbomachinery, Vol. 122, pp. 717-724 https://doi.org/10.1115/1.1308567
  4. Azad, Gm S., Han, Je-Chin and Boyle, R. J., 2000, 'Heat Transfer and Flow on the Squealer Tip of a Gas Turbine Blade,' ASME J. of Turbomachinery, Vol. 122, pp. 725-732 https://doi.org/10.1115/1.1311284
  5. Saxena, V., Nasir, H. and Ekkad, S. V., 2003, 'Effect of Blade Tip Geometry on Tip Flow and Heat Transfer for a Blade in a Low Speed Cascade,' ASME J. of Turbomachinery, Vol. 126, pp. 130-138 https://doi.org/10.1115/1.1643385
  6. Jin, P. and Goldstein, R. J., 2002, 'Local Mass/Heat Transfer on a Turbine Blade Tip,' 9th of ISROMAC, Paper No. HT-ABS-012
  7. Kwak, J. S. and Han, J. c., 2003, 'Heat Transfer Coefficients on the Squealer Tip and Near Squealer Tip Regions of a Gas Turbine Blade,' ASME J of Heat Transfer, Vol. 125, pp. 669-677 https://doi.org/10.1115/1.1571849
  8. Cho, H. H., Rhee, D. H. and Choi, J. H., 2001, 'Heat/Mass Transfer Characteristics on Turbine Shroud with Blade Tip Clearance,' Annals of The New York Academy of Sciences, Heat Transfer in Gas Turbine Systems, Vol. 934, pp. 281-288 https://doi.org/10.1111/j.1749-6632.2001.tb05861.x
  9. Rhee, D. H. and Cho, H. H., 2005, 'Heat/Mass Transfer Characteristics on Stationary Turbine Blade and Shroud in a Low Speed Annular Cascade (II)-Tip and Shroud,' Trans. Of the KSME B, Vol. 29, No.4, pp. 495-503
  10. Goldstein, R. J. and Cho, H. H., 1995, 'A Review of Mass Transfer Measurement Using Naphthalene Sublimation,' Experimental Thermal and Fluid Science, Vol. 10, pp. 416-434 https://doi.org/10.1016/0894-1777(94)00071-F
  11. Rhee, D. H. and Cho, H. H., 2005, 'HeatlMass Transfer Characteristics on Stationary Turbine Blade and Shroud in a Low Speed Annular Cascade (I) Near-tip Surface,' Trans. Of the KSME B, Vol. 29, No.4 pp. 485-494
  12. Kline, S. J. and McClinetock, E, 1953, 'Describing Uncertainty in Single Sample Experiments,' Mechanical Engineering, Vol. 75, pp. 3-8
  13. Rhee, D. H., 2004, 'Local HeatlMass Transfer Characteristics on Turbine Rotor and Shroud in a Low Speed Annular Cascade,' Ph. D. Thesis, Yansei University