DOI QR코드

DOI QR Code

주기적인 통과후류가 막냉각되는 평판의 유동장에 미치는 영향(1);압력면과 흡입면에 대한 영향(1)

Effect of Periodic Passing Wake on the Flow Field of a Film-Cooled Flat Plate(I)

  • 국건 (서울대학교 대학원 기계공학과) ;
  • 이준식 (서울대학교 기계공학과) ;
  • 고상근 (서울대학교 기계공학과)
  • Kuk, Keon (Dept.of Mechanical Engineering, Graduate School of Seoul National University) ;
  • Lee, Joon-Sik (Dept.of Mechanical Engineering, Seoul National University) ;
  • Kauh, Sang-Ken (Dept.of Mechanical Engineering, Seoul National University)
  • 발행 : 1996.06.01

초록

The effect of periodic passing wake on the film-coolant flow issuing normally from a flat plate was investigated experimentally. The passing wake was generated by rotating thin circular bars. Depending on the rotational direction the test plate could be simulated as a pressure surface or a suction surface of a gas turbine blade. The phase-averaged velocity components were measured using an X-type hot-wire probe. The Reynolds number based on the free-stream velocity and injection hole diameter was 23, 500 and the velocity ratio which is the ratio of film coolant velocity to free-stream velocity was 0.5. The velocity-triangle induced by the wake was similar to that induced by the one generated at the blade trailing edge. The vertical velocity component induced by the passing wake, which approaches to the suction surface and moves away from the pressure surface, played a dominant role in the variation of the flow field. The variation in the phase-averaged velocity on the pressure surface was greater than on the suction surface, but the turbulence kinetic energy variation on the suction surface appeared larger than on the pressure surface.

키워드

참고문헌

  1. Journal of Engineering for Power v.104 Turbine Rotor-Stator Interaction Dring R. P;Joslyn H. D;Hardin L. W;Wagner J. H
  2. AIAA Journal of Propulsion and Power v.1 Simulation of Wake-Passing in a Stationary Turbine Rotor Cascade Doorly J. J;Oldfield M. L. G
  3. AIAA Journal v.28 Air-foil Boundary-Layer Response to an Unsteady Turbulent Flowfield Renoud R. W;Howard R. M
  4. ASME GT paper Studies on Wake-Affected Heat Transfer Around the Circular Leading Edge of Blunt Body Funazaki K
  5. ASME GT paper Development of Periodic Unsteady Turbulent Wakes in a Curved Channel at Zero Streamwise Pressure Grandient Schobeiri M T;John J
  6. Journal of Engineering for Power v.102 An Experimental Investigation of Film Cooling on a Turbine Rotor Blade Dring R. P;Blair M. F;Joslyn H. D
  7. Journal of Turbomachinery v.114 Film Cooling on a Gas Turbine Rotor Blade Takeishi K;Aoki S;Sato T;Tsukagoshi K
  8. ASME GT paper Unsteady Wake over a Linear Trubine Blade Cascate with Air and CO2 Film Injection : Part Ⅱ: Effect on Film Effectiveness and Heat Transfer Distributions Mehendale A. B;Han J. C;Ou S.;Lee C. P.
  9. Fundamentals of Temperature and Flow Measurements 3rd Ed. Benedict R. P
  10. Jornal of Turbomachinery v.116 An Experimental Study of Film Cooling in a Rotating Transonic Turbine Abhari R. S;Epstein A. H
  11. Journal of Turbomachinery v.111 Two-Component Phase-Averaged Turbulence Statistics Downstream of a Rotating Spoked-Wheel Wake Generator O'Brien J. E;Capp, S. S
  12. Journal of Fluid Mechanics v.136 An Experimental Study of Entrainment and Transport in the Turbulent near Wake of a Circular Cylinder Cantwell, B;Coles D.
  13. AIAA Journal v.21 no.5 Application of a Three-sensor Hot-wire Probe for Incompressible Flow Butler, T. L.;Wagner, J. W
  14. Jornal of Engineering for Power An Investigation into Unsteady Blade Forces in Turbomachines Lefcourt, M. D.
  15. Journal of Fluid Mechanics v.138 Experimental Investigation of Jets in a Crossflow Andreopoulos, J;Rodi, W.