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Effect of free-stream turbulence on heat transfer and fluid flow in a transonic turbine stage

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Author

Summary, in English

In the present work, a numerical study has been performed to simulate the effect of free-stream turbulence, length scale and variations in rotational speed of the rotor on heat transfer and fluid flow for a transonic high-pressure turbine stage with tip clearance. The stator and rotor rows interact via a mixing plane, which allows the stage to be computed in a steady manner. The focus is on turbine aerodynamics and heat transfer behavior at the mid-span location, and at the rotor tip and casing region. The results of the fully 3D CFD simulations are compared with experimental results available for the so-called MT1 turbine stage. The predicted heat transfer and static pressure distributions show reasonable agreement with the experimental data. In general, the local Nusselt number increases, at the same turbulence length scale, as the turbulence intensity increases, and the location of the suction side boundary layer transition moves upstream towards the blade leading edge. Comparison of the different length scales at the same turbulence intensity shows that the stagnation heat transfer was significantly increased as the length scale increased. However, the length scale evidenced no significant effects on blade tip or rotor casing heat transfer. Also, the results presented in this paper show that the rotational speed in addition to the turbulence intensity and length scale has an important contribution to the turbine blade aerodynamics and heat transfer. Copyright

Department/s

Publishing year

2006

Language

English

Publication/Series

American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD

Document type

Conference paper

Publisher

American Society Of Mechanical Engineers (ASME)

Topic

  • Energy Engineering

Keywords

  • Boundary layer transition
  • Free stream turbulence
  • Rotational speed

Conference name

2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006

Conference date

2006-11-05 - 2006-11-10

Conference place

Chicago, IL, United States

Status

Published

ISBN/ISSN/Other

  • ISSN: 0272-5673
  • ISBN: 0791837904