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Parameters affecting turbulent film cooling reynolds-averaged navier-stokes computational simulation

Mahjoob, S ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.2514/1.14616
  3. Publisher: American Institute of Aeronautics and Astronautics Inc , 2006
  4. Abstract:
  5. Film cooling of surfaces appears in many applications. For instance, it is one of the most effective methods to improve the efficiency of gas turbines. As a fundamental study, two different types of film cooling (slot and discrete holes injections) are numerically simulated here. A flat surface is used to model a small portion of a gas turbine blade. Incompressible, stationary, viscous, turbulent flow is assumed using the STAR-CD software with the standard k-ε model and a cell-centered finite volume method on a nonuniform structured grid. The jet flow Reynolds number, based on the jet's hydraulic diameter, is 4.7 × 103. The study of the injection angle and the velocity ratio shows that the optimum film cooling occurs at jet angle of about 30 deg. However, the optimal velocity ratios of about 1.5 for slot injection and about 0.5 for discrete holes injection have been obtained. On the other hand, the study of jet-exit aspect ratio in discrete holes injection shows that stretching the hole in spanwise direction increases the film-cooling effectiveness. Also, the study of jet spacing in spanwise direction shows that decreasing the jet spacing increases the film-cooling effectiveness, but not as much as the jet aspect ratio. Copyright © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved
  6. Keywords:
  7. Film cooling ; Injection angle ; Jet flow Reynolds number ; Slot injection ; Cooling ; Computer simulation ; Finite volume method ; Gas turbines ; Hydraulics ; Jets ; Reynolds number ; Thin films ; Turbulent flow ; Viscous flow
  8. Source: Journal of Thermophysics and Heat Transfer ; Volume 20, Issue 1 , 2006 , Pages 92-100 ; 08878722 (ISSN)
  9. URL: https://arc.aiaa.org/doi/10.2514/1.14616