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Numerical Simulation of Incompressible Film Cooling, Using Compound Triple Jets and Large Eddy Simulation Approach

Farhadi Azar, Roozbeh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39375 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Taeibi-Rahni, Mohammad; Ramezanizadeh, Mahdi
  7. Abstract:
  8. The interactions between jets and cross flows appear in many engineering applications (such as film cooling) and thus their study is of great importance. In film cooling, the coolant fluid is transferred from the compressor to the surface of the turbine blades via small holes. An increase of about 170⁰C of the engine working temperature increases the engine efficiency about 5%. To reach higher temperatures of the inlet air flow, one tries to have the least amount of interactions between the film cooling jets and the the cross flow. In this work, we computationally studied turbulent film cooling of a flat plate, in which we used the combined triple jet and investigated the effects of density differences between the jets and the cross-flow and also film cooling effectiveness. The blade was modeled as smooth plate and the large eddy simulation (LES) approach was used. The velocity ratios of different jets were investigated. Also, we studied the capability of three different sub-grid scale models, namely smagorinsky, SFM, and Yashizava one equation. Our results show that using higher density ratios for smaller jets increases the film cooling effectiveness. When the velocity ratio of the smaller jets were increased, the counter rotating vortex pair (CRVP) of these jets is produced in higher distances from the wall making the main jet lie on the surface more. This causes the film cooling effectiveness to increase
  9. Keywords:
  10. Gas Turbines ; Jet into Cross Flow Interaction ; Large Eddy Simulation (LES) ; Triple Jets

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