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Large Eddy Simulations of Rectangular Jets in Crossflow: Effect of Hole Aspect Ratio

  • Mayank Tyagi
  • Sumanta Acharya
Part of the Fluid Mechanics and its Applications book series (FMIA, volume 54)

Abstract

Large eddy simulations of rectangular jets in crossflow are performed to study the effect of hole geometry on the penetration and spread of the coolant jet. Three different holes of aspect ratio 0.5, 1.0 and 2.0 are studied. In the present study, the jet to crossflow blowing ratio is 0.5 and the jet Reynolds number is approximately 4,700.

It is observed that the dynamics of jets in crossflow are influenced significantly by the hole geometry for low jet to mainstream velocity ratios near the hole exit. The vertical penetration is greatest for the aspect ratio 2.0 and least for the aspect ratio 0.5. Dynamics of various steady as well as unsteady flow structures for different holes is markedly distinct at this Reynolds number. The separation between the leading and trailing edges of holes controls the evolution of the counter rotating vortex pair (CVP) near the jet exit. The relative strength of horseshoe vortex as compared to CVP changes with the hole geometry.

Keywords

Wall Shear Stress Large Eddy Simulation Reynolds Stress Cross Flow Film Cool 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Mayank Tyagi
    • 1
  • Sumanta Acharya
    • 1
  1. 1.Mechanical Engineering DepartmentLouisiana State UniversityBaton RougeUSA

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