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Air filmcooling through laser drilled nozzles

Air filmcooling through laser drilled nozzles. STW project. CASA-dag 09.05.2006. Outline of the presentation. Introduction Current situation Local Uniform Grid Refinement Boundary conditions Conclusions and future plans. Introduction. Introduction. Introduction. Introduction.

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Air filmcooling through laser drilled nozzles

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  1. Air filmcooling through laser drilled nozzles STW project CASA-dag 09.05.2006

  2. Outline of the presentation • Introduction • Current situation • Local Uniform Grid Refinement • Boundary conditions • Conclusions and future plans

  3. Introduction

  4. Introduction

  5. Introduction

  6. Introduction • Film cooling holes can be drilled by • electro-discharged drilling • laser drilling

  7. Laser drilling is a fast but crude process Cooling effectivity depends on detailed flow-’structure’

  8. Problem of interest

  9. The water channel with the glass test section (2.00 x 0.57 x 0.45 m) The interaction of the cross flow and the inclined jet over the flat plate Apparatus and Measurements Techniques Water channel at the TU/e Measurements technique • Particle Image Velocimetry – PIV • Laser Induced Fluorescence - LIFVisualization • Liquide Crystal Thermography - LCT

  10. U= 0.20m/s Ujet is adjusable α = 350 The water channel and the set-up for the inclined jet

  11. Coherent Structures in a Jet Crossflow Interaction

  12. Vertical laser sheet

  13. Averaged velocity in the inner-torus caseVR=0.45

  14. Current situation • Compressible Navier-Stokes DNS code • Parallel Fortran code for Silicon Graphics and Beowulf Cluster

  15. Answer (simple) Buy bigger computer Answer (smart) Local grid refinement Problem Need more resolution in high activity area

  16. Smart answer - two grid LUGR algorithm

  17. LUGR algorithm Boundary conditions Global coarse Grid Local fine Grid Substitution

  18. Boundary conditions for the fine grid • Dirichlet BC from the coarse grid • Using “physical” variables (velocity, pressure, etc.) • Using “acoustical” quantities (directions and amplitudes of the incoming and outgoing waves)

  19. Results of calculation

  20. Results of calculation Equivalent uniform fine grid Composite grid

  21. Computation time

  22. Results of computation

  23. Simple: Parabolic linear Boundary conditions – jet profile Real: ?

  24. Boundary conditions – jet profile DNS code Boundary conditions at walls Velocity and temperature profile at nozzle’s exit Unstructured solver

  25. Imperfections

  26. Imperfections

  27. Horizontal (x) velocity

  28. Vertical (y) velocity

  29. Some results

  30. Summary • All three velocity components are present • Profiles differ from parabolic, specially for inaccuracies close to the exit • Qualitative agreement between experimental and numerical results

  31. Boundary conditions – some conclusions • Size – “blockage” • Position – better have inaccuracies away from the exit • Shape – “small” influence

  32. Conclusions • Local grid refinement. • First results for inflow profiles. • Different imperfections • Influence of size, shape, position

  33. Future plans (next 1.5 months) • Back substitution of inflow profiles. • Comparison of the heat fluxes with experiments.

  34. Questions?

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