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WIND TUNNEL SIMULATION OF WAKE EFFECTS ON WIND TURBINE PERFORMANCE

WIND TUNNEL SIMULATION OF WAKE EFFECTS ON WIND TURBINE PERFORMANCE. M. S. Adaramola and P-Å Krogstad Department of Energy and Process Engineering, The Norwegian University of Science and Technology, N-7491 Trondheim, Norway. OUTLINES. Introduction Objectives Experimental set-up Results

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WIND TUNNEL SIMULATION OF WAKE EFFECTS ON WIND TURBINE PERFORMANCE

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  1. WIND TUNNEL SIMULATION OF WAKE EFFECTS ON WIND TURBINE PERFORMANCE M. S. Adaramola and P-Å Krogstad Department of Energy and Process Engineering, The Norwegian University of Science and Technology, N-7491 Trondheim, Norway

  2. OUTLINES Introduction Objectives Experimental set-up Results Conclusions

  3. Turbine wake

  4. Wind conditions Turbine wake

  5. Performance characteristics Wind conditions Turbine wake

  6. Performance characteristics Wind conditions Turbine wake Site topology/ surface roughness

  7. Performance characteristics Wind conditions Turbine wake Site topology/ surface roughness Downstream turbine performance depends on these parameters as well as distance from the upstream turbine.

  8. OBJECTIVES

  9. Effect of distance of separation between the turbines, S/D.

  10. Effect of distance of separation between the turbines, S/D. • Effect of power extracted from the upstream • turbine, i.e. function of tip speed ratio, 

  11. Effect of distance of separation between the turbines, S/D. • Effect of power extracted from the upstream • turbine, i.e. function of tip speed ratio,  • 3.Effect of downstream turbine pitch angle, β.

  12. EXPERIMENTAL SET-UP

  13. Wind tunnel Dimensions: • Height – 1.9 m • Width – 2.7 m • Length – 12 m • Blockage ratio:12.4% • Wind velocity:11.5 m/s

  14. Gap between turbines: • S/D = 3, 6, 9 • Downstream turbine: • β = -2o, 0o, 2o • Upstream turbine operating conditions: • Optimum  • Low, optimum and high 

  15. Model turbine layout

  16. RESULTS

  17. Effect of S/Don CP curve for downstream turbine

  18. Relative max. Cp when downstream turbine blade pitch setting is β = 2o

  19. Effect of downstream turbine blade pitch setting (β ) for S/D = 3

  20. Cp as function of upstream turbine 

  21. Relative max. Cp as function of upstream turbine  Downstream turbine at S/D = 3

  22. CONCLUSIONS

  23. 1. The turbines should be operated at different blade pitch angles.

  24. 1. The turbines should be operated at different blade pitch angles. 2. Operating the upstream turbine slightly outside its optimum  will increase the performance of the turbines further downstream.

  25. 1. The turbines should be operated at different blade pitch angles. 2. Operating the upstream turbine slightly outside its optimum  will increase the performance of the turbines further downstream. 3. Increase in the downstream turbine power production may improve the overall wind farm performance.

  26. THANK YOU

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