1. 1 Using PROPID for Inverse Design Michael S. Selig Associate Professor Steady-State Aerodynamics Codes for HAWTs Selig, Tangler, and Giguère August 2, 1999  NREL NWTC, Golden, CO Department of Aeronautical and Astronautical Engineering University of Illinois at Urbana-Champaign

2. 2 Peak Power Specification for a Stall Regulated Turbine (1-D Iteration) PROPID Run: wt04a.in –Baseline Power Curve, No Iteration

3. 3 –Iterate on Scale factor (% Growth) –NEWT1ISWP Line

4. 4 –Variables for Iteration (ITP* Parameters)

5. 5 –Running Interactively with Newton Iteration

6. 6 –NEWT1ISWP Line - Variations

7. 7 –The Quickest Approach

8. 8 –Final Converged Power and Baseline –Radius Grew from 24.6 ft  25.5 ft (see ftn021.dat) New rotor

9. 9 PROPID Run: wt05a.in –Iteration on Blade Pitch Instead –NEWT1ISWP Line

10. 10 –Variables for Iteration (ITP* Parameters)

11. 11 –Final Converged Power Curve and Previous Ones –Pitch Change: 2 deg  4.3 deg wt04a.in & wt05a.in Example of 1-D Newton Iteration New rotor

12. 12 2-D Newton Iteration PROPID Run: wt06a.in –Rotor Scale  Peak Power (500 kW) –Rotor RPM  Tip Speed (150 mph, 220 ft/sec)

13. 13 –Screen Grab from Run - Stages

14. 14 –Resulting Power Curve –Radius Change: 24.61 ft  39.9 ft –RPM Change: 64 rpm  52.6 rpm AEP = 694 MWh/yr 500 kW Peak Power

15. 15 Lift and Axial Inflow Specifications (Multidimensional Newton Iteration) PROPID Run: wt07a.in (analysis only) –Rotor Radius Same as wt06a.in (39.9 ft) –Variable Speed Turbine Design, TSR = 6

16. 16 –DP and Special Input Lines

17. 17 –Cp (2D_SWEEP) & Power Curve (2D_SWEEP)

18. 18 –Blade Aero and Geometry (1D_SWEEP)

19. 19 –Power Curves –AEP 790 MWh/yr (wt07a) vs 694 MWh/yr (wt06a) Stall Regulated Baseline Variable Speed Case

20. 20 –Lift Distribution –Desire Cl-dist for Best L/D-dist

21. 21 –Axial Induction Factor Distribution –Desire a = 1/3 Betz Optimum

22. 22 PROPID Run: wt08a.in –Desired Cl-dist vs Baseline

23. 23 –Tabulated Cl-dist

24. 24 –Stage 1: Cl @ Segment 8 = 1.00 –Iterate Pitch –NEWT1LDP Cl Segment 8

25. 25 –Stage 2: Cl @ Segments 9-10 Relative to 8 –Iterate Twist @ Segments 9-10 –NEWT2SDDP

26. 26 –Details Cl Increment @ Segment 9 Relative to Segment 8

27. 27 Relative Cl Values Segment # 8910 -.05 -.10 Values Relative to Segment 8

28. 28 –Iteration Schedule for Cl

29. 29 –Stage 3: Cl @ Segments 2-7 Relative to 8 –Iterate Twist @ Segments 2-7

30. 30 –Converged Cl Distribution

31. 31 –Stage 4: Axial Inflow @ Segment 8 =.333 –Iterate Chord @ Segment 8

32. 32 Iteration for Axial Inflow at Segment 8

33. 33 –Stage 5: Axial Inflow @ Segments 9-10 Relative to 8 –Iterate Chord @ Segments 9-10

34. 34 –Iteration Schedule for Axial Induction Factor

35. 35 –Stage 6: Axial Inflow @ Segments 2-7 Relative to 8 –Iterate Chord @ Segments 2-7

36. 36 –Converged Axial Inflow Distribution

37. 37 –Automatic Convergence: Uncomment these lines

38. 38 –Power Curve Comparison –AEP 803 MWh/yr (wt08a) vs 790 MWh/yr (wt07a)

39. 39 Debugging an Input File Screen Dump on Crash –Now What?

40. 40 –Turn on Debugging Feature (ECHO_INPUT Line) Bad NEWT1LDP Line

41. 41 Errors, Warnings, and Notes at Runtime –Not Again! *&)*^)^(^:)????

42. 42 –Refer to warnerr-doc.txt Problem Not Solved? –Email Philippe Giguère! He has offered free tech support during all of August 1999.