Hi everyone,
I am trying to build a model in WISDEM of a turbine with fixed pitch and variable speed with stall power control. I have started with the ‘03_blade’ example and made the following changes:
Geometry file:
max_pitch: 0
Modeling:
fix_pitch_regI12: true
max_pitch_perf_surfaces: 0.0
min_pitch_perf_surfaces: 0.0
n_U_perf_surfaces: 20
n_pitch_perf_surfaces: 1
I loaded the files into the GUI and ran the ‘no_opt’ and ‘aero’ analyses. However when I use the compare_designs script (loading the .pkl files) the plots still show that pitch regulation is active. This is also clear from the ‘rotorse.rp.powercurve.pitch’ entry in the ‘blade_out.xlsx’ file, which also shows that the pitch does not remain at 0.0 in Region 3.
Could you advise on how you would approach this problem, and where I may be going wrong? My goal is eventually to run an aero-structural blade design optimization for this turbine. Thank you.
Best Regards,
Drew
–
Drew Gertz
Northwind Engineering OÜ
+372 5565 0147
drew@northwindengineering.com
northwindengineering.com
Hello Drew,
WISDEM does not implement a stall-control logic. You’ll need to work on the source code to achieve that.
This said, it should not be a major effort.
You’ll need to work within the explicit component ComputePowerCurve github.com/WISDEM/WISDEM/blob/5 … er.py#L138
and you’ll need to bypass the steps where the pitch is controlled, such as here
github.com/WISDEM/WISDEM/blob/5 … er.py#L490
and here
github.com/WISDEM/WISDEM/blob/5 … er.py#L560
I hope this helps.
Best regards,
Pietro Bortolotti
Hi Pietro,
Thank you for your quick reply. I have now modified the code to use the modeling options max_pitch_perf_surfaces and min_pitch_perf_surfaces as the bounds in the pitch search functions. I also added a clause in Region 3 that checks max_pitch_perf_surfaces. If it is >0 then as usual it solves for the Region 3 pitch. Otherwise it solves for the Region 3 rotor speed. I ran example 03_blade (no opt) for both cases and you can see the results below. It should be sufficient for my purposes. Thanks for your help.
Best Regards,
Drew
–
Drew Gertz
Northwind Engineering OÜ
+372 5565 0147
drew@northwindengineering.com
northwindengineering.com