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Model scale turbine
Hi,
I am currently trying to implement a scale model wind turbine that is used in a (MARIN) basin. I have the correct scale model blade geometry with correct airfoils, extrapolated polars, chords and twist angles. However, I now require this wind turbine to run at a constant tip speed ratio.
I am able to design a controller, however this controller should be brought along with a structure file. This induces a lot of uncertainty to my results, as the exact inertia, mass, bending stiffness, torsional stiffness etc. at each blade section are only available for the full scale turbine (the model scale is “fruda” scaled down). Is there another simplified way to set a constant RPM, as I am only interested in aerodynamic results from a variety of custom wind fields. these wind fields include turbulence. The rotational speed settings only fix the rpm, not the TSR, which remains variable in the case of a turbulent windfield. Any suggestions are appreciated.
Regards, Emiel
Hi Emiel,
I dont fully understand what you mean by:
I am able to design a controller, however this controller should be brought along with a structure file.
You should be able to design a controller based on the turbine definition that you setup in QBlade as all of that structural information is readily available.
Otherwise, you could also use the SIL for the purpose of running at a constant TSR: At every timestep you can call the SIL function getWindspeed() to sample the windspeed at some locations around the rotor and then call setRPM_at_num(), to adjust the rotational speed so that the turbine runs at the desired TSR.
BR,
David
