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Free rotation of a vertical axis wind turbine
Hi,
I am trying to simulate a vertical axis wind turbine. There is no control script added here. When I try to set the rotation to free rotation, I observe that the rotational speed of the vertical axis wind turbine finally stabilizes at a value, and the acceleration in the rotation direction is near zero. However, at this time, the TSR of the turbine is stable at 3.5, and the aerodynamic torque is positive. What puzzles me is that the rotational freedom of the turbine should only have one end subject to positive aerodynamic torque, which should make it always have an acceleration and continue to accelerate. How is it balanced? Thanks if someone can answer my doubts.
Regards, AsIlll
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Hi AsIlll,
the torque and power values shown in the “Aerodynamic Time Graph” aren’t suitable for this analysis since they’re computed by reprojecting aerodynamic panel forces around the rotor axis. This approach does not consider structural inertia or elasticity forces and is only valid for a massless, rigid structure.
For representative results, you should instead use the data from the “Structural Time Graph.” Specifically, the “Aero. LSS Torque [Nm]” variable provides the actual torque measured at the hub and thus represents the appropriate metric for your needs.
BR,
David
