Forum

Please or Register to create posts and topics.

Vawt , additional DOF for rotor blades

Hi all .

Is it possible to control the overall blade geometry to keep the blade cord on a constant heading in relation to the wind direction?

I’m not sure if this is built in or if I need to bodge something like making the whole blade an active component, or is there a joint I can control with a turbine controller?

Hi,

when setting up a structural model of a VAWT “pitch actuator nodes” are added automatically. It is then possible to pitch the blades dynamically in two ways:

  1. Use a simulation input file to prescibe how the blade pitch angle changes as a function of time.
  2. Use the controller interface to load a controller library that changes the pitch angle based on the turbine operational parameters.

When you are simulating only an aerodynamic definition of a VAWT (without a structural model) controller cannot be loaded and you can only use option 1.

BR,

David

Thanks very much for the concise reply. I’ll try those methods

Quote from David on 24. September 2022, 13:43

Hi,

when setting up a structural model of a VAWT “pitch actuator nodes” are added automatically. It is then possible to pitch the blades dynamically in two ways:

  1. Use a simulation input file to prescibe how the blade pitch angle changes as a function of time.
  2. Use the controller interface to load a controller library that changes the pitch angle based on the turbine operational parameters.

When you are simulating only an aerodynamic definition of a VAWT (without a structural model) controller cannot be loaded and you can only use option 1.

BR,

David

Could you upload such a simulation input file, because the link you refer to, does not appear in qblade (latest), since a VAWT doe not have a uniform pitching mechanism (unless it is only that that can be achieved with qblade), each blade should have it’s own optimum pitching. Also we don’t see those pitch actuator nodes, nor their position, mentioned?

Thx

Johan

Hi Johan,

when setting up a structural model for a VAWT, pitch nodes are automatically added at all interconnections between blades and struts. When a pitch signal is then transmitted (through a controller or a simulation input file) all pitch nodes that belong to the adressed blade are rotated to pitch the blade around its axis. This really only makes sense for straight blades, but in principal also works for curved blades. So you could try out this feature with the SANDIA 34m template thats available in the download section.

BR,

David