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DTU poly BEM

Hi everyone,

I am trying to use the latest patch of Qblade software to evaluate the rotor performance. I can see there are 3 corrections model in the simulation. 3D correction and Prandlt Tip loss are in the documentation. But there is no documentation about the last one which is “DTU poly BEM”. Is there any paper describing its principle?

Thank you,

Prem

Hi Prem,

the “DTU Poly BEM” refers to the relationship between the axial indiuction factor and the thrust coefficient that is expressed as a third-order polynomial.

See Equation 2 in the DTU publication:

Implementation of the blade element momentum model on a polar grid and its aeroelastic load impact

BR,

David

Hello.

So what is the difference between having DTU Poly BE clicked or not in a simulation. The Power/windpeed curve is really different with one option and the other

Hi Lobo,

as mentioned before the only difference is in the relationship between the thrust coefficient (Ct) and the axial induction (a_a).

If the DTU Poly-BEM is not selected the standard Glauert correction is used in QBlade.

Many other different corrections exists and it is not uncommon that these do influence the Cp-TSR curves quite a bit, for example see this recent publication by Oliveira et al. which gives a nice overview of this topic.

BR,

David