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Nacelle Drag

#1 · 6. June 2023, 16:11

Dear all,

I would like to include drag coefficient on the nacelle, as seen in the documentation, it has recently been updated/added to Qblade. However I do not quite understand the difference between the keywords to be used (see picture).

Especially between the center of drag (NACCD) and the three nacelle drag coefficients (NACCD), that seems to be the same. I was wondering if maybe there could be a mistake in the documentation?

Thank you in advance,

Steven

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#2 · 6. June 2023, 17:34

Hi Steven,

yes, you are correct – thats an error in the documentation. I have just updated this part – it should be:

——————————- NACELLE DRAG ——————————
10.0 NACCAX – Downwind distance from the tower-top to the nacelle CD (m) (HAWT only)
0.0 NACCAY – Lateral distance from the tower-top to the nacelle CD (m) (HAWT only)
1.75 NACCAZ – Vertical distance from the tower-top to the nacelle CD (m) (HAWT only)
15 NACARX – Downwind area of the nacelle (m^2) (HAWT only)
90 NACARY – Lateral area of the nacelle (m^2) (HAWT only)
60 NACARZ – Vertical area of the nacelle (m^2) (HAWT only)
1.2 NACCDX – Downwind drag coefficient of the nacelle (-) (HAWT only)
1.2 NACCDY – Lateral drag coefficient of the nacelle (-) (HAWT only)
1.2 NACCDZ – Vertical drag coefficient of the nacelle (-) (HAWT only)

BR,

David

#3 · 7. June 2023, 08:47

Hi David,

Thanks for your feedback.

Steven