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cm-history power coefficient in VAWT

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Old   February 14, 2012, 18:43
Default cm-history power coefficient in VAWT
nazareno mancinelli
Join Date: Mar 2009
Location: argentina
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yochule is on a distinguished road
hi people.. i'm facing with a problem with my 2D unsteady simulation of a VAWT.
i'm having this cm-history (fig 1). it's based on the "reference values":
compute from: the bc of the velocity inlet far away of the turbine
area: my VAWT diameter
length: my VAWT radius

you can see that after a lot revolutions i have a accurate convergence for the cm. in the next figure (fig 2) you can see that every peak its like the other one, so i think the solution its converged.

so, i'm not sure how to calculate the power coefficient. if i take the mean of the cm (cmm) and make: cmm*w (w = angular velocity) i have a bad results. what should i do?

kinds regards!
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File Type: jpg fig1.jpg (28.2 KB, 30 views)
File Type: jpg fig2.jpg (20.6 KB, 31 views)
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cm-history, power coefficient, vawt wind turbine energy

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