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VAWT power lower than expected
Hi
I’m generating a VAWT with an airfoil NACA4418, and the power I’m getting in the multi-DMS section is lower than I calculated it would be. The swept area of the turbine is o.21m^2, and I’ve attached a screenshot of all the other input parameters. From using the max power available equation, I thought the max power for 200 RPM should be about 10.29W, but I’m getting a max of just under 2W. I’m unsure what I’m doing wrong and was wondering if there were any suggestions on how to fix this?
thanks
Jess
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Hello Jess,
could the discrepancy be due to your simulation using a fixed pitch angle of 15°?
Other than I cannot tell whats causing the difference.
On a general note, the DMST algorithm is quite unreliable for predicting VAWT performance. I strongly recommend using the LLFVW method in the time domain to ensure consistent results. You may find some relevant discussions on the DMST algorithm in the forum posts linked below:
https://qblade.org/qblade-forum/search/?keywords=DMST
BR,
David
