I am working on the design of a 15 kW VAWT.
Are there any formulations for calculating power consumed due to the drag of Struts in a VAWT .???
Does the torque due to Struts contribute to the blade's torque in rotation ?
Thank you,
Bose sumantraa
Hello, The strut on the downwind side will contribute to blade rotation, the strut on the upwind side will oppose blade motion. If you had an Re vs. Cd curve for the strut profile you could find the mean tip velocity and calculate the drag force acting on the strut. The upwind force opposing motion will be greater than the downwind as the upwind apparent velocity is higher. In reality the force acting on the strut is a function of position along the strut as the tip speed varies with distance so you could treat it as a distributed load - find it's equivalent point load and use that in your moment balance equations to determine torque. There may in fact be a general equation one could use, but this is how I've estimated it in the past.
maybe i can help you but need more explanation what you want exactly!
Sumantraa,
A truly "hot topic" in the context of VAWT's ! Plenty of research is reported at ASME and other forums.
Just do a search on Google, and you can collect them all.
-Sanjay
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