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Re: Wind tower design

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        Non circular shapes are also subject to vortex shedding.  What you need is a non prismatic, or tapered, section, or some type of spoilers.
H. Daryl Richardson
----- Original Message -----
Sent: Monday, November 19, 2007 10:53 AM
Subject: Re: Wind tower design

Thanks for the feedback Harold,
I am looking at the probability of wind tunnel testing, as well as theoretical studies to determine the dynamic properties. 
I will be asking the wind experts about vortex shedding.  I will probably be using a non-circular cross-section to reduce the vortex shedding, but I don't yet know if a hexagonal or pentagonal shape is better than circular.  I believe the best would be pentagonal, but that will be a discussion with the wind tunnel people.


On Nov 19, 2007 12:17 PM, Harold Sprague <spraguehope(--nospam--at)> wrote:
I doubt that you will find any sort of code or design guide on this topic.  I would suggest that a wind tunnel study be conducted especially if this is for operational wind load characteristics.  If this is for extreme wind effects, I would think that the dominate issue will be the vortex shedding on the mast. 

Harold Sprague

Date: Fri, 16 Nov 2007 22:02:19 -0500
From: kbofoz(--nospam--at)
To: seaint(--nospam--at)
Subject: Wind tower design

Has anybody done any wind tower design work ?  I am doing some preliminary work on a concrete tower design, and I am thinking about the dynamic behaviour
and the effect of the passage of the blade when it passes in front of the tower.  Does anyone have any information or ideas on this ?

The Germans and the Japanese have actually built some concrete towers already.  Apparently steel towers are at about their height limit now, and the way to greater efficiency and bigger turbines leads to higher towers, which will probably be in concrete.

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