I do differ with you on the way to extract the most power. The upwind side has the best air speed and best air flow(lest turblent) and I think should be what the machine is set for. The downwind side only sees the wind after it has been slowed and mixed by the blades passing thru it on the upwind side and by all of the support structure, S rotor etc. This leaves a slowed turblent wind to try and extract power from. Almost everything I have ever read says to try and design for power extraction from the fastest smoothest wind as it has the most power in it V^3. Urban settings normally suffer from the same condition reduced wind speed and turblent flow, with a tall tower usually the only way to find really usable wind.
I had planned on making the angle of attack variable on my machines until I found what I thought worked best so I'll just make sure it adjusts down to 0. How thin/thick my blade is will depend on what size tubing or rod I have to use for the stresses placed upon it. I would rather use the tubing as I expect to shred a few airfoils while looking for the right mix of materials and engineering. If it is going to rain metal out of the sky then I would rather it was tubing than soild steel rod.Texas born and bred[ Parent ]
Ahem, good point. Tony seems unable to distinguish between spinning free and power extraction.
I, too, believe he is just trolling for attention and maybe website hits. The waters here must be fertile. Being a completely open and free resource run by very friendly folks, I guess we have to see it continue. Sad really because I am sure it confuses folks who can't tell fact from fiction.
Cheers.
TomW
Without fools, you could not look intelligent. There is no knowledge without questions.
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Anthony C. IntegEner-Wind Tehachapi, CA (where we have thousands of power producing wind turbines for the utilities and even a few dozen for homeowners and businesses) www.integener.com [ Parent ]
Anthony C. www.integener.com [ Parent ]
Maybe we should give the laws of physics a government check, make them go to a sensitivity camp and put them in government housing. Maybe they will understand then.
Ron Adventure is just bad planning." -- Roald Amundsen [ Parent ]
This blade design was no accident. It was arrived at in maximizing the airflow deflection that results in the blade driving force, otherwise known as "lift", and minimizing the profile drag. The string that can be seen in the corner of the photos was there to keep the rotor from starting up while the photo was taken. Startup is not a problem here and it will even start against a load. Other views I have posted show the blades running at high speeds similar to the small horizontals. It lights the LED lights from its direct coupled axial flux generator. Unlike the Savoniuses, this can be readily scaled up both in blade length and rotor arm diameter. (Only one blade pair is fully assembled while the other three were just hung on their arms for the photo.)
No one has ever claimed that blades like this have been tried anywhere else to my knowledge. Most everyone seems to feel they don't work until they see it start up and run.
Anthony C. www.integener.com[ Parent ]
