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Lenz2 wind tunnel tests are done
electrondady1:
congratulations ed, looks like all your work has been worth while.those seem like very good numbers especially in low winds. how does your machine stack up compared to props or darius types?
your personal wind tunnel should be kind of handy, quick test results on every modification.
pyong:
Hi windstuff
I've been following your progress with interest!!
Well done with the tunnel test, the numbers look good!
2 questions please..
A. What was the sq section size of the tunnel the turbine was placed in?
B. Were tunnel blockages taken into consideration when working the numbers?
Cheers
Pyong
monte350c:
Hi Ed,
Good numbers and a good looking test!
I'm impressed by the performance of the Lenz2 - and equally impressed by the very small error in the measurements in your own tunnel. If nothing else it was worth it to validate your wind tunnel.
Now you can put various designs to the test in your own back yard and be confident in the numbers.
Well done all around.
Ted.
electrondady1:
when you refer to a more efficient alt. are you thinking of a unit that will have a lower cut in speed? some thing that will produce more induced drag(a brake) at higher speeds?just curious as to what design changes you would make when building an alternator specificly for your lens2.
windstuffnow:
Hi Pyong,
The tunnel test section is 3ft tall x 4 ft wide. The professor, Dr. Liu, worked out the details on blockage and these were added to the final calculations. For the most part I watched and learned. They wanted to disassemble the unit and run the wings through a series of lift/drag tests at various wind speeds, I would have loved to let them do it but my budget would only allow the basics.
I did, however, study the balance beam mounted below the unit the wings are attatched to and it appears a smaller less technical ( computer controlled ) balance and measure system could be used for this. I'd like to build one for my tunnel and play with some measurements. The mechanics of the beam is quite simple and as long as everything is balanced the measurements should come out reasonably accurate. Another toy to play with...
.
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