In the wind turbine design class that I took turbines that looked a lot like that were on the list of "scams that people loose money on" a normal three blade prop is getting around 40% of the energy out of the wind, if I remember correctly, so twice the diameter would be more then more then 3 times the area... right there is bad math, I think it was in the high 50's or mid 60% that the wind starts to go around the prop if you try to get to much energy out of it, the same would be true with a set up like this, it would just go around it.
this is not a new idea, it has been done, proven to not work.
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