Why did the smaller blades work better on my wind turbine?
I made a very small model wind turbine for a science fair project and expected to see that the larger blades worked better, but the results were the complete opposite and overall pretty crazy. I don't know what any of this means. Help?
Best answer:
Answer by billrussell42
Smaller blades allowed a faster speed to be developed. If your generator were geared for those faster speeds, then it would develop more output.
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What do you think? Answer below!
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It all depends on the wind conditions. Dependent on the wind it will determine what wind blades are best. There are multiple ways to alter the wind blades to make them optimal for the conditions (e.g. curved tip, blade twist, thickness, weight, etc.) so it seems the smaller blades were more ideal for the given conditions.
It was probably because your larger wind turbines required too much energy to move, and there wasn’t enough wind energy to induce that movement. The linear momentum required to move the wind blades was greater than the available energy.
Bigger blades will give it more toque but will slow the blades down, because the air will take more time to pass through.
It will also move in low wind areas, the bigger blades will catch more wind.
Small blades can move quicker but needs a fast moving air flow.
It’s probably because the moment of inertia is more distant from the center of the blade. or perhaps the moment of inertia was greater.