Take time t
The volume of wind during this period is V =sh=πrr*vt
Then the mass of this part of the wind is m=ρV=ρπrrvt
The energy of this part of the wind E =0.5mvv=0.5ρπrrvtvv
The power P=E/t=0.5ρπrrvtvv/t=0.5ρπrrvvv
According to the answer, increasing the power is Increase the radius r
Want to make your own wind turbine, how about using the generator and charging system from your car? I use the horn electric fan blades from the factory.
Simple generator can be made into wind power. The cost is less than 10 yuan. Buy a VCD spindle motor at a component store or a place where DVD players are repaired (not a DVD one. The rotation speed is too high and the power generation is not good). The purchase price of the motor does not exceed 3 yuan, and it should be completed within 10 yuan.
After buying the spindle motor, fix the fan blades on its turntable. You can make your own wind leaves from cans. But it must be balanced and the angles are well-proportioned, and don't let it spin unevenly. In advance, connect a 100 ohm resistor to the motor lead and connect it in series with the high-brightness light-emitting diode to form a loop. Be sure to pay attention to the direction of rotation of the motor. Viewed from the turntable, when turning clockwise, the red line is the positive output terminal of the "generator". Adjust the blade angle to make it meet the conditions, and the wind turbine model is completed! It's from the Internet. Just modify it a little, stick the bottom of the can on the motor turntable, adjust the angle of the fan blades, and let the generator rotate clockwise under the wind.
To make a wind turbine from a car generator, the speed of 120 rpm is far from enough. It must at least reach 800 to 1000 rpm to generate electricity. If you don’t modify the generator and want to use it as a wind generator, you have to increase the transmission ratio of the transmission gear. The higher the better. Don’t worry about whether strong wind power generation will burn out the motor, because you are the car’s charging system and the system will automatically adjust. Yes, there will be no problem. You want the car engine to run at least several thousand rpm at high speed, and the generator will have no problem. The only thing you worry about is whether the pneumatic system, support and transmission set you made can withstand the test under strong winds, haha