Blade design is based on engine speed.
First determine the speed and power of the generator, then the size of the blades will be determined.
There is a formula for wind power generation: P=?ρ*π*R?*V?*Cp
ρ——air density;< /p>
V—— Wind speed;
Cp - wind energy utilization coefficient
If it's the same generator and you make blades of different sizes, of course, in theory, The generator with a larger blade area can operate at the same wind speed. Spin faster, because the power output P is greater at that time, as you can see in the formula above.
π*R? Here, R is the radius of the blade scanning area.
The principle is that you use the same engine.
Of course, larger blades are not always better, as excessive motor speed will cause heat and damage.
From the point of view of energy saving, this will certainly increase the consumption of cars.
The streamlined body design aims to reduce the wind resistance of the vehicle as much as possible. According to aerodynamics, if you add a protrusion on a profiled surface, this protrusion will definitely increase the wind resistance coefficient of the vehicle. vehicle, that is, the resistance to driving the car increases.
According to the capacity conservation relationship, due to the efficiency problem of the wind turbine, there is mechanical wear and energy loss, so in the principle of receiving the same capacity , the power generated must be less than the resistance received by the car.