If the kinetic energy acting on the blades per minute is reduced from 30,000 J to 6,000 J, that is, the kinetic energy acting on the blades per second is reduced from 500 J to 100 J, i.e. the kinetic energy is reduced by 400 J. The energy output is 60 watts, i.e. the electrical energy converted per second is 60 joules. The 60 joules of electrical energy come from 400 joules of kinetic energy. The other part of the reduced kinetic energy is used for. overcome mechanical friction, etc., indicating that the energy conversion efficiency of the wind turbine is 60/400 = 15%.
The relationship between the length of the wind turbine blades and the effective windward area
Convert wind energy into electric energy, according to the law of energy conservation, there a:
The simultaneous solution is: P=
When the wind speed becomes 2 times, the power becomes 2 times So the answer is:
|
The number of wind turbine blades and its wind energy utilization rate
Yes, the area is swept area of the wind wheel.
You actually mean the wind. Doesn't the wheel occupy the entire surface of the circle at the same time? Actually, it doesn't matter. This effect is included in the effectiveness ofth conversion.
The formula for calculating the power of a wind turbine is:
P=cp*(0.5*rho*(v**3)*pi*r*r)< /p>< p >cp is the conversion efficiency 0.2
The calculation shows that r is the blade length l you mentioned is 9.9348 m
The concept of the number of wind turbine blades - the real costs of wind turbines. The ratio between the total surface area of the wind turbine blades (projected in the direction of the wind) and the surface area where the wind passes through the rotor (swept rotor surface) is called solidity (or solidity ratio, volume ratio), and constitutes a reference data for wind turbines. ?
These are several types of horizontal axis wind turbines, with schematic diagrams showing four types of wind turbines: single blade, double blade, three blade and multi blade. The method of calculating solidity. of the wind turbine is as follows: S is each the projected surface of the blades in the direction of the wind, R is the radius of the wheel eolink, B is the number of blades and σ is the realism ratio. σ=BS/πR2.
A wind turbine is an electrical device that converts wind energy into mechanical work, which causes the rotor to rotate and ultimately produces alternating current. Generally speaking, wind energy is also solar energy, so we can also say that a wind turbine is a thermal energy generator that uses the sun as a heat source and the atmosphere as a heat fluid. work.