Almost all engineering marvel wind turbines are designed with three blades. So why choose three wings instead of two or four?
The blades, which rotate the rotor shaft of the generator by moving with the power of the wind, convert the kinetic energy of the air into mechanical energy and then into the mechanical energy. to electrical energy it transforms.
The three-bladed design is very important in increasing energy efficiency. Besides the efficiency cost, low noise level and durability factors are also taken into account.
One side of the wings is straight, the other side is curved outward.
They have a structure similar to airplane wings. This aerodynamic design Thanks to the wind, the wind moves faster by recording a longer distance in the curved part of the wing. The pressure on the curved side is greater than on the straight side, which increases the force and allows the blades to turn better.
These systems create the necessary torque for electricity generation with every 120 degree rotation.
If there are more than three wings, more wind will hit the wings, but It has no effect on the number of turns. As the number increases, each wing blocks the wind of the wing below it. Since it will cause the rotation speed to slow down, electricity production will also be less. This reduces energy efficiency.
If many wings are inefficient, then why not one wing or two wings?
If there was only one wing, a faster turn would be achieved, but this balance and noise would cause problems.
Two blades are actually more efficient, but these turbines require special shock absorbers and a specially designed hub to maintain balance and generate electricity. This situation because it increases the cost not preferred.
It is also important to choose an odd number rather than an even number.
If there are even numbers, one of the wings is at the top and one is at the bottom during the turn. (in line with the mast of the turbine) is found. In such a case, more wind force is applied to the upper wing than the lower wing.
Because the foot of the wind turbine negatively affects the movement of the air around the lower blade. The wings move back and forth in the vertical position. would upset the balance of the turbine. When there is an odd number, balance is achieved as in a wheel.
In summary; thanks to the three-wing design energy efficiency, durability, balance, noise level is made most efficient.
Sources: TUBITAK, Engineer
RELATED NEWS