Why are wind turbine blades so small?

Introduction Why are wind turbine blades so small? Finesse must respect aerodynamic principles. But it's really not small, some leaves are fifty or sixty meters long. Large, multiple blades are suitable for low wind speeds

Why are wind turbine blades so small?

Finesse must respect aerodynamic principles. But it's really not small, some leaves are fifty or sixty meters long. Large and multiple blades are suitable for wind turbines with low wind speed and low rotation speed, and their efficiency is low. Wind turbines mainly use low solidity ratio wind turbines with few blades and narrow blades, which can operate with higher efficiency and high speed.

Generally, the height of wind turbines in China is around 65 meters. Blades are the main components of wind power generation. The larger the area swept and the lighter their weight, the more physical electrical energy is generated. In this way, electricity produced More and more.

The larger the surface area of ​​the blade, the greater the strength and it is easy to destroy in a hurricane. And the greater the resistance, the greater the energy lossergy is important. The blades are one of the highest costs of the entire windmill, which can help reduce costs. Assuming that the length of the blade is 34 meters, when the wind is strong, the speed of the blade tip exceeds the speed of sound, causing special air waves.

How many meters are the leaves of wind turbines?

Actually, there are single-blade and two-blade wind turbines. But the most common number of blades in modern wind turbines is three, the result of compromises between various aspects and parameters during the design process. These aspects include, but are not limited to: aerodynamics, energy conversion efficiency, manufacturing and maintenance costs, system reliability, noise and aesthetics.

From a simple analysis of the technical parameters, a larger number of blades can:

(1) Increase the mechanical torque

(2) Increase the powerexit session;

But a greater number of blades will also:

(3) reduce the maximum rotation speed;

(4) result in higher manufacturing costs heavy. Repairs are also more complex and difficult.

Therefore, motors with a large number of blades are more suitable for operation in low-speed locations, such as water pumps and grain grinding motors.

Wind turbines expect the blades to spin at a relatively high speed, so the size of the generator located in the center of the blades (at the top of the tower) does not need to be large to meet the frequency. grid requirements.

In addition, wind speeds generally increase at higher altitudes. As the wind turbine tower is very high, the blades are also very long (40m-60m*). There is a significant difference in wind speed between blades rotating to a high positionand the blades rotating to a low position.

If the generator has only two blades, then when the blades rotate to a high position and a low position, the force exerted on them is obviously not uniform enough, so a tower must be designed stronger and more stable. to hold it in place. Generator and blades. The three-blade generator can alleviate this imbalance to some extent, making it run more smoothly. Smooth means less noise and less wear.

The efficiency of wind turbines in absorbing energy from wind speed is related to the tip speed ratio. A certain top speed ratio must be maintained to achieve higher efficiency. As for the engine, it is already quite efficient and is not the center of attention.

In order to maintain the peak speed ratio, the rotational speed must change in direct proportion to the wind speed. To put it bluntly, shemust be sometimes faster and sometimes slower. It's easier to say it's slow, but it's easy to spin fast and die quickly, so I hope the resistance of the single piece will be higher, so the single piece will have to be wider. The choice is therefore limited to one, two or three pieces. The single coin is unbalanced, while the double coin is theoretically balanced. However, it is difficult to actually make, so we have to choose three parts, which is an economical and feasible compromise.

The leaves of wind power plants measure from 34 meters to 88 meters long. The length of a wind turbine's blades varies depending on the size and model of the wind turbine. Small wind turbines have blade lengths of several meters, while large commercial wind turbines can have blade lengths of several tens of meters. MW) For generators, the length of the blades is between34 and 45 meters, and the corresponding tower height (hub height) is 65 to 100 meters. For a 2 MW wind turbine, the length of the blades is between 48 and 59 meters, and the corresponding height. the height of the hub is between 48 and 59 meters. The height of a 3 MW wind turbine is between 80 and 100 meters and the length of the blades is between 44 and 59 meters. The corresponding hub height is between 80 and 110 meters. The world's largest known wind turbine reached 88 meters, manufactured in a factory in Denmark. Wind power is the process of using wind energy to operate wind turbines and then converting the wind energy into electricity. This clean energy technology is widely used around the world as it helps reduce dependence on fossil fuels and reduces greenhouse gas emissions.

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