Why are the blades of wind turbines used for wind energy production so small[3]

I think it's a weight thing, because if it's bigger and the fan blades are heavier, they will be less likely to be blown away by the wind, so these should be the calculated volume and wind reception area which are most likely to be exploded. Because the fan blades of large-scale wind turbines are relatively large and cannot be compared with those of electric fans, and their weight is relatively heavy. If there are too many blades, the weight will become a brake on rotation.

As for the second question, I think 1 is cost, and 2 is to consider airflow. Maybe if they are close, the wind flow will interfere with each other.

How many kilowatt hours of electricity does wind power produce per revolution?

The reason it is so small is to conform to the principles of aerodynamics. But it's really not small, itSome 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 loss. The blades are one of the highest costs of the entire grinder.wind, 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.

Wind power generates approximately 1.4 kilowatt hours of electricity per cycle.

Take the example of a 1,500 kilowatt wind turbine. The unit's blades are approximately 35 meters long (approximately 12 stories high). Each rotation of the wind turbine takes about 4-5 seconds (but the peak speed of the blades at this time can reach more than 280 kilometers per hour, comparable to the speed of a high-speed train) and can generate about 1, 4 kilowatt hours of electricity. . Under normal full power conditions, one day's electricity generation can be used by 15 families for a year.

Generally speaking, Category 3 winds are valuable for use. However, from aFrom an economic and reasonable point of view, wind speeds above 4 meters per second are suitable for electricity generation. According to measurements, a 55 kilowatt wind turbine has an output power of 55 kilowatts when the wind speed is 9.5 meters per second; when the wind speed is 8 meters per second, the power is 38 kilowatts when the wind speed is 6 meters; per second, the output power of the unit is only 55 kilowatts, which is 16 kilowatts and when the wind speed is 5 meters per second, it is only 9.5 kilowatts.

The principle of wind energy production :

The principle is to convert the kinetic energy of the wind into mechanical kinetic energy, then convert mechanical energy to For electrical kinetic energy, it is wind energy. The principle of wind power generation is to use wind energy to make tturn the wind turbine blades, then use a speed multiplier to increase the rotation speed to encourage the generator to produce electricity.

According to wind turbine technology, electricity production can start at a breeze speed of around three meters per second (the degree of breeze). Wind energy is becoming a craze worldwide because it does not require the use of fuel and does not produce radiation or air pollution.

The devices needed to produce wind energy are called wind turbines. This type of wind turbine can be roughly divided into three parts: the wind wheel (including the tail rudder), the generator, and the tower.

The wind wheel is an important element that converts the kinetic energy of the wind into mechanical energy. It is made up of several blades. When the wind blows towards the blades, an aerodynamic force is generated on the blades tor spin the wind wheel. The blade material requires high strength and light weight and is often made of fiberglass or other composite materials (such as carbon fiber).

The iron tower is the structure that supports the wind wheel, rudder and generator. It is usually built relatively high in order to obtain a greater and more uniform wind force and to have sufficient force. The height of the tower depends on the impact of ground obstacles on wind speed and the diameter of the wind wheel. It is generally between 6 and 20 meters.

The function of the generator is to transfer the constant rotation speed obtained from the wind wheel to the power generation mechanism through increased speed for uniform operation, thereby converting mechanical energy into electrical energy .

Reference for the above content: Baidu Encyclopedia - Wind Energy