7-color small windmill

Scientific revelation

   windmills, also known as wind turbines, are power machines that do not require fuel and use wind as their energy source. The ancient windmills developed from sails. They had 6 to 8 awnings similar to those of sailboats, distributed around a vertical axis. When the wind blew, they rotated around the axis like a lantern, which was called a lantern windmill. Due to its relatively low efficiency, this type of windmill has gradually been replaced by wooden covered windmills with horizontal rotating shafts and other types of windmills, such as "vertical windmills" and "automatic rotor windmills". More than 2,000 years ago, countries such as China, Babylon and Persia had already been using ancient windmills to carry water for irrigation and grind grains. After the 12th century, windmills developed rapidly in Europe. Through windmills (wind engines), wind energy was utilized for water lifting, heating, cooling, shipping, power generation, and other purposes.

Scientific principle

The fixed shape of the windmill blades (one side higher and the other lower than the direction of the wind) can cause the wind to blow in one direction on the surface of the blades (from high to low), thereby changing the direction of the passing wind. If a turning force is given to the wind, then the wind also exerts a force in the opposite direction on the fan blades, that is, the wind also exerts a counterforce on the fixed switch fan blades. The wind blades are fixed on the shaft of the wind turbine, so the force exerted by the wind on the blades is converted into the shear stress of the wind turbine through the fixed blades, which is why the wind turbine rotates. So the stronger the wind, the greater the turning force exerted by the wind blades on the wind. Correspondingly, the greater the turning force exerted by the wind on the windmill, the faster the windmill rotates.

Scientific production

1. Recognize and prepare the materials needed for the experiment.

2. Install in sequence according to the steps in the manual.

3. After installation is completed, proceed with debugging.

Science Expansion

The principle of wind power generation is to use wind to drive the rotation of wind turbine blades, and then increase the rotational speed through a speed increaser to drive the generator to produce electricity. Based on current wind turbine technology, a gentle breeze speed of approximately three meters per second (the intensity of the breeze) is sufficient to start generating electricity. Wind power generation is creating a craze around the world. There is no fuel problem for wind power generation, nor does it produce radiation or air pollution. Wind power generation is very popular in countries such as Finland and Denmark. Our country is also vigorously promoting it in the western regions. The small-scale wind power generation system is highly efficient, but it is not composed of just one generator head. Instead, it is a small system with a certain technological content: wind turbine + charger + digital inverter. A wind turbine is composed of a head, a rotating body, a tail fin and blades. Each part is very important. The functions of each part are as follows: The blades are used to receive wind power and convert it into electrical energy through the head of the machine; The tail fin keeps the blades always facing the direction of the incoming wind to obtain the maximum wind energy. The rotating body enables the nose to rotate flexibly to achieve the function of adjusting the direction of the tail fin. The rotor of the machine head is a permanent magnet, and the stator winding cuts the magnetic field lines to generate electrical energy. Due to the unstable air volume of wind turbines, the output of alternating current varies from 13 to 25 volts. It needs to be rectified by a charger and then charged to the battery to convert the electrical energy generated by the wind turbine into chemical energy. Then, an inverter power supply with a protection circuit should be used to convert the chemical energy in the battery into AC 220V mains power to ensure stable operation.