Rotational force = blade wind receiving area × wind speed pressure × length of torque arm. The rotational force of the nacelle is closely related to the geometric structural parameters of the wind wheel, blade area, wind speed and air density. The higher the wind speed, the larger the blade surface area, and the longer the torque arm, the higher the rotational force, resulting in higher power output. Calculating the rotational force of the nacelle provides an important reference for the selection and design of wind turbines.
How does this 200 meter high wind turbine convert majestic wind into millions of watts of electricity?
First, the windshield turns the propeller and the rotor inside the top of the tower turns the drive shaft. The drive shaft is connected to a gearbox, thus rotating the generator to produce electricity. It is not easy to build such a wind turbine. It starts with the propeller. The difficulty in making a propeller lies in the fact that each blade has a curved surface like that of an airplane. When the wind blows over the blades, it generates an upward force, causing the propeller to rotate. In addition, it must be sufficiently long and light. enough. Therefore, all blades are constructed from one piece of carbon fiber. Carbon fiber is stronger and lighter than steel and allows for longer blades.
Second, use fiberglass to make an aerodynamic shell. First vacuum-pack the fiberglass sheets, then bake them in this cylindrical oven to form two halves of a perfectly homogeneous shell. Anxious to join the two halves of the document, the workers first applied a layer of glue to the inside of the bottom ofe the hull, then also applied it on top of carbon fibers one and two, then carefully dropped the huge 55 meter long car into the correct position. After the blade is installed, the blade must be fired again to allow the adhesive to change. After cooking, remove the combined document. At this time, the surface of the blade is not smooth enough and it needs to be polished with a sand mill. It takes about ten hours to polish each blade.
Third, in nature, the biggest threat to wind turbines is lightning. If lightning strikes a hollow propeller, it will quickly heat the internal air and cause it to expand, causing the blade to collapse. To avoid being struck by lightning, engineers will install copper bridges on the tips of the blades. This will allow the lightning to conduct current to the base of the blade and then to the ground, allowing the lightning to bypass the footprintand protect important elements. generator components. Then we started to install the mini power station on the wind turbine. This is called the nacelle, which is the heart of the generator. The huge reward can generate a lot of twisting force, but it only spins 30 times per minute. slow speed cannot produce electricity, so the gearbox in the generator converts the low speed, high torque rotation of the blades into high speed torque via the drive shaft drives the rotating magnet to the inside the generator. rotates, an electromagnetic field is formed, thus generating an electric current.
Fourth, such a generator can produce 3.5 million watts of electricity, enough to power more than 3,000 homes. Each time the magnet rotates, the anode and cathode exchange, creating an alternating current. The frequency of cathode and anode exchange depends on the custom of the helice rotating, but the power grid requires stable frequency power supply, so this converter is installed in the cabin, which can convert the alternating current generated by different wind speeds into stable current. sent to the power grid at a fixed frequency. The assembled cabin weighs 85 tonnes, which is larger than a double-decker bus. It and other rectangular parts must be transported in batches by truck, and its assembly takes three days after arriving at the installation site. Once assembled, these giant wind turbines will be able to provide the city with the electricity it needs.