How are the blades of a wind turbine determined in size?

Introduction How do you determine the size of the wind turbine blades? Please don’t copy and paste so much. The key is whether the pasted content is relevant. What LZ asked about is the wind turbine blades, and

How are the blades of a wind turbine determined in size?

Please don’t copy and paste so much. The key is whether the pasted content is relevant. LZ is asking about wind turbine blades, not the impeller blades of compressors you mentioned.

The blades of the wind turbine are determined based on factors such as the design rated power of the wind turbine, the rated wind speed of the wind turbine, and the density of the local wind.

If the impeller diameter of a wind turbine is D

Then its swept area S = ∏D^2/4

The area passed through per unit time The mass of the wind, that is, the wind flow rate is Q = ρSV = ρ∏VD^2/4 V is the wind speed

According to the kinetic energy theorem, there is wind power density

P1 = 0.5mV^2 = (ρ∏VD^2/4)V^2/2 = ρ∏D^2*V^2/8

Then there is a wind power coefficient Cp, which is the wind power coefficient Cp obtained by the wind wheel from Ek The percentage of wind energy that can be captured accounts for the total wind energy

Therefore, the theoretical power generation of the wind turbine

P = Cp*P1

Before designing the wind turbine, it is necessary to The design wind speed V and air density ρ can be obtained by long-term observation of the wind speed and air density in the wind field. The design Cp is related to the tip speed ratio, and the optimal value is generally selected. Therefore, the required theoretical diameter of the impeller can be back calculated.

Fan principle, however, in order to have a certain strength, the closer to the root of the fan blade, the thicker it becomes. Made of fiberglass. The reinforcing ribs made of fiberglass are placed in the mold and then injected with resin to form. The small air leaf has a solid structure, and the large one has a hollow structure. The hollow part of the large fan blade is almost half a cylinder. It is not an exaggeration to say that it is based on the principle of an airfoil. The installation angle of the fan blades is generally adjustable. The wind turbine has a complete constant speed device, and a device that automatically brakes, then turns, and finally rotates again when the wind direction changes. Don't do your own research and development. If you want to make a finished product for sale, just buy one and then reverse engineer it. You can search for "Manufacturing Process of FRP Fan Blades".

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