To improve the motor fan blades, you can refer to the following aspects:
(1) About the blade material
The blade material should be light and hard. If conditions permit, it is best to use carbon fiber.
Pultruded fiberglass reinforced blades have good durability and corrosion resistance, resist acid, alkali and atmospheric corrosion. They have uniform material, high flexibility, consistent size and standard weight. , smooth surface and other characteristics. Mainly used for: wind turbines, wind water pumps, highway anti-glare signs.
Most rotor blades on large wind turbines are made of glass fiber reinforced plastic (GRP). Using carbon fiber or aramid as reinforcement is another option, but such blades are not economical for large wind turbines. Wood, wood thoxy or epoxy-wood fiber composites are not yet present in the rotor blade market, although there are developments in this area. Steel and aluminum alloys respectively present problems such as weight and metal fatigue. They are currently only used in small wind turbines.
(2) About the structure of the blades
The variables on the blades are:
1. Theoretically, the more there is on the blades, the better, which helps maximize the air in contact with the blades. But this is obviously not possible in practice. If it is too dense, the flow fields between the blades will interfere with each other. If they overlap, it won't be practical. If 3D printing is applied, it can greatly modify the existing design. ideas. If it is too thin, the efficiency will be low.
2. Transverse shape of the blade. Since aircraft design and manufacturing havea long history, investments are large, the industry is developed, and there is a huge amount of aerodynamic data. Currently, aircraft airfoils are commonly used in blade airfoils, such as Göttingen airfoil, L-S airfoil and NACA series. , and high lift airfoil type, etc. Each type of airfoil has its own temperament and scope of application. Domestic and industrial fans do not have this problem. They are straight and can be turned using an iron plate.
3. Installation angle (the angle of inclination of the blade). Simply put, it's about how to maximize the conversion of air into axial flow as the fan blades rotate. For fan blades, the degree of inclination between the blade root and the maximum outer diameter is different, that is, the angle ofinclination of each ray is different.
4. Angle of deviation. That is, the bottom edge of the blade extends in a certain arc shape and does not radiate in a straight line. It can be understood here as the shape of the bottom edge, which can be straight or deviated at different angles; it can be arc-shaped with different curvatures, it can be elliptical, U-shaped or W-shaped; All sorts of strange things.
The most important ones would have to be these four. The complexity lies in the fact that all factors are interdependent. Even the first number of leaves does not determine which specific leaves are best. If the situation changes, everything changes. There are many situations for 2, 3 and 4, which can only be simplified during research, but simplification means giving up many possibilities, so there is huge room for improvement in which the form presents the plus great advantage.
Also, there are other ways to trim leaf tips, add dorsal fins, open teeth at the bottom, etc., etc., etc., but they don't can only be thrown away.
The motor has a small suction, usually a fan motor. The power of the machine is small, and the effect of changing the fan blades is small. If the fan blade angle is changed manually and the change is not precise enough, it can easily cause an imbalance and cause the fan to run at a lower speed. However, it is still necessary to improve the fan blades, because it can improve the operating efficiency of the motor to a certain extent and reduce the waste of electricity.
Not necessarily. Fan power is equal to the product of torque and angular velocity, so high torque does not necessarily have output power.important tie.
The most typical example is the Dutch wind turbine and the now common three-blade wind turbine. If both are the same size, under certain wind speed conditions, the torque of the. The Dutch wind turbine is much larger, but its speed is very slow, so it cannot be used as an electricity generator.