hélices

A hélice is a type of rotating airfoil used to generate a flow of fluid, such as air or water, around a central shaft. The hélice is characterized by a series of curved or angled blades mounted on a central axis, which are connected to a rotational drive mechanism. As the hélice rotates, the air or water flows through the curved blades, creating a thrust in the direction of rotation.

Hélices have been used for centuries in various applications, including sailing vessels, windmills, and aircraft propellers. In modern times, hélices continue to be used in a wide range of fields, including marine propulsion, wind energy, and mechanical engineering. They are particularly useful in situations where a high torque or moment of force is required to drive a load.

The basic principle behind the hélice is the conservation of angular momentum. As the hélice rotates, it accelerates the surrounding fluid, resulting in a transfer of momentum. This transfer of momentum creates a reaction force in the opposite direction, resulting in the desired thrust. The effectiveness of a hélice is dependent on several factors, including the angle of attack, the shape of the blades, and the rotational speed of the hélice.

In addition to their thrust-generating capabilities, hélices can also be used as gas turbines, where the rotating blades are used to drive a mechanical load. In this application, the hélice is often referred to as a turbomachine. Overall, hélices remain an important component in a variety of fields, and their continued innovation is expected to play a significant role in future technological advancements.