The aerodynamics is the area of ​​the fluid mechanics dedicated to analyzing the movement of the gases –Especially of the air– and the interactions that these engage with the bodies that move in them.

## Interactions between gases and bodies

Within this framework, aerodynamics studies the forces that affect the elements that move in the gases. It is important to note that when there is a body in the fluid, a change in speeds and pressures of the gas particles, resulting in resistance and lift forces.

Aerodynamics is essential in aircraft design

Knowledge of aerodynamics is often applied to the displacement of an aircraft for him air. As an adjective, in fact, streamlined and aerodynamic refer to the appropriate design to minimize air resistance.

Above all body that moves through the air acts a force that is known as endurance. This force has the opposite sense with respect to speed: that is why it hinders the advance of the body.

## Aerodynamic profile

It should be noted that the Aerodynamic profile of a body is defined according to its shape, when this allows it to take advantage of the forces that originate from changes in pressure and air velocities. A airplaneFor example, you must have an aerodynamic profile suitable for flying.

Another name by which this concept belonging to aeronautics is known is wing profile, although among its professionals it is also common to simply speak of profile. The aerodynamic profile is one of the most relevant points when designing surfaces such as at, the blades (curved vanes of a rotodynamic fluid machine, such as a compressor or turbine) or the rotor blades or propellers like those found in stabilizers and helicopters.

According to the objective of the designers, the profile it can vary in its thickness, in its curvature, in its degree of symmetry and it can also have different values ​​from the beginning to the end of the wing. It is necessary to highlight that not only aircraft have an aerodynamic profile, but this concept can be applied to many bodies that have a shape capable of:

* oppose a certain degree of resistance while moving through a fluid. This point has a direct impact on the difficulty you have to move through this medium;

* produce dynamic forces of varying intensity about himself that combine with your own advancement through the fluid you are in.

## Wind tunnel

A wind tunnel, on the other hand, is one that is used to subject a body to the influence of controlled air currents. They are generally used Models to scale with the aim of knowing the aerodynamic behavior of the object.

As well as the previous concept, this one is also known by another name: wind tunnel. It is a useful research resource for studying how the air affects the objects around which it moves. This is carried out in the context of simulation experiments, so that all necessary adjustments can be made. before moving on to real-world practice.

Birds: Source of Inspiration for Aerodynamics

The normal thing is that the object keep still in the wind tunnel while generating the gas or air stream around it. Its most common application includes spaceships, planes, cars, missiles, bridges and buildings.

The first related experiments date from the early 18th century, when the British engineer Benjamin Robins invented a device that made it possible to test the endurance in the field of aviation. Other fundamental names in the evolution of the wind tunnel throughout history are George cayley, Francis Herbert Wenham and Konstantin Tsiolkovsky.