- Principe de fonctionnement d'un avion
- L'aile d'avion
- CX, CZ, et polaire de l'aile
In this work, we wanted to understand how an airplane wing and study the influence of the airfoil on the flight. We therefore exposed the physical and mathematical knowledge that we have blies required to address this problem. We thus needed to understand and rewrite data from books or the Internet, and sometimes exceed certain simplistic prejudices such as the "equal transit time".
The experiments we have conducted, they illustrate Bernoulli's Principle or those of the Palais de la Découverte, allowed us to better understand the physics of the problem. We also filmed all these experiences and the DVD is available.
We have identified a set of geometric or aerodynamic factors that influence lift and drag, thus the flight of the aircraft, namely: the same profile of the wing's angle of impact, speed aircraft, the wing surface (and surface condition), the length of the string (via the Reynolds number), the elongation of the wing (around the problem of vortices ).
Moreover, to make the process more successful, it is possible to conduct a study of wing profiles on a specific case. For this, some common patterns can be selected with their associated polar. Taking for example the characteristics of a light aircraft from Cessna, in terms of mass, speed, and size, the polars of these profiles then used to extract information on lift, drag, or the finesse. On the basis of criteria of minimum drag in cruise flight, the maximum fine and maximum lift, it is possible to show that certain profiles are more suitable than others in this plane.
Finally, we wish to thank our teachers for their support during this work.