Aerodynamic device to be fastened under a vehicle, and vehicle equipped with such an aerodynamic device

An aerodynamic device suitable to be fastened under and to extend downwards from a vehicle having a longitudinal axis, a front face and two side faces, near the vehicle front face, the aerodynamic device comprising:

• one central spoiler having a front wall and two side walls extending rearwards from side ends of the front wall of the central spoiler;
• and
• two lateral spoilers, each lateral spoiler having a front wall as well as an outer side wall and an inner side wall each extending over entire lengths thereof rearwards from side ends of the front wall of the lateral spoiler;
• wherein, in an operative position of the aerodynamic device, the inner side wall of each lateral spoiler substantially faces a corresponding side wall of the central spoiler and forms a channel having a substantially longitudinal axis and having a width along a transverse direction of the channel which decreases from a front end of the channel to a rear end of the channel, so that the channel is capable of canalizing and accelerating air flowing under the vehicle substantially longitudinally from the channel front end towards the rear end of the channel.