The diffuser has various forms and uses. The aim is to "diffuse" the high molecular concentration of substances to the low molecular weight of the site or medium, the principle of most of the liquid/hydrodynamics principle
The diffuser mainly utilizes the principle of the fluid velocity and the pressure inversely, the airflow of the bottom of the racing chassis is sorted out quickly, which increases the speed of the lower airflow of the car chassis, thus forming the low-pressure zone to enhance the effect of the car under pressure.
The simple image of the understanding is the rapid diffusion of air to export, speed up airflow flow. The higher the airflow velocity, the smaller the air pressure perpendicular to the airflow. The device is loaded at the bottom of the car, so that the air pressure above the bottom of the air flow pressure, resulting in a pressure difference, so that the car produces a pressure on the ground direction, that is, the so-called increase under pressure, so that the car tires have a good grip.
F1 Racing Team Ferrari's racing 248f uses a two-tiered central diffuser from F2005, with a forward-leaning wing piece that divides the central diffuser into the upper and lower parts. It is said that the advantage of this is that it can improve the efficiency of the diffuser when the car is in a low-speed state to get enough under pressure.