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CREATING DOWN FORCE SENSITIVE TO ENGINE SPEED
The aft part of a car underbody is where a rear diffuser is usually located. It works by accelerating the velocity of the airflow underneath the car. At the diffuser exit station, the airflow is at the same pressure and speed as the ambient, since its geometry is expanding the rear region the exit area is much bigger than the inlet, therefore for the conservation of mass principle the airflow will have a much bigger speed at the diffuser inlet and as a consequence on the whole car underbody. The consequence of the increased flow speed is a reduction in pressure according to Bernoulli’s principle. Since the pressure below the car is lower than on the side and above the car, downforce is produced if implemented correctly.