Quote:
Originally Posted by Viturro
so...in the back of the car we have high pressure air?? the drag is high pressure air?
|
If I'm thinking correctly you are asking about the section of the car/truck body which is typically flat across the rear.
In this case there is no flow of air.
No higher pressure or lower pressure, only a lack of pressure caused by the vehicle body moving though the air.
In part, the rolling vortexes of turbulence at the rear corners, end/top of vehicles are permitted to form because of this lack of pressure.
Had there been pressure back there, air flow could not go crazy and would be forced to conform to a flow, much as it does against the skin of the vehicle body. The body of the vehicle exerts an equal pressure, if it does not, it will flex like fabric does.