Quote:
Originally Posted by BeatUpRanger
Oops, my bad. I thought you were talking about the first graphic not the second one. But just to ask for clarity as I'm still learning this stuff, when the air speed slows down, doesn't the pressure increase. So if fast moving air (low pressure) slows down because of the diffusers at the back, doesn't the pressure increase?
I thought that's what they were illustrating.
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*If the diffuser angle is within the 2.5-4 degree upsweep,prescribed for diffusers,based on their point of 'origin',the air will remain attached as the air 'climbs' away from the road surface.
*As this air expands into the larger void,it will simultaneously decelerate and gain static pressure,raising the base pressure of the wake,cutting drag.
*If the diffuser angle exceeds the prescribed angles for attached flow,the air will immediately separate at the beginning of the diffuser,and the wake will do a 'reach-around',with it's low pressure communicating beneath the diffuser and acting upon its surface to create downforce,with a drag penalty to the car.
*If suction is applied to a perforated diffuser,as Ferrari is currently doing,the air can be made to follow a steeper ramp angle and burst into the wake region.