Quote:
Originally Posted by freebeard
This leaves the question of how it does work as an exercise.
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No exercise is needed - just look it up.
There are literally hundreds of references that describe the basic operation of a diffuser (eg
https://www.racecar-engineering.com/...-aerodynamics/). More complex explanations add vortex flow.
None of them show backwards airflow or the base pressure communicating under the diffuser.
As far as I can see, Aerohead is taking the misconceptions he applies to flow over the upper rear surface of a car (eg a notchback) and then applying them under the car in an inverted form.