Quote:
Originally Posted by maschinenbauer
Hi sort of off topic and maybe covered elsewhere but I saw your pressure map a couple posts up and I am just curious if running your outside vent (fresh air) fan in the car, assuming the air scavenges from beneath the hood at the wipers, would pull enough air from the high pressure zone at the bottom front of the windshield to improve drag more than energy consumed by running the fan?
Thanks!
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The entire front of the car,right up to the windshield header,over the roof,and door sides (depending on the vehicle) is attacking the air and the air is held against the body up to the region where the body reaches it's maximum cross-section.Flow attachment here isn't really an issue.
The horsepower available from the ventilation fan wouldn't even register in comparison to the power of the airstream.Also,you'd want as much air moving outside the car as possible,as internally,it's a torture chamber.
A 'blown',or 'suctioned' slot would do more good at the back of the car,where it could energize an otherwise feeble boundary layer which is at risk of triggering separation