Quote:
Originally Posted by radioranger
Gotta point there, I guess another way is to duct air from a high pressure area to a lower one, sort of how they cooled the engines in the Shelby Daytona Coupes, cant think of any ordinary cars that do that , probably because of weather issues, I was also wondering if anyone has tried to relocate their mirrors to the door so the air can flow around the windsheild better, maybe sit the mirror out of the main air flow, maybe back a bit , and while ii am thinking about it has anyone ever tried the flaps in front of the rear wheels like SAAB cars used to have,
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1) Ducting high pressure air to a location of low pressure does nothing to mitigate the flow separation responsible for the low pressure to begin with.
2) Air passing through the duct experiences higher skin friction losses than if it were to simply pass 'over' the body, losing valuable kinetic energy to irreversible heating.
3) Air robbed from the front of the car is not available to protect the boundary layer, which itself raises the probability of even worse flow separation, aggravating the pressure drag of flow separation.
4) 'Streamlined' vehicles typically have the least 'porosity' or 'ventilation' of any vehicles.
5) Streamline the vehicle and you'll kill off that low pressure.