[unodos96]

Hello, my name is unodos and I have come upon the ecomodder forum from the intersection of aerodynamic efficiency for fuel efficiency and performance based aerodynamics. ( Downforce, drag reduction, etc)

If this type of topic has been discussed please let me know where.

Possibly silly question, not going to be surprised to get clowned on BUT

My question in short form: Could I "tube" airflow from an area of high pressure, say from the front bumper to the rear and it be a "net positive" in drag reduction?

Longform: My car has 2 medium sized holes in the bumper which can technically be sealed up I have often wondered about utilizing this access point. The bumper, this being a FWD car, has preformed ventilation holes at the rear in order to, i assume, release high pressure air build up. Could I create an an air scoop/capture point and tube the air from the front of the bumper to the rear of the vehicle to reduce the low pressure zone that will form in this area.

I realize that there are probably much better ways to do this such as a diffuser, long (boat?) tail, etc but the space is there and it would be a bit less fabrication than those options.

Vehicle for reference: Volvo c30.

Air capture point: The headlight washer cap/containment area. For various reasons mine have broken off and I removed the washer nozzles.

Air release/disposal point: half of the bumper ventilation grills on the left and right of the rear lower bumper section. Image is dark but visible.

Rough idea would be to have no or minimal "scoop" aspect to the capture as not to disturb airflow over the headlights and front of the car. I am hoping that the high pressure formed by the air hitting the headlight and the slight downward angle of this section of the bumper would be enough to A. push air into the "tube" and B. the low pressure of the bumper area would be enough to "suck" the air through.

Little to no scoop is necessary as normally that area would have a very simple and small "cover" as in seen in the front image. A more "traditional" capture spot may be the lower foglight areas on the front but I will consider that if "tubing" air from the front to the rear is viable on its own in theory.

Thank you,
Unodos