Quote:
Originally Posted by freebeard
Ten years ago (...on a cold dark night?) I posted this (lower left):
It has a 4-2-1 header that terminates in a reflective shell that expands the tailpipe to the entire wake area (ignore the Beetle fenders  ) Looked at one way, it's a Coanda nozzle that energizes the wake; the other, the wake is sucking on the tail pipe.
Put that 1200CFM of hot, humid exhaust gases to work. |
We're heading off in a new direction here Freebeard but one I am also interested in.
Yes I believe that exhausting in the area of lowest pressure, behind a car at speed, is a no-brainer. (except for laws around this IIRC)
(The 1st Lotus Europas did this, more or less, but sealing the hot vibrating exhaust to a relatively still fiberglass body was impracticable)
Optimizing the shape to better use that vacuum as you have; I like the idea.
Same goes for the engines air intake:
That should be a properly designed bell mouth at the highest pressure area of the car's nose.
Ingested water can be made to settle in the bottom of airbox where flow speed drops dramatically due to the vastly increased 'frontal area' there and then bled off with a small float valve.
Another idea:
For the life of me I cant find the article but basically it was research on a wing where air is sucked into the wing at the trailing edge of the low pressure side and air is blown out at around the point it normally breaks away from the same top surface. (at around the thickest point.
NB that the sucking and blowing was not perpendicular to the surface but more of a slot/step, so the sucking and blowing was parallel to the surface.
The study on this wing showed hard to believe results at insane angles of attack.
IF it works as stated and if one did the same thing in a car by using the engine's exhaust and intake, you would end up with adhered flow on a much shorter tail.
There would also be a fair amount of EGR but unlike std EGR systems; you just cant beat the efficiency of this type of 'heat exchanger..!'
(Perhaps the link is on my other computer. I will look and post again if so)