Aerodynamics behind tires (to add a fairing or leave open?)
http://speedhunters-wp-production.s3...uki-S15-06.jpg
http://speedhunters-wp-production.s3...nt-Aero-14.jpg Was reading an article on A Brilliant View Into Aerodynamics - Speedhunters. It struck me as odd and possibly contradictory that the images actually seem to recommend having an open area right behind the tire (virtually no fairing), as opposed to a fairing directly behind it gradually sloping inwards. Even though, obviously, those designs still push/keep air away from the front and sides of the tires. Any ideas how/why this works or why, in comparison, having a fairing directly behind the wheels may prove better aerodynamically? |
I suppose it could depend on what you are trying to achieve. If you are trying to direct airflow for speed and stability then that may require different parameters that trying to achieve efficiency.
The additions to the roof of this UK Stock Car (I know, different definition here) https://www.stagweb.co.uk/img/activi...carracing3.jpg would do very little on your street car, regarding fuel consumption. It is a case of "horses for courses". |
Sure, but that stock car roof/spoiler seems obviously poised to achieve downforce/stability at the expense of efficiency, just like any other kind of spoiler. Even the airflow image above of the open wheel well seems to show air from the wheel well being directed straight backward and not up to induce downforce, for example.
How would leaving the back of wheel wells open do that or be applied for any reason other than efficiency? |
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All that I do is suggest you look at the original Honda Insight, although they changed this for later years:
http://ecomodder.com/forum/attachmen...1&d=1505838781 |
The opening article hits on one of the topics we have mulled over before.
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What works great cruising at 70 mph to and from work isn't what the track demands and vice versa. That said, I suspect with so many track variables and rule restrictions, they are bound and gagged from doing what we might do. One can often tell when a true aerodynamic designer/engineer is employeed by a race team, the cars start looking girly. I think many race cars suffer from a knicklehead viewpoint, avoiding the more artistic solutions avaliable. The ones brave enough to cast away preconceptions and fear make the disruptive game changers. Then they are copied or get banned by rules to level the playing field. This is the history of racing. |
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http://ecomodder.com/forum/member-fr...gt-one-tm1.jpg http://ecomodder.com/forum/member-fr...gt-one-ms5.jpg I'd like to see this treatment on a VW Beetle with the front axle pushed out 8 inches so the footwell comes to a point. |
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It lets the smoke out. :)
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http://ecomodder.com/forum/member-fr...wu5wo1-500.jpg A radical example of spatted wheels. IIRC the shape was based on the Gerridae aka Water Strider. |
I believe they are trying to vent air pressure from under the car to create a low pressure area with a rear diffuser to suck the car down to the road.
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