Quote:
Originally Posted by kach22i
From page 3:
Without spoiler - Page 3
This is not at all what I expected. The wind tunnel smoke images I posted off of your site show the air leaving the surface at the top of the window trim. Air at the middle of the window without the roof spoiler is still attached to at least the middle of the rear window.
100 kph is equal to 62 mph, a more common highway speed in the USA is 72 mph (at least for me). Would the extra 10 mph dramatically alter the tuft results?
EDIT: at the beginning of " vw beetle wool tuft test 2" video, the tufts in the middle of the window seem to wiggle a bit, but are still flat against the glass.
Gerrelt, what level of turbulence if any is this considered? |
I believe that the smoke is the more accurate indicator of the flow.
The air should detach right at the window trim and then crash against the rear of the car so as to allow the engine to harvest it for cooling.
Once the tangent angle on the roofline exceeds 22-degrees(as measured against the horizon)the flow cannot remain attached.
Attached-vortices can hold the tufts against the body but it;s a 'false-signal' when reading only the tufts.
Smoke is the preferred visualization tool.