Quote:
Originally Posted by arcosine
I don't know why the square back and notch back are so different, very strange. The blue defiantly had more air flowing, because of the bigger opening.
|
If you take a look at the colored pressure planes behind the cars, I think there may be a clue. The dark blue area, the lowest pressure area, on the notchback is much smaller than on the squareback. It looks to me like the notchback configuration is just barely good enough to see reattachment of the rear flow at the slightly extended trunk surface. That would make the dead air area smaller for the notchback. Scroll down to the point that the color planes for the notchback and the squareback are both visible, one above the other, and you will see the difference. There's lots of information in this paper and it takes a while for it to sink in.
Quote:
|
I don't think this paper applies completely.............
|
They rarely do because the researchers must draw the constrains narrow enough to get it done in the allocated wind tunnel time. Even here, they ran out of time. They just can't cover the general cases. Even Hucho, when he practically owned the VW wind tunnel in the 70' and 80's, had to deal with budget constraints, and production schedules, which limited his use. Takes lots of money to turn on those big fans, even when you own them
