Quote:
Originally Posted by calfianu
There are too many "IFs" ...
there is THIS out there... and they say it works. There are not chevrons, but it uses the boat tail effect.
On the other hand we have seen THIS
IF they work (and apparently they do), what can we do wrong by talking. You've seen the yellow parts in the picture. They are plastic "Kinder Surprise Egg". Any ideas to test their drags using household stuff ? |
That's a box-cavity behind the mirror.It captures a vortex,allows a pressure rise,reduces the wake,and increase base pressure, while adding length (fineness ratio ).
It's good thinking.
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As to the serrations,again,they don't do anything to increase the base pressure per se,but the shearing forces due to the zig-zag separation line might make for 'mixing' and breaking up larger turbulent eddies into smaller,more homogeneous eddies,which dissipate sooner.
*They could be modeled at 1:1 scale with DNS CFD on a $100,000,000 supercomputer.
*And they could be measured at 1:1 scale in a good wind tunnel,looking each time at total drag for a change.
*I don't have any confidence that we could measure their effects 'at home.'
