Quote:
Originally Posted by freebeard
This is interesting, not only because the granularity of the turbulence is altered as well as it's onset. I wonder if they tried a 4" diameter ring or a 6" diameter circle and so forth. |
The NAVY used a circle and I don't recall that they experimented with different 'sizes.' Ludwig Prandtl used a trip wire ring in the 1920s to get the same results.
With the Reynolds numbers we have for our cars,at 20-mph we don't need a thing for the LBL-to-TBL transition to occur.
Ahmed Feysal reported that the nose of his RAM pickup had a total of 30mm of LBL before it exploded into fully-bloomed TBL.
Years back,BicycleBob remarked on how a spoiler might shatter major turbulence into smaller,more homogenous vortices and eddies.I like that mind picture.
The separation line does look more uniform with the TBL and the wake is remarkably less crenelated ( if that's an appropriate adjective).