Quote:
Originally Posted by Piotrsko
Turbulent is attached? If that's true, gonna have to do some serious rethink.
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1) The flow separation off the steeply-inclined upswept tail is the source of the fuel-robbing drag.( upside down Porsche 911 RS Carrera ).
2) The low core-pressure of the vortices' center of circulation , induced by the VGs, provides a more 'negative pressure gradient, and 'vacuums' the separated TBL back towards the fuselage boundary.
3) With flow attachment reaching further rearwards on the tail boom, there's additional flow deceleration before the flow finally does separate.
4) With additional flow deceleration, we have some additional pressure recovery.
5) That pressure recovery increases base pressure.
6) The increased base pressure reduces the pressure drag.
7) The lower pressure drag allows a lower overall drag, impossible with the larger initial turbulent wake.