Quote:
Originally Posted by JulianEdgar
I am sorry, that doesn't seem to have answered the point that base pressures do not need to be similar to body pressures at the point of separation. Wasn't that what you were saying?
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The base pressure is affected by local pressure along it's entire separation line defining perimeter.
If a portion of that perimeter experiences an excursion upstream ( like over the boot ), due to separation there, or upstream, then that low pressure column of air will be affecting the overall base pressure. And that column of air WILL be affected by the pressure above the separation line creating it.
Since vortex-drag is the highest form of drag, should it also be present, then it will impact the overall drag. It would be manifested in a higher Cd.