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I find this extremely odd. A good rule of thumb is if the flow is inside the object read where the pressures are high and reverse everything.
So in a nozzle pressure against the walls of the nozzle is higher than elsewhere, so if the fluid is on the outside of the nozzle the pressure is lower than elsewhere(because the fluid is expanding and cooling to fill the space).
This design definitely looks like the pressure against the interior of that surface would be high and therefore the rule of thumb says the pressure on the exterior would be a low pressure area(fluid expands to cover new volume cools and pressure drops all at the same time).
I dunno the idea sounds alot like trying to lift yourself by your bootstraps and saying it makes you lighter. . .
I can almost promise you that back window is going to be a low pressure zone, which would be great for someone drafting because the air will pull on their nose to fill the vacuum(or pressure difference).
This smells like the brown's-gas alternator generators. . .
I could be well wrong, but thats my opinion.
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