Jannem,the area reduction difference for the 3 port ( or T port ) Vs a single port is due simply to the amount of Blowdown available in relation to
the total effective Ex port area.
The 3 port is capable of WAY more BMEP than a single port and all the extra area is above the transfers.
In the end the ideal velocity in the duct where it flows thru the nozzle is around 0.8 Mach max,higher or lower looses power.
As Frits says, the relationship should be tied to the actual Blowdown capability, and when I get time ( yea right ) I will look at forming some sort of formula for this.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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