"... Then the heated air needs to be accelerated to the free air stream with as little turbulance as possible."

If I may ask what do you think is the best way to do this?
I subscribe to the 1:1.4 ratio of intake to exhaust. But lately I am thinking that how and where the exit air is blended with the airflow around the plane is just as important.
Do I need the lower air stream to stay attached to the rear of the fuselage? I want to accelerate the heated air, by using the step concept used in float design. By that I mean about venting your hot high temp/pressure air into a high pressure area by creating a relative low pressure zone in a high pressure area, do you think there is any merit to this approach?