This is how I'm visualizing the air flow above and below tsr 1. Below tsr 1 there should be little air flow through the venturi so that the space in the venturi is at a higher pressure than the space downwind from the wing so, if most of the air is divered around the venturi we would get a low pressure area at the outside of the wing area and downwind producing good starting torque. The area in blue is around where I see the low pressure area.
Above tsr 1 I think we want the air flow to shift into the venturi to increase airspeed in the venturi area to make it the low pressure area. Now we are producing lift on the inside of the wing rather than the outside and the swail or "dent" serves to seperate air flow on the center and create drag rather than lift. The area in blue on the second diagram is a drag area which I think is better than it being a lift area. If there was no swail and the center had a simple delta shape then I think the area in blue would be producing lift which would counter rotation more than drag. Unfortunately I can't see a better way to treat this area so I've settled for drag.
I could easily be mistaken on this but at this time this is my best understanding of what's happening.[ Parent ]
Yes I understand and agree on your visualization, but just before tsr=1 pressure builds up in the venturi and is almost equal to the downside pressure. Pressure builds up because the rotor spines around and the leading site of the venturi gasp air. This means that the wall of wind is there, but it is the last stage before tsr=1. Maybe if you sharpen the swail the rotor exceeds tsr=1 just a bit faster.
You already mentioned "It hard to visualize and consider what going to happen with these things because it's so different for at various rpm and even during a single rotation at various rpm." We need someone who can make a computer simulation for this type of problem.
Did you noticed that we where actually making a sequence movie with our pictures?
