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There is a animation about the pneumatic Wankel concept: https://www.youtube.com/watch?v=zuZy_eAnwXo
The hardest part would be to properly seal off the top and bottom gaps. A 0.1 mm high, 30 mm long gap is already a highway for air molecules. Putting a large rubber seal around the entire perimeter would cause too much friction, I am afraid. Food for thought...