I think this was already discussed here Co-Flow Jets - #48 by dougselsam. I see more relationship with suction sail (already discussed here Suction Sails) than rotor. I don’t understand the point of having a cylinder, it is probably suboptimal, it would be more appropriate on a wing, with a flap (a bit like bound4blue, but with blowing).
I don’t really trust results when I see negative Cd without a power coefficient given, it is meaningless.