This was a concept I did on Nikolai Tesla's famous one-way valve with no moving parts. Tesla's original idea was 2D and planer. This takes the concept and makes it circular.

This is a bit of a work in progress. Even from the original idea max efficiency is about 20-30% so its hard to evaluate if it actually works or not. I think from blowing in it there is a difference. I cut it in half to make it more 3D printer friendly.

CFD shows a 20% efficiency difference between out versus in. If this gets any interest I'll post the visualizations.