Airless Spiral Centrifugal Turbine (Gasoline Combustion)

Gasoline combustion version of the impeller turbine, center exhaust gas in, rim out. Designed to have a central axle around the exhaust out center port. Fuel-air mixture can be injected in the center when the input has been covered with the injection ignition plate. When the metal surface is hot, you can just spray gasoline on it, and it will vaporize and combust by itself, fetching air from the smaller center inlet and push it out radially through the blades, spinning the rotor (like in a sauna).

https://www.thingiverse.com/thing:6071241