Pneumatic turbines are continuous-flow machines, which can be executed in single-stage or dual-stage design.
The conversion of the pressure energy into kinetic energy takes place in the inlet nozzle. On a two-stage turbine, the largest part of the kinetic energy is converted in the 1st turbine wheel. The air-flow is diverted over the stationary turbine wheel. The remaining energy is converted in the 2nd turbine wheel.