Small air separation unit expander outlet diffuser

After the gas flows out of the expander impeller, there is still a certain speed. This part of mechanical energy without work is called residual speed loss. In order to reduce the velocity of the gas flow at the outlet of the expander, there is generally a section of expanding short pipe at the outlet of the expander impeller.

This section of short pipe can reduce the velocity of the air flowing out of the expander impeller, reduce the kinetic energy, convert part of the kinetic energy of the gas flow into pressure energy, and cause the pressure at the outlet of the section of short pipe to increase, so this short pipe is called a diffuser.