Where does stagnation pressure rise occur in a centrifugal compressor? Identify the component(s) responsible for the increase in total (stagnation) pressure.

Concept/ApproachThe impeller does shaft work on the fluid, increasing total enthalpy and thus stagnation pressure (neglecting losses). The diffuser primarily converts kinetic energy to static pressure; ideally, total pressure would remain constant there (real diffusers have losses that can decrease stagnation pressure).

ConclusionThe rise in stagnation pressure is produced in the impeller.

Final AnswerIn the impeller only.