While air is being compressed in a centrifugal flow gas turbine, what happens to the direction of air flow?

Correct Answer: Option C — Changes at each separate component.

Centrifugal compressors force air through a complex path, changing direction at every stage of the process. Air enters axially at the impeller eye, is turned 90 degrees to flow radially through the impeller vanes, and is then redirected through the diffuser and collector scrolls toward the combustion section.