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A centrifugal compressor raises pressure principally by

  • A.Flinging the air outward so centrifugal effects raise its pressure
  • B.Diffusing the flow in a series of blade rows
  • C.Heating the air in the impeller
  • D.Accelerating the air axially

Answer: A

The radius increase does much of the work, which is why a single stage can achieve a pressure ratio of four or more where an axial stage manages perhaps 1.3. The penalty is a large frontal area and the difficulty of staging such machines in series.

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