Variation of air velocity passing through impeller in centrifugal compressor

Q.  How is the variation of air velocity while passing through impeller followed by diffuser in centrifugal compressor?
- Published on 16 Sep 15

a. Air velocity goes no increasing in impeller followed by diffuser
b. Air velocity goes no decreasing in impeller followed by diffuser
c. Air velocity increases in impeller and then decreases in diffuser
d. Air velocity decreases in impeller and then increases in diffuser

ANSWER: Air velocity increases in impeller and then decreases in diffuser

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    Discussion

  • Pankaj   -Posted on 15 Oct 15



    The high pressure air which is leaving the diffuser is carried through the volute casing to the exit of compressor. A small pressure rise is caused by the increased cross-sectional area with reduction in kinetic energy.

    The velocity of air increases as it passes through the impeller and it decreases in diffuser.

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